If the left gear is up and the right gear is down, and the throttles are closed, which condition allows the warning horn to be grounded through gear switches?

If the left gear is up and the right gear is down, and the throttles are closed, which condition allows the warning horn to be grounded through gear switches?

• A. Through both gear switches
• B. Through the left gear switch only
• C. Through the right gear switch only
• D. Through neither gear switch

Answer: (A)

The warning horn is wired to ground through both gear position switches, so the circuit only completes if both switches provide a ground path. With the left gear up and the right gear down and the throttles closed, each gear switch is in the state that allows grounding, creating a continuous path for current from the horn to ground through both switches. That complete path lets the horn energize. If only one switch provided ground or neither did, the circuit would be open and the horn wouldn’t sound.

The warning horn is wired to ground through both gear position switches, so the circuit only completes if both switches provide a ground path. With the left gear up and the right gear down and the throttles closed, each gear switch is in the state that allows grounding, creating a continuous path for current from the horn to ground through both switches. That complete path lets the horn energize. If only one switch provided ground or neither did, the circuit would be open and the horn wouldn’t sound.