17.6 Pertinent information shall be given to other aircraft in the vicinity of the presumed position of the aircraft experiencing the failure.
17.7 As soon as it is known that an aircraft which is operating in its area of responsibility is experiencing an apparent radiocommunication failure, an air traffic services unit shall forward information concerning the radiocommuni-cation failure to all air traffic services units concerned along the route of flight. The area control centre in whose area the destination aerodrome is located shall take steps to obtain information on the alternate aerodrome(s) and other relevant information specified in the filed flight plan, if such information is not available.
17.8 If circumstances indicate that a controlled flight experiencing a communication failure might proceed to (one of) the alternate aerodrome(s) specified in the filed flight plan, the air traffic control unit(s) serving the alternate aerodrome(s) and any other air traffic control units that might be affected by a possible diversion shall be informed of the circumstances of the failure and requested to attempt to establish communication with the aircraft at a time when the aircraft could possibly be within communication range. This shall apply particularly when, by agreement with the operator or a designated representative, a clearance has been trans-mitted blind to the aircraft concerned to proceed to an alternate aerodrome, or when weather conditions at the aerodrome of intended landing are such that a diversion to an alternate is considered likely.
17.9 When an air traffic control unit receives information that an aircraft, after experiencing a communi-cation failure has re-established communication or has landed, that unit shall inform the air traffic services unit in whose area the aircraft was operating at the time the failure occurred, and other air traffic services units concerned along the route of flight, giving necessary information for the continuation of control if the aircraft is continuing in flight.
17.10 If the aircraft has not reported within thirty minutes after:
a)  the estimated time of arrival furnished by the pilot;
b)  the estimated time of arrival calculated by the area control centre; or
c)  the last acknowledged expected approach time,

whichever is latest, pertinent information concerning the aircraft shall be forwarded to aircraft operators, or their

5/11/98
No. 2

Rules of the Air and Air Traffic Services (PANS-RAC)
designated representatives, and pilots-in-command of any aircraft concerned and normal control resumed if they so desire. It is the responsibility of the aircraft operators, or their designated representatives, and pilots-in-command of aircraft to determine whether they will resume normal operations or take other action.
OTHER IN-FLIGHT CONTINGENCIES
Note.— The texts of paragraphs 18 and 19 are reproduced from Annex 11, Chapter 2 and have the status of Standards.
18. Strayed or unidentified aircraft
Note 1.— The terms “strayed aircraft” and “unidentified aircraft” in this paragraph have the following meanings:
Strayed aircraft. An aircraft which has deviated significantly from its intended track or which reports that it is lost.
Unidentified aircraft. An aircraft which has been observed or reported to be operating in a given area but whose identity has not been established.
Note 2.— An aircraft may be considered, at the same time, as a “strayed aircraft” by one unit and as an “unidentified aircraft” by another unit.
18.1 As soon as an air traffic services unit becomes aware of a strayed aircraft, it shall take all necessary steps as outlined in 18.1.1 and 18.1.2 to assist the aircraft and to safeguard its flight.
　
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