ED Decision 2016/023/R
EMERGENCY DESCENT PROCEDURES
(a) When an aircraft operated as a controlled flight experiences sudden decompression or a malfunction requiring an emergency descent, the aircraft should, if able:
(1) initiate a turn away from the assigned route or track before commencing the emergency descent;
(2) advise the appropriate ATC unit as soon as possible of the emergency descent;
(3) set transponder to Code 7700 and select the emergency mode on the automatic dependent surveillance/controller–pilot data link communications (ADS/CPDLC) system, if applicable;
(4) turn on aircraft exterior lights;
(5) watch for conflicting traffic both visually and by reference to airborne collision avoidance system (ACAS) (if equipped); and
(6) coordinate its further intentions with the appropriate ATC unit.
(b) The aircraft is not to descend below the lowest published minimum altitude that will provide a minimum vertical clearance of 300 m (1 000 ft) or, in designated mountainous terrain, of 600 m (2 000 ft) above all obstacles located in the area specified.
(c) Immediately upon recognising that an emergency descent is in progress, ATC units are to acknowledge the emergency on radiotelephony.
In particular, when recognising that an emergency descent is in progress, ATC may, as required by the situation:
(1) suggest a heading to be flown, if able, by the aircraft carrying out the emergency descent in order to achieve separation from other aircraft concerned;
(2) state the minimum altitude for the area of operation, only if the level-off altitude stated by the pilot is below such minimum altitude, together with the applicable QNH altimeter setting; and
(3) as soon as possible, provide separation from conflicting traffic, or issue essential traffic information, as appropriate.
When deemed necessary, ATC will broadcast an emergency message, or cause such message to be broadcast, to other aircraft concerned to warn them of the emergency descent.
EASA aviation regulations mandate emergency descent procedures for controlled flights experiencing sudden decompression or malfunctions. Pilots should turn away from their route, notify ATC, use emergency transponder codes, activate exterior lights, monitor traffic, and coordinate with ATC. Descents must maintain minimum safe altitudes. ATC must acknowledge the emergency, provide guidance, and ensure separation from other aircraft.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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