Transcowl Locking System

When thrust reverser deployment is commanded, the transcowl locking system electromechanical actuator will be energized. This will unlock the TLS pawl from the transcowl structure load plate within 200 ms. The redundant proximity switches in the TLS will send an unlock signal to the electronic engine control before the pawl moves through the position where it would be incapable of carrying load. At the same time, a lever arm on the TLS pushes the visual indicator (installed on the fan cowl door) to an extended position, indicating that the TLS is unlocked.