Commission Implementing Regulation (EU) 2016/1185 of 20 July 2016 amending Implementing Regulation (EU) No 923/2012 as regards the update and completion of the common rules of the air and operational provisions regarding services and procedures in air navigation (SERA Part C) and repealing Regulation (EC) No 730/2006 (Text with EEA relevance)

21.7.2016	EN	Official Journal of the European Union	L 196/3

THE EUROPEAN COMMISSION,

Having regard to the Treaty on the Functioning of the European Union,

Having regard to Regulation (EC) No 551/2004 of the European Parliament and of the Council of 10 March 2004 on the organisation and use of the airspace in the single European sky ¹, and in particular Article 4 thereof,

Having regard to Regulation (EC) No 216/2008 of the European Parliament and of the Council of 20 February 2008 on common rules in the field of civil aviation and establishing a European Aviation Safety Agency and repealing Council Directive 91/670/EEC, Regulation (EC) No 1592/2002 and Directive 2004/36/EC ², and in particular Article 8b(6) thereof,

Whereas:

• (1) Article 4 of Regulation (EC) No 551/2004 requires the Commission to adopt implementing rules on rules of the air and on the uniform application of airspace classification. The Union's rules of the air have been developed in two phases. In Phase I (SERA Part A), the Commission, supported by Eurocontrol, the European Aviation Safety Agency (‘Agency’) and the International Civil Aviation Organisation (‘ICAO’), prepared the transposition into Union law of Annex 2 to the Convention on International Civil Aviation (‘Chicago Convention’). In Phase II (SERA Part B), the relevant provisions from Annexes 3 and 11 to the Chicago Convention have been transposed into Union law. The outcome was Commission Implementing Regulation (EU) No 923/2012 ³, combining both those Parts A and B in one Union act.

• (2) Implementing Regulation (EU) No 923/2012 should now be completed by including in it the remaining relevant ICAO provisions, in particular those set out in Annex 10 to the Chicago Convention and in Document 4444 (PANS-ATM), which have a rules of the air-nature and which have not yet been transposed into Union law.

• (3) The provisions contained in this Regulation, should support and complement rules related to the provision of air traffic services contained in Annex 10 Volume II and Annex 11 to the Chicago Convention, ICAO Doc. 4444 (PANS-ATM) and the Common Requirements established in accordance with Article 8b of Regulation (EC) No 216/2008, to ensure consistency of service provision with actions of pilots and other actors under this Regulation

• (4) Implementing Regulation (EU) No 923/2012 should also be aligned with Commission Regulations (EU) No 965/2012 ⁴ and (EU) No 139/2014 ⁵, in order to ensure a consistent approach to regulating civil aviation safety.

• (5) For the same reason, and in order to ensure a more user-friendly presentation of the applicable rules, the rules set out in Commission Regulation (EC) No 730/2006 ⁶ should be inserted in Implementing Regulation (EU) No 923/2012.

• (6) Therefore, Implementing Regulation (EU) No 923/2012 should be amended accordingly and Regulation (EC) No 730/2006 should be repealed.

• (7) Sufficient transition time should be provided for Member States, aircraft operators, air navigation service providers and other interested parties to be able to correctly implement this Regulation, including the necessary publication of new procedures and the training of operators and affected staff. However, the provisions of this Regulation containing urgent amendments of Implementing Regulation (EU) No 923/2012 in light of recent amendments of Annexes 2 and 11 to the Chicago Convention or lessons learned from the implementation of Regulation (EU) No 923/2012 should apply already from an appropriate earlier date, taking into account the system of aeronautical information regulation and control ‘AIRAC’ notification dates.

• (8) The measures provided for in this Regulation are based on the opinion issued by the Agency in accordance with Articles 17(2)(b) and 19(1) of Regulation (EC) No 216/2008.

• (9) The measures provided for in this Regulation are in accordance with the opinion of the Single Sky Committee, established by Article 5 of Regulation (EC) No 549/2004 of the European Parliament and of the Council ⁷,

HAS ADOPTED THIS REGULATION:

Article 1

Implementing Regulation (EU) No 923/2012 is amended as follows:

• (1) Article 1 is amended as follows:

• (a) paragraph 3 is replaced by the following:

‘3.   This Regulation shall also apply to the competent authorities of the Member States, air navigation service providers, aerodrome operators and ground personnel engaged in aircraft operations.’;

• (b) the following paragraph 4 is added:

‘4.   This Regulation shall not apply to model aircraft and toy aircraft. However, Member States shall ensure that national rules are established to ensure that model aircraft and toy aircraft are operated in such a manner as to minimise hazards related to civil aviation safety, to persons, property or other aircraft.’.

• (2) Article 2 is amended as follows:

• (a) point 2 is deleted;

• (b) point 25 is replaced by the following:

• ‘25. “air-taxiing” means movement of a helicopter/vertical take-off and landing (VTOL) above the surface of an aerodrome, normally in ground effect and at a ground speed normally less than 37 km/h (20 kts);’;

• (c) point 27 and 28 are replaced by the following:

• ‘27. “air traffic advisory service” means a service provided within advisory airspace to ensure separation, in so far as practical, between aircraft which are operating on instrument flight rules (IFR) flight plans;

• 1. “air traffic control (ATC) clearance” means authorisation for an aircraft to proceed under conditions specified by an air traffic control unit;’;

• (d) points 33, 34, and 35 are replaced by the following:

• ‘33. “air traffic services (ATS) airspaces” mean airspaces of defined dimensions, alphabetically designated, within which specific types of flights may operate and for which air traffic services and rules of operation are specified;

• 1. “air traffic services (ATS) reporting office (ARO)” means a unit established for the purpose of receiving reports concerning air traffic services and flight plans submitted before departure;

• 1. “air traffic services (ATS) unit” means a generic term meaning, variously, air traffic control unit, flight information centre, aerodrome flight information service unit or air traffic services reporting office;’;

• (e) the following point 34a is inserted:

• ‘34a. “air traffic services (ATS) surveillance service” means a service provided directly by means of an ATS surveillance system;’;

• (f) point 38 is replaced by the following:

• ‘38. “alternate aerodrome” means an aerodrome to which an aircraft may proceed when it becomes either impossible or inadvisable to proceed to or to land at the aerodrome of intended landing, where the necessary services and facilities are available, where aircraft performance requirements can be met and which is operational at the expected time of use. Alternate aerodromes include the following:

(a) take-off alternate: an alternate aerodrome at which an aircraft would be able to land should this become necessary shortly after take-off and it is not possible to use the aerodrome of departure;

(b) en-route alternate: an alternate aerodrome at which an aircraft would be able to land in the event that a diversion becomes necessary while en route;

(c) destination alternate: an alternate aerodrome at which an aircraft would be able to land should it become either impossible or inadvisable to land at the aerodrome of intended landing;’;

• (g) the following point 48a is inserted:

• ‘48a. “automatic dependent surveillance — contract (ADS-C) agreement” means a reporting plan which establishes the conditions of ADS-C data reporting (i.e. data required by the air traffic services unit and frequency of ADS-C reports which have to be agreed to, prior to using ADS-C in the provision of air traffic services);’;

