Question 124 - IFR Communications - ATPL - Airline Transport Pilot license

Set transponder Code 7600 and follow any published radio communication failure procedure, or the applicable rules and last acknowledged clearance if no specific procedure applies.
Always maintain the last assigned level for exactly 3 minutes and then climb according to the flight plan.
Immediately climb to the planned cruising level in every case.
Return to the departure aerodrome in every case.

Training tests and timed exam simulations ATPL - Airline Transport Pilot license