The cockpit door control unit is the system controller, in charge of :
‐ Locking or unlocking the door latches, upon flight crew action.
‐ Unlocking the door, in case of cockpit decompression (the door then opens towards the cockpit
under differential pressure).
- (1) Strikes' status lights
Off : The corresponding (upper, mid, or lower) locking latch is operative. On : The corresponding (upper, mid, or lower) locking latch is faulty.
- (2) Pressure sensor
Two redundant differential pressure sensors enable rapid pressure variation in the cockpit to be detected, in order to command simultaneous opening of all latches when a defined pressure drop is detected.
- (3) Pressure sensor status lights
Off : The corresponding (1 or 2) pressure sensor is operative.