ATPL: Concerning the sequential pneumatic impulses used in certain leading edge de-icing devices, one can affirm that 1 - They prevent ice formation. 2 - They are triggered from the flight deck after icing has become visible. 3 - A cycle lasts more than ten seconds. 4 - There are more than ten cycles per second: The combination which regroups all the correct statements is:
Question 200, Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license