CHAPTER 15. PROCEDURES RELATED TO EMERGENCIES,
 COMMUNICATION FAILURE AND CONTINGENCIES

15.1 EMERGENCY PROCEDURES
15.1.1 General
15.1.1.1 The various circumstances surrounding each emergency situation preclude the establishment of exact detailed procedures to be followed. The procedures outlined herein are intended as a general guide to air traffic services personnel. Air traffic control units shall maintain full and complete coordination, and personnel shall use their best judgement in handling emergency situations.
Note 1.— Additional radar procedures to be applied in relation to emergencies and contingencies are contained in Chapter 8, 8.8.1.
Note 2.— If the pilot of an aircraft encountering a state of emergency has previously been directed by ATC to operate the transponder on a specific code, that code will normally be maintained unless, in special circumstances, the pilot has decided or has been advised otherwise. Where ATC has not requested a code to be set, the pilot will set the transponder to Mode A Code 7700.
15.1.1.2 When an emergency is declared by an aircraft, the ATS unit should take appropriate and relevant action as follows:
a)  unless clearly stated by the flight crew or otherwise known, take all necessary steps to ascertain aircraft identification and type, the type of emergency, the intentions of the flight crew as well as the position and level of the aircraft;
b)  decide upon the most appropriate type of assistance which can be rendered;
c)  enlist the aid of any other ATS unit or other services which may be able to provide assistance to the aircraft;
d)  provide the flight crew with any information requested as well as any additional relevant information, such as details on suitable aerodromes, minimum safe altitudes, weather information;
e)  obtain from the operator or the flight crew such of the following information as may be relevant: number of persons on board, amount of fuel remaining, possible presence of hazardous materials and the nature thereof; and
f)  notify the appropriate ATS units and authorities as specified in local instructions.
15.1.1.3 Changes of radio frequency and SSR code should be avoided if possible and should normally be made only when or if an improved service can be provided to the aircraft concerned. Manoeuvring instructions to an aircraft experiencing engine failure should be limited to a minimum. When appropriate, other aircraft operating in the vicinity of the aircraft in emergency should be advised of the circumstances.
Note.— Requests to the flight crew for the information contained in 15.1.1.2 e) will be made only if the information is not available from the operator or from other sources and will be limited to essential information.

15.1.2 Priority
An aircraft known or believed to be in a state of emergency, including being subjected to unlawful interference, shall be given priority over other aircraft.
　
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本文鏈接地址：Security Annex 17 to the Convention on International Civil Aviation(33)