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Choose the correct options. Alerting service should be provided to aircraft:

1. under air traffic control
2. that did not arrive after more than 15 minutes of the estimated time of arrival
3. whose last radio contact was more than 15 minutes ago
4. that have filed a flight plan, as far as practicable.
5. that are known to the ATS, as far as practicable.
6. that are known or believed to be subject to an act of unlawful interference

  • A

    1, 2, 4 and 5

  • B

    1, 4, 5 and 6

  • C

    1, 2, 4 and 6

  • D

    2, 3, 4 and 5

Alerting service. A service provided to notify appropriate organizations regarding aircraft in need of search and rescue aid, and assist such organizations as required.

ATS. Air Traffic Service

ICAO Annex 11 
CHAPTER 5. ALERTING SERVICE

5.1.1 Alerting service shall be provided:

a) for all aircraft provided with air traffic control service;

b) in so far as practicable, to all other aircraft having filed a flight plan or otherwise known to the air traffic services; and

c) to any aircraft known or believed to be the subject of unlawful interference.

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