Thrust reverser deployment requires which condition?

Thrust reverser deployment requires which condition?

• A. Radio altimeter < 10 ft RA or air-ground safety sensor in ground mode
• B. Only when on ground
• C. Only above 100 ft RA
• D. Manual activation only

Answer: (A)

Thrust reversers are kept from deploying in flight and are allowed only when the airplane is on or very near the ground. The system uses two signals to confirm this: the radio altimeter reading and the air-ground safety sensor. If the radio altitude is below about 10 ft above the ground, or the safety sensor indicates ground mode, reversers can deploy. This protects the aircraft from unintended deployment during takeoff or during flight, and ensures reversers are active only after touchdown or very near it. The other options don’t match how the protection logic works, since deployment isn’t limited to being on the ground alone, nor is it restricted to high altitudes or solely manual.

Thrust reversers are kept from deploying in flight and are allowed only when the airplane is on or very near the ground. The system uses two signals to confirm this: the radio altimeter reading and the air-ground safety sensor. If the radio altitude is below about 10 ft above the ground, or the safety sensor indicates ground mode, reversers can deploy. This protects the aircraft from unintended deployment during takeoff or during flight, and ensures reversers are active only after touchdown or very near it. The other options don’t match how the protection logic works, since deployment isn’t limited to being on the ground alone, nor is it restricted to high altitudes or solely manual.