Under what conditions can the landing gear warning horn silence button be operated?

The landing gear warning horn silence button is designed for specific operational scenarios, primarily to enhance pilot situational awareness and prevent unnecessary distractions. The correct condition for operating this button occurs when the landing gear is in the UP or APPROACH position, and the power levers are below 79% N1.

This allows the pilot to silence the warning in situations where the gear is deliberately retracted and the aircraft is in a safe configuration—such as during an approach where landing gear may not need to be extended immediately, or in a climb when the aircraft is operating without the landing gear in the drag-reducing position. Operating the silence button under these conditions helps maintain focus on critical flight operations without the continuous distraction of the landing gear warning horn, which is unnecessary when the aircraft is operating as intended in a climb or approach phase with gear retraction.

This capability is not applicable only during landing, taxiing, or when airborne, as those options do not encompass the full scope needed to manage gear warnings effectively in the flight envelope of the aircraft. This reinforces the appropriateness of choice B as it accurately reflects the operational nuances surrounding landing gear management.