• (h) point 71 is replaced by the following:

• ‘71. “estimated time of arrival (ETA)” means for IFR flights, the time at which it is estimated that the aircraft will arrive over that designated point, defined by reference to navigation aids, from which it is intended that an instrument approach procedure will be commenced, or, if no navigation aid is associated with the aerodrome, the time at which the aircraft will arrive over the aerodrome. For visual flight rules (VFR) flights, the time at which it is estimated that the aircraft will arrive over the aerodrome;’;

• (i) the following point 89a is inserted:

• ‘89a. “instrument approach operation” means an approach and landing using instruments for navigation guidance based on an instrument approach procedure. There are two methods for executing instrument approach operations:

• (a) a two-dimensional (2D) instrument approach operation, using lateral navigation guidance only; and

• (b) a three-dimensional (3D) instrument approach operation, using both lateral and vertical navigation guidance.’;

• (j) points (a), (b) and (c) of point 90 are replaced by the following:

• ‘(a) non-precision approach (NPA) procedure. An instrument approach procedure designed for 2D instrument approach operations Type A.

• (b) approach procedure with vertical guidance (APV). A performance-based navigation (PBN) instrument approach procedure designed for 3D instrument approach operations Type A.

• (c) precision approach (PA) procedure. An instrument approach procedure based on navigation systems (ILS, MLS, GLS and SBAS Cat I) designed for 3D instrument approach operations Type A or B;’;

• (k) the following point 94a is inserted:

• ‘94a. “minimum fuel” means a term used to describe a situation in which an aircraft's fuel supply has reached a state where the flight is committed to land at a specific aerodrome and no additional delay can be accepted;’;

• (l) the following points 95a and 95b are inserted:

• ‘95a. “model aircraft” means an unmanned aircraft, other than toy aircraft, having an operating mass not exceeding limits prescribed by the competent authority, that is capable of sustained flight in the atmosphere and that is used exclusively for display or recreational activities;

95b. “mountainous area” means an area of changing terrain profile where the changes of terrain elevation exceed 900 m (3 000 ft) within a distance of 18,5 km (10,0 NM);’;

• (m) point 114 is replaced by the following:

• ‘114. “runway-holding position” means a designated position intended to protect a runway, an obstacle limitation surface, or an instrument landing system (ILS)/microwave landing system (MLS) critical/sensitive area at which taxiing aircraft and vehicles are to stop and hold, unless otherwise authorised by the aerodrome control tower;’;

• (n) point 116 is replaced by the following:

• ‘116. “safety-sensitive personnel” means persons who might endanger aviation safety if they perform their duties and functions improperly, including crew members, aircraft maintenance personnel, aerodrome operations personnel, rescue, fire-fighting and maintenance personnel, personnel allowed unescorted access to the movement area and air traffic controllers;’;

• (o) the following point 129a is inserted:

• ‘129a. “toy aircraft” means an unmanned aircraft designed or intended for use, whether or not exclusively, in play by children under 14 years of age;’.

• (3) Article 4 is amended as follows:

• (a) in paragraph 1, the introductory phrase is replaced by the following:

‘1.   The competent authorities may, either on their own initiative or based on applications by the entities concerned, grant exemptions to individual entities or to categories of entities from any of the requirements of this Regulation for the following activities of public interest and for the training necessary to carry out those activities safely:’;

• (b) in paragraph 3, the following subparagraph is inserted at the end of that paragraph:

‘This Article shall also be without prejudice to helicopter operating minima contained in the specific approvals granted by the competent authority, pursuant to Annex V to Commission Regulation (EU) No 965/2012[^ntr*1-L_2016196EN.01000301-E0008].

[^ntr*1-L_2016196EN.01000301-E0008]: Commission Regulation (EU) No 965/2012 of 5 October 2012 laying down technical requirements and administrative procedures related to air operations pursuant to Regulation (EC) No 216/2008 of the European Parliament and of the Council (OJ L 296, 25.10.2012, p. 1).’;"

• (4) The Annex is amended in accordance with the Annex to this Regulation.

Article 2

Regulation (EC) No 730/2006 is repealed.

Article 3

This Regulation shall enter into force on the twentieth day following that of its publication in the Official Journal of the European Union.

It shall apply from 12 October 2017.

However, the following provisions shall apply from 18 August 2016:

• (1) Article 1(1);

• (2) Article 1(2)(f), (i), (j), (l) and (o);

• (3) Article 1(3);

• (4) Article 2;

• (5) points (1), (2), (3), (4), (5), (6), (8) (12), (13), (15), (16), (19), (21), (22), (26)(b), (26)(c), (27) and (28) of the Annex.

This Regulation shall be binding in its entirety and directly applicable in all Member States.

Done at Brussels, 20 July 2016.

For the Commission

The President

Jean-Claude JUNCKER

ANNEX

The Annex of Implementing Regulation (EU) No 923/2012 is amended as follows:

• (1) point SERA.2001 is replaced by the following:

‘SERA.2001   Subject

Without prejudice to SERA.1001 above, this annex addresses, in accordance with Article 1, in particular airspace users and aircraft:

• (a) operating into, within or out of the Union;

• (b) bearing the nationality and registration marks of a Member State of the Union, and operating in any airspace to the extent that they do not conflict with the rules published by the State having jurisdiction over the territory overflown.

This annex addresses also the actions of the Competent Authorities of the Member States, Air Navigation Service Providers (ANSP), aerodrome operators and the relevant ground personnel engaged in aircraft operations.’;

• (2) point SERA.3215(a) is amended as follows:

• (a) point (2) is replaced by the following:

• ‘(2) except for balloons, navigation lights intended to indicate the relative path of the aircraft to an observer. Other lights shall not be displayed if they are likely to be mistaken for these lights.’;

• (b) point (3) is deleted;

• (3) in point SERA.4001(d), the introductory phrase is replaced by the following:

‘Unless a shorter period of time has been prescribed by the competent authority for domestic VFR flights, a flight plan for any flight planned to operate across international borders or to be provided with air traffic control service or air traffic advisory service shall be submitted at least 60 minutes before departure, or, if submitted during flight, at a time which will ensure its receipt by the appropriate ATS unit at least 10 minutes before the aircraft is estimated to reach:’;

• (4) in point SERA.5001, Table S5-1, the footnote (***) to the table, point (b) is replaced by the following:

• ‘(b) helicopters may be permitted to operate in less than 1 500 m but not less than 800 m flight visibility, if manoeuvred at a speed that will give adequate opportunity to observe other traffic or any obstacles in time to avoid collision.’;

• (5) point SERA.5005 is amended as follows:

• (a) point (c) is amended as follows:

• (i) points (3)(ii) and (3)(iii) are replaced by the following:

• ‘(ii) the reduced flight visibility provisions specified in Table S5-1(a) and (b) shall not apply;

• (iii) in airspace classes B, C, D, E, F and G, at and below 900 m (3 000 ft) AMSL or 300 m (1 000 ft) above terrain, whichever is the higher, the pilot shall maintain continuous sight of the surface; and’;

• (ii) point (3)(iv) is deleted;

• (iii) point (3)(v) is replaced by the following:

