Under which condition will a ground be provided for the warning horn through both gear switches when the throttles are closed?

Under which condition will a ground be provided for the warning horn through both gear switches when the throttles are closed?

• A. Both gears up and the control valve out of neutral.
• B. Right gear up and left gear down.
• C. Left gear up and right gear down.
• D. Both gears down.

Answer: (C)

The warning horn circuit is wired in series through two gear-position switches. For the horn to sound, a continuous ground path must exist through both switches. When the throttles are closed, the system checks gear positions and will only complete the ground path—and thus sound the horn—if one gear is up and the other is down, so that both switches are in the positions that provide ground. That specific combination, left gear up and right gear down, creates a complete ground path through both switches, making the horn sound. If both gears are down or both up, the circuit isn't completed through both switches, so the horn does not sound.

The warning horn circuit is wired in series through two gear-position switches. For the horn to sound, a continuous ground path must exist through both switches. When the throttles are closed, the system checks gear positions and will only complete the ground path—and thus sound the horn—if one gear is up and the other is down, so that both switches are in the positions that provide ground. That specific combination, left gear up and right gear down, creates a complete ground path through both switches, making the horn sound. If both gears are down or both up, the circuit isn't completed through both switches, so the horn does not sound.