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The en-route IFR clearance expires at 0920. What does this mean?
  • A
    The issue of the en-route clearance will be at 0920.
  • B
    It is not allowed to take off before 0920.
  • C
    If the aircraft is not airborne by 0920, a new clearance has to be issued.
  • D
    If the aircraft is not airborne by 0920, it has to return to the ramp and the crew has to file a new flight plan.

ICAO Doc 4444
11.4.2.6 CONTROL MESSAGES

11.4.2.6.2.1 Clearances shall contain the following in the order listed:

a) aircraft identification;
b) clearance limit;
c) route of flight;
d) level(s) of flight for the entire route or part thereof and changes of levels if required;
Note.— If the clearance for the levels covers only part of the route, it is important for the air traffic control unit to specify a point to which the part of the clearance regarding levels applies whenever necessary to ensure compliance with 3.6.5.2.2 a) of Annex 2.
e) any necessary instructions or information on other matters such as SSR transponder operation, approach or departure manoeuvres, communications and the time of expiry of the clearance.

Note.— The time of expiry of the clearance indicates the time after which the clearance will be automatically cancelled if the flight has not been started.

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