In the reverser deployment sequence, which source provides the reverse signal used by the LGCIU?

In the reverser deployment sequence, which source provides the reverse signal used by the LGCIU?

• A. Thrust lever angle sensor
• B. Spoiler Elevator Computer (SEC)
• C. Landing Gear Control Unit
• D. Engine Control Unit

Answer: (B)

The signal that starts the reverser deployment sequence comes from the Spoiler Elevator Computer. The SEC runs the sequencing logic for spoilers, elevators, and reversers and decides when it’s safe to deploy thrust reversers (for example, when the aircraft is on the ground and within safe speed limits). When conditions are met and reverser command is given, the SEC sends the reverse command to the Landing Gear Control Unit, which then actuates the reverser mechanisms. Other units don’t generate this specific deployment signal. The thrust lever angle sensor only reports the lever position, the engine control unit manages engine performance, and the landing gear control unit handles gear-related functions; none provide the dedicated reverse signal used by the LGCIU for sequencing reverser deployment.

The signal that starts the reverser deployment sequence comes from the Spoiler Elevator Computer. The SEC runs the sequencing logic for spoilers, elevators, and reversers and decides when it’s safe to deploy thrust reversers (for example, when the aircraft is on the ground and within safe speed limits). When conditions are met and reverser command is given, the SEC sends the reverse command to the Landing Gear Control Unit, which then actuates the reverser mechanisms.

Other units don’t generate this specific deployment signal. The thrust lever angle sensor only reports the lever position, the engine control unit manages engine performance, and the landing gear control unit handles gear-related functions; none provide the dedicated reverse signal used by the LGCIU for sequencing reverser deployment.