The fuel tanks of aircrafts must be checked for water

Question

ATPL - Airline Transport Pilot license - Aircraft General Knowledge - Airframe, Systems, Powerplant - The fuel tanks of aircrafts must be checked for water

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Before the first flight of the day or after a long turnaround time.

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Immediately After Every Refuelling.

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During refuelling.

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Before Each Flight.

ATPL: The fuel tanks of aircrafts must be checked for water

Question 602, Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license