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240 - ATPL - The Decision Height (DH) warning light comes on when an aircraft:

Question 240 - Aircraft General Knowledge - Instrumentation - ATPL - Airline Transport Pilot license

Passes over the outer marker.
Descends below a pre-set barometric altitude.
Descends below a pre-set radio altitude.
Passes over the ILS inner marker.

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