Which unit must sense the compression of both main gear struts to allow reverser deployment?

Which unit must sense the compression of both main gear struts to allow reverser deployment?

• A. Landing Gear Control and Interface Unit
• B. Spoiler Elevator Computer
• C. Flight Management Computer
• D. Hydraulic Control Unit

Answer: (A)

The ability to deploy thrust reversers is tied to the airplane being on the ground and the main gear being loaded. The unit that handles this logic is the Landing Gear Control and Interface Unit. It receives signals indicating the compression of both main gear struts (weight-on-wheels on each side) and uses that to authorize the reverser actuators. If both gears are compressed, reversers can deploy; if either gear isn’t compressed, reversers stay inhibited to prevent unwanted deployment during flight or on a bounced/undercarriage condition. The other units don’t perform this function: the spoiler/elevator computer governs spoilers and elevator behavior, the flight management computer handles flight planning and navigation, and the hydraulic control unit provides hydraulic power but doesn’t control reverser deployment based on gear compression signals.

The ability to deploy thrust reversers is tied to the airplane being on the ground and the main gear being loaded. The unit that handles this logic is the Landing Gear Control and Interface Unit. It receives signals indicating the compression of both main gear struts (weight-on-wheels on each side) and uses that to authorize the reverser actuators. If both gears are compressed, reversers can deploy; if either gear isn’t compressed, reversers stay inhibited to prevent unwanted deployment during flight or on a bounced/undercarriage condition.

The other units don’t perform this function: the spoiler/elevator computer governs spoilers and elevator behavior, the flight management computer handles flight planning and navigation, and the hydraulic control unit provides hydraulic power but doesn’t control reverser deployment based on gear compression signals.