• ‘(v) for mountainous area, higher VMC visibility and distance from cloud minima may be prescribed by the competent authority;’;

• (iv) point (4) is deleted;

• (b) point (d) is replaced by the following:

• ‘(d) VFR flights shall not be operated:

• (1) at transonic and supersonic speeds unless authorised by the competent authority;

• (2) above FL 195. Exceptions to this requirement are the following:

• (i) an airspace reservation has been established, where practical, by the Member States, in which VFR flights may be allowed; or

• (ii) airspace up to and including flight level 285, when VFR traffic in that airspace has been authorised by the responsible ATS unit in accordance with the authorisation procedures established by the Member States and published in the relevant aeronautical information publication.’;

• (6) point SERA.5010 is replaced by the following:

‘Special VFR flights may be authorised to operate within a control zone, subject to an ATC clearance. Except when permitted by the competent authority for helicopters in special cases such as, but not limited to, police, medical, search and rescue operations and fire-fighting flights, the following additional conditions shall be applied:

• (a) such special VFR flights may be conducted during day only, unless otherwise permitted by the competent authority;

• (b) by the pilot:

• (1) clear of cloud and with the surface in sight;

• (2) the flight visibility is not less than 1 500 m or, for helicopters, not less than 800 m;

• (3) fly at a speed of 140 kts IAS or less to give adequate opportunity to observe other traffic and any obstacles in time to avoid a collision; and

• (c) an air traffic control unit shall not issue a special VFR clearance to aircraft to take off or land at an aerodrome within a control zone, or enter the aerodrome traffic zone or aerodrome traffic circuit when the reported meteorological conditions at that aerodrome are below the following minima:

• (1) the ground visibility is less than 1 500 m or, for helicopters, less than 800 m;

• (2) the ceiling is less than 180 m (600 ft).’;

• (7) in point SERA.5015(c), the following point (3) is added:

• ‘(3) Change from IFR flight to VFR flight shall only be acceptable when a message initiated by the pilot-in-command containing the specific expression ‘CANCELLING MY IFR FLIGHT’, together with the changes, if any, to be made to the current flight plan, is received by an ATS unit. No invitation to change from IFR flight to VFR flight shall be made by ATS either directly or by inference.’;

• (8) point SERA.6001 is replaced by the following:

‘SERA.6001   Classification of airspaces

• (a) Member States shall designate airspace in accordance with the following airspace classification and in accordance with Appendix 4:

• (1) Class A. IFR flights only are permitted. All flights are provided with air traffic control service and are separated from each other. Continuous air- ground voice communications are required for all flights. All flights shall be subject to ATC clearance.

• (2) Class B. IFR and VFR flights are permitted. All flights are provided with air traffic control service and are separated from each other. Continuous air- ground voice communications are required for all flights. All flights shall be subject to ATC clearance.

• (3) Class C. IFR and VFR flights are permitted. All flights are provided with air traffic control service and IFR flights are separated from other IFR flights and from VFR flights. VFR flights are separated from IFR flights and receive traffic information in respect of other VFR flights and traffic avoidance advice on request. Continuous air-ground voice communications are required for all flights. For VFR flights a speed limitation of 250 kts indicated airspeed (IAS) applies below 3 050 m (10 000 ft) AMSL, except where approved by the competent authority for aircraft types, which for technical or safety reasons, cannot maintain this speed. All flights shall be subject to ATC clearance.

• (4) Class D. IFR and VFR flights are permitted and all flights are provided with air traffic control service. IFR flights are separated from other IFR flights, receive traffic information in respect of VFR flights and traffic avoidance advice on request. VFR flights receive traffic information in respect of all other flights and traffic avoidance advice on request. Continuous air-ground voice communications are required for all flights and a speed limitation of 250 kts IAS applies to all flights below 3 050 m (10 000 ft) AMSL, except where approved by the competent authority for aircraft types, which for technical or safety reasons, cannot maintain this speed. All flights shall be subject to ATC clearance.

• (5) Class E. IFR and VFR flights are permitted. IFR flights are provided with air traffic control service and are separated from other IFR flights. All flights receive traffic information, as far as is practical. Continuous air-ground voice communications are required for IFR flights. A speed limitation of 250 kts IAS applies to all flights below 3 050 m (10 000 ft) AMSL, except where approved by the competent authority for aircraft types, which for technical or safety reasons cannot maintain this speed. All IFR flights shall be subject to ATC clearance. Class E shall not be used for control zones.

• (6) Class F. IFR and VFR flights are permitted. All participating IFR flights receive an air traffic advisory service and all flights receive flight information service if requested. Continuous air-ground voice communications are required for IFR flights participating in the advisory service and all IFR flights shall be capable of establishing air-ground voice communications. A speed limitation of 250 kts IAS applies to all flights below 3 050 m (10 000 ft) AMSL, except where approved by the competent authority for aircraft types, which for technical or safety reasons cannot maintain this speed. ATC clearance is not required.

• (7) Class G. IFR and VFR flights are permitted and receive flight information service if requested. All IFR flights shall be capable of establishing air- ground voice communications. A speed limitation of 250 kts IAS applies to all flights below 3 050 m (10 000 ft) AMSL, except where approved by the competent authority for aircraft types, which for technical or safety reasons cannot maintain this speed. ATC clearance is not required.

• (8) Implementation of Class F shall be considered as a temporary measure until such time as it can be replaced by an alternative classification.

• (b) The designation of the airspace classification shall be appropriate to the needs of the Member States, except that all airspace above FL 195 shall be classified as Class C airspace.’;

• (9) the following point SERA.7002 is inserted:

‘SERA.7002   Collision hazard information when ATS based on surveillance are provided

	(a)	When an identified controlled flight is observed to be on a conflicting path with an unknown aircraft, deemed to constitute a collision hazard, the pilot of the controlled flight shall, whenever practicable: (1) be informed of the unknown aircraft, and, if the pilot so requests, or if the situation so warrants in the opinion of the controller, avoiding action shall be suggested; and (2) be notified when the conflict no longer exists.’;

• (10) the following point SERA.8012 is inserted:

‘SERA.8012   Application of wake turbulence separation

	(a)	Wake turbulence separation minima shall be applied to aircraft in the approach and departure phases of flight under the following circumstances: (1) an aircraft is operating directly behind another aircraft at the same altitude or less than 300 m (1 000 ft) below it; or (2) both aircraft are using the same runway or parallel runways separated by less than 760 m (2 500 ft); or (3) an aircraft is crossing behind another aircraft at the same altitude or less than 300 m (1 000 ft) below it.’;

• (11) point SERA.8015 is amended as follows:

• (a) point (a) is replaced by the following:

• ‘(a) Air traffic control clearances shall be based solely on the following requirements for providing air traffic control service:

• (1) Clearances shall be issued solely for expediting and separating air traffic and be based on known traffic conditions which affect safety in aircraft operation. Such traffic conditions include not only aircraft in the air and on the manoeuvring area over which control is being exercised, but also any vehicular traffic or other obstructions not permanently installed on the manoeuvring area in use.

• (2) ATC units shall issue such ATC clearances as necessary to prevent collisions and to expedite and maintain an orderly flow of air traffic.

