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17 - ATPL - In case the transponder fails before the departure for an IFR flight, the pilot shall:

Question 17 - IFR Communications - ATPL - Airline Transport Pilot license

Obtain prior permission by ATC to conduct the flight
Inform ATC after departure
Insert under item 18 of the flight plan 'transponder unserviceable'
Inform FIS for relay to AIS

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