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A departing aircraft experiencing radio communication failure on an IFR flight under radar vectors is to squawk 7600 and…

  • A
    maintain present heading for 1 minute and thereafter return to the route indicated in the current flight plan on the shortest way.
  • B
    regardless of any limitation previously instructed by ATC, return to the route indicated in the current flight plan in the most direct manner.
  • C
    maintain the heading last assigned by ATC for a period of 3 minutes and then return to the flight path in accordance with the current flight plan.
  • D
    proceed to the route indicated in the current flight plan in the most direct manner.

ICAO Doc 4444
15.3 AIR-GROUND COMMUNICATIONS FAILURE

15.3.3 If the aircraft fails to indicate that it is able to receive and acknowledge transmissions, separation shall be maintained between the aircraft having the communication failure and other aircraft, based on the assumption that the aircraft will:

b) if in instrument meteorological conditions or when conditions are such that it does not appear likely that the pilot will complete the flight in accordance with a):

3) when being vectored or having been directed by ATC to proceed offset using RNAV without a specified limit, proceed in the most direct manner possible to rejoin the current flight plan route no later than the next significant point, taking into consideration the applicable minimum flight altitude;

Note: Several questions check whether you understand when you can commence descent and land. Remember that you must hold over the designated navigation aid serving the destination aerodrome until the EAT (expected approach time) last received and acknowledged and commence descent as close as possible to EAT. In case no EAT has been received and acknowledged, you have to commence descent as close as possible to the ETA (estimated time of arrival) resulting from the current flight plan. Also you must pay attention to the fact that you must land if possible within 30 minutes after ETA (but not before ETA, i.e. not earlier than planned) or the last EAT whichever is later. Basically, you must memorise the items ETA, EAT and plus 30 minutes.

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