• (3) ATC clearances shall be issued early enough to ensure that they are transmitted to the aircraft in sufficient time for it to comply with them.’;

• (b) point (d)(3) is replaced by the following:

• ‘(3) route of flight, …

• (i) the route of flight shall be detailed in each clearance when deemed necessary; and

• (ii) the phrase “cleared via flight planned route” shall not be used when granting a re-clearance.’;

• (c) the following points (ea), (eb) and (ec) are added:

• ‘(ea) Changes in clearance regarding route or level

• (1) When issuing a clearance covering a requested change in route or level, the exact nature of the change shall be included in the clearance.

• (2) When traffic conditions will not permit clearance of a requested change, the word “UNABLE” shall be used. When warranted by circumstances, an alternative route or level shall be offered.

• (eb) Clearance related to altimetry

• (1) For flights in areas where a transition altitude is established, the vertical position of the aircraft shall, except as provided for in (5) below, be expressed in terms of altitudes at or below the transition altitude and in terms of flight levels at or above the transition level. While passing through the transition layer, the vertical position shall be expressed in terms of flight levels when climbing and in terms of altitudes when descending.

• (2) The flight crew shall be provided with the transition level in due time prior to reaching it during descent.

• (3) A QNH altimeter setting shall be included in the descent clearance when first cleared at an altitude below the transition level, in approach clearances or clearances to enter the traffic circuit, and in taxi clearances for departing aircraft except when it is known that the aircraft has already received the information in a directed transmission.

• (4) A QFE altimeter setting shall be provided to aircraft on request or on a regular basis in accordance with local arrangements.

• (5) When an aircraft which has been given clearance to land is completing its approach using atmospheric pressure at aerodrome elevation (QFE), the vertical position of the aircraft shall be expressed in terms of height above aerodrome elevation during that portion of its flight for which QFE may be used, except that it shall be expressed in terms of height above runway threshold elevation:

• (i) for instrument runways if the threshold is 2 m (7 ft) or more below the aerodrome elevation; and

• (ii) for precision approach runways.

• (ec) Conditional clearances

Conditional phrases, such as ‘behind landing aircraft’ or ‘after departing aircraft’, shall not be used for movements affecting the active runway(s), except when the aircraft or vehicles concerned are seen by the appropriate controller and pilot. The aircraft or vehicle causing the condition in the clearance issued shall be the first aircraft/vehicle to pass in front of the other aircraft concerned. In all cases, a conditional clearance shall be given in the following order and consist of:

• (1) the call sign;

• (2) the condition;

• (3) the clearance; and

• (4) a brief reiteration of the condition.’;

• (12) point SERA.8020(a)(3) is replaced by the following:

• ‘(3) Deviation from the requirements in point (1) shall be notified to the appropriate ATS unit.’;

• (13) point SERA.8020(b)(3) is replaced by the following:

• ‘(3) Change in time estimate: if the time estimate for the next applicable reporting point, flight information region boundary or destination aerodrome, whichever comes first, is found to be in error in excess of 2 minutes from that notified to ATS or such other period of time as prescribed by the competent authority, a revised estimated time shall be notified as soon as possible to the appropriate ATS unit.’;

• (14) in point SERA.8025, the following points (2) and (3) are added:

• ‘(2) When a controlled flight has been exempted from the requirement to report at compulsory reporting points, pilots shall, unless automated position reporting is in effect, resume voice or CPDLC position reporting:

• (i) when so instructed;

• (ii) when advised that the ATS surveillance service has been terminated; or

• (iii) when advised that the ATS surveillance identification is lost.

• (3) The format of position reports shall be in accordance with Appendix 5, Point A.’;

• (15) point SERA.8035(b) is replaced by the following:

• ‘(b) The Member States shall comply with the appropriate provisions on communication failures as have been adopted under the Chicago Convention. The Commission shall take the necessary measures for the transposition of those provisions into Union law so as to establish common European procedures on communication failures by 31 December 2017 at the latest.’;

• (16) point SERA.9010 is amended as follows:

• (a) points (b)(12) and (b)(13) are replaced by the following:

• ‘(12) surface wind direction (in degrees magnetic) and speed, including significant variations and, if surface wind sensors related specifically to the sections of runway(s) in use are available and the information is required by aircraft operators, the indication of the runway and the section of the runway to which the information refers;

• (13) visibility and, when applicable, RVR[^ntr*1-L_2016196EN.01000801-E0001] and, if visibility/RVR sensors related specifically to the sections of runway(s) in use are available and the information is required by operators, the indication of the runway and the section of the runway to which the information refers;

[^ntr*1-L_2016196EN.01000801-E0001]: These elements are replaced by the term ‘CAVOK’ when the following conditions occur simultaneously at the time of observation: (a) visibility: 10 km or more, and the lowest visibility not reported; (b) no cloud of operational significance; and (c) no weather of significance to aviation.’;"

• (b) points (c)(12) and (c)(13) are replaced by the following:

• ‘(12) surface wind direction (in degrees magnetic) and speed, including significant variations and, if surface wind sensors related specifically to the sections of runway(s) in use are available and the information is required by aircraft operators, the indication of the runway and the section of the runway to which the information refers;

• (13) visibility and, when applicable, RVR[^ntr*2-L_2016196EN.01000801-E0002] and, if visibility/RVR sensors related specifically to the sections of runway(s) in use are available and the information is required by operators, the indication of the runway and the section of the runway to which the information refers;

[^ntr*2-L_2016196EN.01000801-E0002]: These elements are replaced by the term ‘CAVOK’ when the following conditions occur simultaneously at the time of observation: (a) visibility: 10 km or more, and the lowest visibility not reported; (b) no cloud of operational significance; and (c) no weather of significance to aviation.’;"

• (c) points (d)(11) and (d)(12) are replaced by the following:

• ‘(11) surface wind direction (in degrees magnetic) and speed, including significant variations and, if surface wind sensors related specifically to the sections of runway(s) in use are available and the information is required by aircraft operators, the indication of the runway and the section of the runway to which the information refers;

• (12) visibility and, when applicable RVR[^ntr*3-L_2016196EN.01000801-E0003] and, if visibility/RVR sensors related specifically to the sections of runway(s) in use are available and the information is required by operators, the indication of the runway and the section of the runway to which the information refers;

[^ntr*3-L_2016196EN.01000801-E0003]: These elements are replaced by the term ‘CAVOK’ when the following conditions occur simultaneously at the time of observation: (a) visibility: 10 km or more, and the lowest visibility not reported; (b) no cloud of operational significance; and (c) no weather of significance to aviation.’;"

• (17) in point SERA.10001, the following points (b) and (c) are added:

• ‘(b) Unless otherwise prescribed by the competent authority, aircraft equipped with suitable two-way radio-communications shall report during the period 20 to 40 minutes following the time of the last contact, whatever the purpose of such contact, merely to indicate that the flight is progressing according to plan, such report to comprise identification of the aircraft and the words “Operations normal”.

