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1123 - ATPL Question Bank in English - An IFR aircraft under radar vectors experiences complete radio communication failure in controlled airspace. In accordance with current SERA procedures, the pilot should set the transponder to Code 7600 and, unless a specific published procedure applies:

Question 1123 - Communications - ATPL - Airline Transport Pilot Licence

Immediately return by the shortest route to the route indicated in the filed flight plan.
Maintain the present heading for 1 minute, then continue visually to the nearest suitable aerodrome.
Maintain the last assigned speed and level, or minimum flight altitude if higher, for 20 minutes after indicating the failure to the surveillance system. If a vector/offset limit was specified, continue to it before rejoining the last acknowledged route; without a limit, rejoin no later than the next significant point.
Squawk 7700 and disregard the last acknowledged route clearance.

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