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159 - ATPL - A ground proximity warning system (GPWS), when mandatory installed on board an aircraft, must in all cases generate:

Question 159 - Aircraft General Knowledge - Instrumentation - ATPL - Airline Transport Pilot license

At least one sound alarm to which a visual alarm can be added
A visual alarm to which a sound alarm can be added
A sound and visual alarm
A sound alarm or a visual alarm

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