• (c) The “Operations normal” message shall be transmitted air-ground to an appropriate ATS unit.’;

• (18) points SERA.11001 (a) and (b) and SERA.11005 (a) are deleted and SERA.11001 and SERA.11005 are replaced by the following:

‘SERA.11001   General

• (c) In case of an aircraft known or believed to be in a state of emergency, including being subjected to unlawful interference, ATS units shall give the aircraft maximum consideration, assistance and priority over other aircraft, as may be necessitated by the circumstances.

• (d) Subsequent ATC actions shall be based on the intentions of the pilot, the overall air traffic situation and the real-time dynamics of the contingency.

SERA.11005   Unlawful interference

• (aa) An aircraft which is being subjected to unlawful interference shall endeavour to set the transponder to Code 7500 and notify the appropriate ATS unit of any significant circumstances associated therewith and any deviation from the current flight plan necessitated by the circumstances, in order to enable the ATS unit to give priority to the aircraft and to minimise conflict with other aircraft.

• (ab) If an aircraft is subjected to unlawful interference, the pilot-in-command shall attempt to land as soon as practicable at the nearest suitable aerodrome or at a dedicated aerodrome assigned by the competent authority, unless considerations aboard the aircraft dictate otherwise.

• (b) When an occurrence of unlawful interference with an aircraft takes place or is suspected, air traffic services units shall attend promptly to requests by the aircraft. Information pertinent to the safe conduct of the flight shall continue to be transmitted and necessary action shall be taken to expedite the conduct of all phases of the flight, especially the safe landing of the aircraft.

• (c) When an occurrence of unlawful interference with an aircraft takes place or is suspected, ATS units shall, in accordance with locally agreed procedures, immediately inform the appropriate authority designated by the State and exchange necessary information with the aircraft operator or its designated representative.’;

• (19) point SERA.11010 is amended as follows:

• (a) the title is replaced by the following:

‘SERA.11010   Strayed or unidentified aircraft’;

• (b) point (a)(3)(i) is replaced by the following:

• ‘(i) advise the aircraft of its position and the corrective action to be taken. This advice shall be immediately provided when the ATS unit is aware that there is a possibility of interception or other hazard to the safety of the aircraft; and’;

• (20) the following points SERA.11012 and SERA.11013 are inserted:

‘SERA.11012   Minimum Fuel and Fuel Emergency

• (a) When a pilot reports a state of minimum fuel, the controller shall inform the pilot as soon as practicable of any anticipated delays or that no delays are expected.

• (b) When the level of fuel renders declaring a situation of distress necessary, the pilot, in accordance with SERA.14095, shall indicate that by using the radiotelephony distress signal (MAYDAY), preferably spoken three times, followed by the nature of the distress condition (FUEL).

SERA.11013   Degraded aircraft performance

• (a) Whenever, as a result of failure or degradation of navigation, communications, altimetry, flight control or other systems, aircraft performance is degraded below the level required for the airspace in which it is operating, the flight crew shall advise the ATC unit concerned without delay. Where the failure or degradation affects the separation minimum currently being employed, the controller shall take action to establish another appropriate type of separation or separation minimum.

• (b) Degradation or failure of the RNAV system

When an aircraft cannot meet the specifications as required by the RNAV route or procedure, as a result of a failure or degradation of the RNAV system, a revised clearance shall be requested by the pilot.

• (c) Loss of vertical navigation performance required for reduced vertical separation minima (RVSM) airspace

• (1) The pilot shall inform ATC as soon as possible of any circumstances where the vertical navigation performance requirements for RVSM airspace cannot be maintained. In such cases, the pilot shall obtain a revised ATC clearance prior to initiating any deviation from the cleared route and/or flight level, whenever possible. When a revised ATC clearance cannot be obtained prior to such a deviation, the pilot shall obtain a revised clearance as soon as possible thereafter.

• (2) During operations in, or vertical transit through, RVSM airspace with aircraft not approved for RVSM operations, pilots shall report non-approved status as follows:

• (i) at initial call on any channel within RVSM airspace;

• (ii) in all requests for level changes; and

• (iii) in all read-backs of level clearances.

• (3) Air traffic controllers shall explicitly acknowledge receipt of messages from aircraft reporting RVSM non-approved status.

• (4) Degradation of aircraft equipment — pilot-reported:

• (i) When informed by the pilot of an RVSM-approved aircraft operating in RVSM airspace that the aircraft's equipment no longer meets the RVSM requirements, ATC shall consider the aircraft as non-RVSM-approved.

• (ii) ATC shall take action immediately to provide a minimum vertical separation of 600 m (2 000 ft) or an appropriate horizontal separation from all other aircraft concerned that are operating in RVSM airspace. An aircraft rendered non-RVSM-approved shall normally be cleared out of RVSM airspace by ATC when it is possible to do so.

• (iii) Pilots shall inform ATC, as soon as practicable, of any restoration of the proper functioning of equipment required to meet the RVSM requirements.

• (iv) The first ACC to become aware of a change in an aircraft's RVSM status shall coordinate with adjacent ACCs, as appropriate.

• (5) Severe turbulence — not forecast:

• (i) When an aircraft operating in RVSM airspace encounters severe turbulence due to weather or wake vortex that the pilot believes will impact the aircraft's capability to maintain its cleared flight level, the pilot shall inform ATC. ATC shall establish either an appropriate horizontal separation or an increased minimum vertical separation.

• (ii) ATC shall, to the extent possible, accommodate pilot requests for flight level and/or route changes and shall pass on traffic information, as required.

• (iii) ATC shall solicit reports from other aircraft to determine whether RVSM should be suspended entirely or within a specific flight level band and/or area.

• (iv) The ACC suspending RVSM shall coordinate with adjacent ACCs such suspension(s) and any required adjustments to sector capacities, as appropriate, to ensure an orderly progression of the transfer of traffic.

• (6) Severe turbulence — forecast:

• (i) When a meteorological forecast is predicting severe turbulence within RVSM airspace, ATC shall determine whether RVSM should be suspended and, if so, for how long and for which specific flight level(s) and/or area.

• (ii) In cases where RVSM will be suspended, the ACC suspending RVSM shall coordinate with adjacent ACCs with regard to the flight levels appropriate for the transfer of traffic, unless a contingency flight level allocation scheme has been determined by letter of agreement. The ACC suspending RVSM shall also coordinate applicable sector capacities with adjacent ACCs, as appropriate.’;

• (21) the following point SERA.11014 is inserted:

‘SERA.11014   ACAS resolution advisory (RA)

• (a) ACAS II shall be used during flight, except as provided in the minimum equipment list specified in Commission Regulation (EU) No 965/2012⁸ in a mode that enables RA indications to be produced for the flight crew when undue proximity to another aircraft is detected. This shall not apply if inhibition of RA indication mode (using traffic advisory (TA) indication only or equivalent) is called for by an abnormal procedure or due to performance-limiting conditions.

