The landing gear warning horn sounds when the gear is retracted and:

• A. Both thrust reversers armed
• B. Stalling warning active
• C. Landing gear mispositioned
• D. Either of the two listed conditions occur

Answer: (D)

In this system, the landing gear warning horn isn’t tied only to where the gear is, but to specific abnormal flight configurations that can occur after retraction. The horn will sound when the gear is retracted and either of two conditions is present: the thrust reversers are armed, or a stall warning is active. This alerts the crew to verify the current configuration because both situations represent conditions that could indicate an unsafe or non-typical setup while the gear is up. The idea is to prompt a check of gear position and system configuration even when the gear isn’t down, since push-button reverser arming or a stall condition can affect flight safety. A mispositioned gear status, while important, is handled by other indicators and isn’t the trigger for this horn in the described scenario.