• (b) In the event of an ACAS RA, pilots shall:

• (1) respond immediately by following the RA, as indicated, unless doing so would jeopardise the safety of the aircraft;

• (2) follow the RA even if there is a conflict between the RA and an ATC instruction to manoeuvre;

• (3) not manoeuvre in the opposite sense to an RA;

• (4) as soon as possible, as permitted by flight crew workload, notify the appropriate ATC unit of any RA which requires a deviation from the current ATC instruction or clearance;

• (5) promptly comply with any modified RAs;

• (6) limit the alterations of the flight path to the minimum extent necessary to comply with the RAs;

• (7) promptly return to the terms of the ATC instruction or clearance when the conflict is resolved; and

• (8) notify ATC when returning to the current clearance.

• (c) When a pilot reports an ACAS RA, the controller shall not attempt to modify the aircraft flight path until the pilot reports “CLEAR OF CONFLICT”.

• (d) Once an aircraft departs from its ATC clearance or instruction in compliance with an RA, or a pilot reports an RA, the controller ceases to be responsible for providing separation between that aircraft and any other aircraft affected as a direct consequence of the manoeuvre induced by the RA. The controller shall resume responsibility for providing separation to all the affected aircraft when:

• (1) the controller acknowledges a report from the flight crew that the aircraft has resumed the current clearance; or

• (2) the controller acknowledges a report from the flight crew that the aircraft is resuming the current clearance and issues an alternative clearance which is acknowledged by the flight crew.

• (22) in point SERA.11015(e), Table S11-3 is amended as follows:

• (a) the text in the cell ‘Meaning’ corresponding to phrase ‘WILCO’, is replaced by the following:

‘Understood, will comply’;

• (b) in the cell below the phrase ‘WILCO’, the phrase ‘Will comply’ is deleted;

• (23) in point SERA.12005, the following point (c) is added:

• ‘(c) Flight crews shall compile the reports using forms based on the model AIREP SPECIAL form as set out in point A of Appendix 5. Those reports shall comply with the detailed instructions for reporting, as provided in point 2 of Appendix 5.

• (1) The detailed instructions, including the formats of messages and the phraseologies provided in Appendix 5, shall be used by flight crews when transmitting air-reports and by ATS units when retransmitting such reports.

• (2) Special air-reports containing observations of volcanic activity shall be recorded on the special air-report of volcanic activity form. Forms based on the model form for special air-reports of volcanic activity set out in point B of Appendix 5 shall be provided for flight crews operating on routes which could be affected by volcanic ash clouds.’;

• (24) point SERA.12020(a)(2) is replaced by the following:

• ‘(2) the associated meteorological watch office (MWO) in accordance with point 3 of Appendix 5; and’;

• (25) the following Sections 13 and 14 are added:

‘SECTION 13

SSR Transponder

SERA.13001   Operation of an SSR transponder

• (a) When an aircraft carries a serviceable SSR transponder, the pilot shall operate the transponder at all times during flight, regardless of whether the aircraft is within or outside airspace where SSR is used for ATS purposes.

• (b) Pilots shall not operate the IDENT feature unless requested by ATS.

• (c) Except for flight in airspace designated by the competent authority for mandatory operation of transponder, aircraft without sufficient electrical power supply are exempted from the requirement to operate the transponder at all times.

SERA.13005   SSR transponder Mode A code setting

• (a) To indicate that it is in a specific contingency situation, the pilot of an aircraft equipped with SSR shall:

• (1) select Code 7700 to indicate a state of emergency unless ATC has previously directed the pilot to operate the transponder on a specified code. In the latter case, a pilot may nevertheless select Code 7700 whenever there is a specific reason to believe that this would be the best course of action;

• (2) select Code 7600 to indicate a state of radio-communication failure;

• (3) attempt to select Code 7500 to indicate a state of unlawful interference. If circumstances so warrant, Code 7700 should be used instead.

• (b) Except in the cases described in (a) above, the pilot shall:

• (1) select codes as instructed by the ATS unit; or

• (2) in the absence of ATS instructions related to code setting, select code 2000 or another code as prescribed by the competent authority; or

• (3) when not receiving air traffic services, select code 7000 in order to improve the detection of suitably equipped aircraft unless otherwise prescribed by the competent authority.

• (c) When it is observed that the code shown on the situation display is different from what has been assigned to the aircraft:

• (1) the pilot shall be requested to confirm the code selected and, if the situation warrants, to reselect the correct code; and

• (2) if the discrepancy between assigned and displayed codes still persists, the pilot may be requested to stop the operation of the aircraft's transponder. The next control position and any other affected unit using SSR and/or multilateration (MLAT) in the provision of ATS shall be informed accordingly.

SERA.13010   Pressure-altitude-derived information

• (a) When the aircraft carries serviceable Mode C equipment, the pilot shall continuously operate this mode unless otherwise dictated by ATC.

• (b) Unless otherwise prescribed by the competent authority, verification of the pressure-altitude-derived level information displayed to the controller shall be effected at least once by each suitably equipped ATC unit on initial contact with the aircraft concerned or, if this is not feasible, as soon as possible thereafter.

SERA.13015   SSR transponder Mode S aircraft identification setting

• (a) Aircraft equipped with Mode S having an aircraft identification feature shall transmit the aircraft identification as specified in Item 7 of the ICAO flight plan or, when no flight plan has been filed, the aircraft registration.

• (b) Whenever it is observed on the situation display that the aircraft identification transmitted by a Mode S-equipped aircraft is different from that expected from the aircraft, the pilot shall be requested to confirm and, if necessary, re-enter the correct aircraft identification.

• (c) If, following confirmation by the pilot that the correct aircraft identification has been set on the Mode S identification feature, the discrepancy continues to exist, the controller shall take the following actions:

• (1) inform the pilot of the persistent discrepancy;

• (2) where possible, correct the label showing the aircraft identification on the situation display; and

• (3) notify the next control position and any other unit concerned using Mode S for identification purposes that the aircraft identification transmitted by the aircraft is erroneous.

SERA.13020   SSR transponder failure when the carriage of a functioning transponder is mandatory

• (a) In case of a transponder failure after departure, ATC units shall attempt to provide for continuation of the flight to the destination aerodrome in accordance with the flight plan. Pilots may, however, be expected to comply with specific restrictions.

• (b) In the case of a transponder which has failed and cannot be restored before departure, pilots shall:

• (1) inform ATS as soon as possible, preferably before submission of a flight plan;

• (2) insert in Item 10 of the ICAO flight plan form under SSR the character ‘N’ for complete unserviceability of the transponder or, in case of partial transponder failure, insert the character corresponding to the remaining transponder capability; and

• (3) comply with any published procedures for requesting an exemption from the requirements to carry a functioning SSR transponder.

SECTION 14

Voice communication procedures

SERA.14001   General

Standardised phraseology shall be used in all situations for which it has been specified. Only when standardised phraseology cannot serve an intended transmission, plain language shall be used.

SERA.14005   Categories of messages

• (a) The categories of messages handled by the aeronautical mobile service, and the order of priority in the establishment of communications and the transmission of messages shall be in accordance with Table S14-1.

Table S14-1

Message category and radiotelephony order of priority signal	Radiotelephony signal
(a) Distress calls, distress messages and distress traffic	MAYDAY
(b) Urgency messages, including messages preceded by the medical transports signal	PAN PAN or PAN PAN MEDICAL
(c) Communications relating to direction finding	—
(d) Flight safety messages	—
(e) Meteorological messages	—
(f) Flight regularity messages	—

• (b) Distress messages and distress traffic shall be handled in accordance with the provisions of point SERA.14095.

• (c) Urgency messages and urgency traffic, including messages preceded by the medical transports signal, shall be handled in accordance with the provisions of point SERA.14095.

SERA.14010   Flight safety messages

Flight safety messages shall comprise the following:

• (a) movement and control messages;

• (b) messages originated by an aircraft operator or by an aircraft, of immediate concern to an aircraft in flight;

• (c) meteorological advice of immediate concern to an aircraft in flight or about to depart (individually communicated or for broadcast);

• (d) other messages concerning aircraft in flight or about to depart.

SERA.14015   Language to be used in air-ground communication

• (a) The air-ground radiotelephony communications shall be conducted in the English language or in the language normally used by the station on the ground.

• (b) The English language shall be available, on request of any aircraft, at all stations on the ground serving designated aerodromes and routes used by international air services. Unless otherwise prescribed by the competent authority for specific cases, the English language shall be used for communications between the ATS unit and aircraft, at aerodromes with more than 50 000 international IFR movements per year. Member States, where at the date of entry into force of this Regulation, the English language is not the only language used for communications between the ATS unit and aircraft at such aerodromes, may decide not to apply the requirement to use the English language and inform the Commission accordingly. In that case, those Member States shall, by 31 December 2017 at the latest, conduct a study on the possibility to require the use of the English language for communications between the ATS unit and aircraft at those aerodromes for reasons of safety, so as to avoid incursions of aircraft on an occupied runway or other safety risks, while taking into account the applicable provisions of Union and national law on the use of languages. They shall make that study public and communicate its conclusions to the Agency and the Commission.

• (c) The languages available at a given station on the ground shall form part of the Aeronautical Information Publications and other published aeronautical information concerning such facilities.

SERA.14020   Word spelling in radiotelephony

When proper names, service abbreviations and words of which the spelling is doubtful are spelled out in radiotelephony, the alphabet in the Table S14-2 shall be used.

Table S14-2

The radiotelephony spelling alphabet

Letter	Word	Approximate pronunciation (Latin alphabet representation)
A	Alfa	AL FAH
B	Bravo	BRAH VOH
C	Charlie	CHAR LEE or SHAR LEE
D	Delta	DELL TAH
E	Echo	ECK OH
F	Foxtrot	FOKS TROT
G	Golf	GOLF
H	Hotel	HO TELL
I	India	IN DEE AH
J	Juliett	JEW LEE ETT
K	Kilo	KEY LOH
L	Lima	LEE MAH
M	Mike	MIKE
N	November	NO VEM BER
O	Oscar	OSS CAH
P	Papa	PAH PAH
Q	Quebec	KEH BECK
R	Romeo	ROW ME OH
S	Sierra	SEE AIR RAH
T	Tango	TANG GO
U	Uniform	YOU NEE FORM or OO NEE FORM
V	Victor	VIK TAH
W	Whiskey	WISS KEY
X	X-ray	ECKS RAY
Y	Yankee	YANG KEY
Z	Zulu	ZOO LOO
In the approximate representation using the Latin alphabet, syllables to be emphasised are underlined.	In the approximate representation using the Latin alphabet, syllables to be emphasised are underlined.	In the approximate representation using the Latin alphabet, syllables to be emphasised are underlined.

SERA.14025   Principles governing the identification of ATS routes other than standard departure and arrival routes

• (a) Use of ATS route designators in communications

• (1) In voice communications, the basic letter of a designator shall be spoken in accordance with the spelling alphabet as defined in Table S14-2.

• (2) Where the prefixes K, U or S are used, they shall, in voice communications, be spoken as follows:

(i)	K	—	KOPTER
(ii)	U	—	UPPER
(iii)	S	—	SUPERSONIC

• (b) The word “kopter” shall be pronounced as in the word “helicopter” and the words “upper” and “supersonic” as in the English language.

SERA.14026   Significant points

Normally the plain language name for significant points marked by the site of a radio navigation aid, or the unique five-letter pronounceable “name-code” for significant points not marked by the site of a radio navigation aid, shall be used to refer to the significant point in voice communications. If the plain language name for the site of a radio navigation aid is not used, it shall be replaced by the coded designator which, in voice communications, shall be spoken in accordance with the spelling alphabet.

SERA.14030   Use of designators for standard instrument departure and arrival routes

The plain language designator for standard instrument departure or arrival routes shall be used in voice communications.

SERA.14035   Transmission of numbers in radiotelephony

	(a)	Transmission of numbers (1) All numbers used in the transmission of aircraft call sign, headings, runway, wind direction and speed shall be transmitted by pronouncing each digit separately. (i) Flight levels shall be transmitted by pronouncing each digit separately, except for the case of flight levels in whole hundreds. (ii) The altimeter setting shall be transmitted by pronouncing each digit separately, except for the case of a setting of 1 000 hPa, which shall be transmitted as “ONE THOUSAND”. (iii) All numbers used in the transmission of transponder codes shall be transmitted by pronouncing each digit separately except that, when the transponder codes contain whole thousands only, the information shall be transmitted by pronouncing the digit in the number of thousands followed by the word “THOUSAND”. (2) All numbers used in transmission of other information than those described in point (a)(1) shall be transmitted by pronouncing each digit separately, except that all numbers containing whole hundreds and whole thousands shall be transmitted by pronouncing each digit in the number of hundreds or thousands followed by the word “HUNDRED” or “THOUSAND”, as appropriate. Combinations of thousands and whole hundreds shall be transmitted by pronouncing each digit in the number of thousands followed by the word “THOUSAND”, followed by the number of hundreds followed by the word “HUNDRED”. (3) In cases where there is a need to clarify the number transmitted as whole thousands and/or whole hundreds, the number shall be transmitted by pronouncing each digit separately. (4) When providing information regarding the relative bearing to an object or to conflicting traffic in terms of the 12-hour clock, the information shall be given pronouncing the digits together such as “TEN O'CLOCK” or “ELEVEN O'CLOCK”. (5) Numbers containing a decimal point shall be transmitted as prescribed in point (a)(1) with the decimal point in appropriate sequence, indicated by the word “DECIMAL”. (6) All six digits of the numerical designator shall be used to identify the transmitting channel in very high frequency (VHF) radiotelephony communications, except in the case of both the fifth and sixth digits being zeros, in which case only the first four digits shall be used.

SERA.14040   Pronunciation of numbers

When the language used for communication is English, numbers shall be transmitted using the pronunciation shown in Table S14-3:

Table S14-3

Numeral or numeral element	Pronunciation
0	ZE-RO
1	WUN
2	TOO
3	TREE
4	FOW-er
5	FIFE
6	SIX
7	SEV-en
8	AIT
9	NIN-er
10	TEN
11	EE-LE-VEN
12	TWELF
Decimal	DAY-SEE-MAL
Hundred	HUN-dred
Thousand	TOU-SAND

SERA.14045   Transmitting technique

• (a) Transmissions shall be conducted concisely in a normal conversational tone.

• (b) The following words and phrases shall be used in radiotelephony communications as appropriate and shall have the meaning ascribed in Table S14-4:

Table S14-4

Phrase	Meaning
ACKNOWLEDGE	“Let me know that you have received and understood this message.”
AFFIRM	“Yes.”
APPROVED	“Permission for proposed action granted.”
BREAK	“I hereby indicate the separation between portions of the message.”
BREAK BREAK	“I hereby indicate the separation between messages transmitted to different aircraft in a very busy environment.”
CANCEL	“Annul the previously transmitted clearance.”
CHECK	“Examine a system or procedure.”
CLEARED	“Authorised to proceed under the conditions specified.”
CONFIRM	“I request verification of: (clearance, instruction, action, information).”
CONTACT	“Establish communications with…”
CORRECT	“True” or “Accurate”.
CORRECTION	“An error has been made in this transmission (or message indicated). The correct version is…”
DISREGARD	“Ignore.”
HOW DO YOU READ	“What is the readability of my transmission?” (see point SERA.14070(c))
I SAY AGAIN	“I repeat for clarity or emphasis.”
MAINTAIN	“Continue in accordance with the condition(s) specified” or in its literal sense.
MONITOR	“Listen out on (frequency).”
NEGATIVE	“No” or“Permission not granted” or“That is not correct” or“Not capable”.
OVER	“My transmission is ended, and I expect a response from you.”
OUT	“This exchange of transmissions is ended and no response is expected.”
READ BACK	“Repeat all, or the specified part, of this message back to me exactly as received.”
RECLEARED	“A change has been made to your last clearance and this new clearance supersedes your previous clearance or part thereof.”
REPORT	“Pass me the following information…”
REQUEST	“I should like to know…” or“I wish to obtain…”
ROGER	“I have received all of your last transmission.”
SAY AGAIN	“Repeat all, or the following part, of your last transmission.”
SPEAK SLOWER	“Reduce your rate of speech.”
STANDBY	“Wait and I will call you.”
UNABLE	“I cannot comply with your request, instruction, or clearance.”
WILCO	(Abbreviation for “will comply”) “I understand your message and will comply with it.”
WORDS TWICE	(a) As a request:“Communication is difficult. Please send every word, or group of words, twice.” (b) As information:“Since communication is difficult, every word, or group of words, in this message will be sent twice.”

SERA.14050   Radiotelephony call signs for aircraft

• (a) Full call signs:

An aircraft radiotelephony call sign shall be one of the following types:

(1) Type (a)— the characters corresponding to the registration marking of the aircraft; or

(2) Type (b)— the telephony designator of the aircraft operator, followed by the last four characters of the registration marking of the aircraft;

(3) Type (c)— the telephony designator of the aircraft operator, followed by the flight identification.

• (b) Abbreviated call signs:

The aircraft radiotelephony call signs shown in point (a), with the exception of Type (c), may be abbreviated under the circumstances prescribed in point SERA.14055(c). Abbreviated call signs shall be in the following form:

(1) Type (a)— the first character of the registration and at least the last two characters of the call sign;

(2) Type (b)— the telephony designator of the aircraft operator, followed by at least the last two characters of the call sign;

(3) Type (c)— no abbreviated form.

SERA.14055   Radiotelephony procedures

• (a) An aircraft shall not change the type of its radiotelephony call sign during flight, except temporarily on the instruction of an ATC unit in the interests of safety. Except for reasons of safety, no transmission shall be directed to an aircraft during take-off, during the last part of the final approach or during the landing roll.

• (b) Establishment of radiotelephony communications

• (1) Full radiotelephony call signs shall always be used when establishing communication. When establishing communication, aircraft shall start their call by the designation of the station called, followed by the designation of the station calling.

• (2) The reply to the above calls shall use the call sign of the station calling, followed by the call sign of the station answering, which shall be considered an invitation to proceed with transmission by the station calling. For transfers of communication within one ATS unit, the call sign of the ATS unit may be omitted, when so authorised by the competent authority.

• (3) Communications shall commence with a call and a reply when it is desired to establish contact, except that, when it is certain that the station called will receive the call, the calling station may transmit the message, without waiting for a reply from the station called.

• (c) Subsequent radiotelephony communications

• (1) Abbreviated radiotelephony call signs, as prescribed in point SERA.14050(b), shall be used only after satisfactory communication has been established and provided that no confusion is likely to arise. An aircraft shall use its abbreviated call sign only after it has been addressed in this manner by the aeronautical station.

• (2) When issuing ATC clearances and reading back such clearances, controllers and pilots shall always add the call sign of the aircraft to which the clearance applies. For other than those occasions, continuous two-way communication after contact has been established shall be permitted without further identification or call until termination of the contact.

SERA.14060   Transfer of VHF communications

• (a) An aircraft shall be advised by the appropriate ATS unit to transfer from one radio frequency to another in accordance with agreed procedures. In the absence of such advice, the aircraft shall notify the ATS unit before such a transfer takes place.

• (b) When establishing initial contact on, or when leaving, a VHF frequency, an aircraft shall transmit such information as may be prescribed by the ANSP responsible for the provision of services and approved by the competent authority.

SERA.14065   Radiotelephony procedures for air-ground voice communication channel changeover

• (a) Unless otherwise prescribed by the ANSP responsible for the provision of services and approved by the competent authority, the initial call to an ATS unit after a change of air-ground voice communication channel shall contain the following elements:

• (1) the designation of the ATS unit being called;

• (2) call sign and, for aircraft in the heavy wake turbulence category, the word “Heavy” or “Super” if that aircraft has been so identified by the competent authority;

• (3) level, including passing and cleared levels, if not maintaining the cleared level;

• (4) speed, if assigned by ATC; and

• (5) additional elements, as required by the ANSP responsible for the provision of services and approved by the competent authority.

• (b) Pilots shall provide level information at the nearest full 30 m or 100 ft as indicated on the pilot's altimeter.

• (c) Initial call to aerodrome control tower

For aircraft being provided with aerodrome control service, the initial call shall contain:

• (1) the designation of the ATS unit being called;

• (2) call sign and, for aircraft in the heavy wake turbulence category, the word “Heavy” or “Super” if that aircraft has been so identified by the competent authority;

• (3) position; and

• (4) additional elements, as required by the ANSP responsible for the provision of services and approved by the competent authority.

SERA.14070   Test procedures

• (a) The form of test transmissions shall be as follows:

• (1) the identification of the station being called;

• (2) the identification of the station calling;

• (3) the words “RADIO CHECK”;

• (4) the frequency being used.

• (b) The reply to a test transmission shall be as follows:

• (1) the identification of the station requesting the test;

• (2) the identification of the station replying;

• (3) information regarding the readability of the station requesting the test transmission.

• (c) When the tests are made, the following readability scale shall be used:

Readability Scale

(1)	1	Unreadable
(2)	2	Readable now and then
(3)	3	Readable but with difficulty
(4)	4	Readable
(5)	5	Perfectly readable

SERA.14075   Exchange of communications

• (a) Communications shall be concise and unambiguous, using standard phraseology whenever available.

• (1) When transmitted by an aircraft, the acknowledgement of receipt of a message shall comprise the call sign of that aircraft.