AIRPLANE
OPERATIONS
MANUAL
POWERPLANT
JUNE 28, 2002
2-10-70
Page
1
Code
01
THRUST REVERSER (OPTIONAL)
GENERAL
Each engine may be equipped with an optional thrust reverser.
The thrust reverser is for ground operation only, and its function is to
direct engine exhaust gases forward and outwards to produce
deceleration of the airplane.
The thrust reverser system consists of an electric control/indication, an
hydro-mechanical actuation system, and two pivoting doors.
When stowed, the thrust reverser is part of the exhaust nozzle.
LOCK PROTECTION
The system incorporates three locking systems to avoid inadvertent in-
flight deployment. The actuators and doors are mechanically locked in
the stowed position through the primary and secondary locks. In case
the primary and secondary reverser locks fail, the tertiary lock prevents
the door from deploying. In the stowed position, the doors are held by
the primary lock only, with the secondary and tertiary locks remaining
unloaded. The primary and secondary locks are electrically
commanded/controlled and hydraulically powered to unlock. The
tertiary lock is electrically commanded/controlled and electrically
powered to unlock, thus providing a separate and fully independent
locking system.
OPERATION
The thrust reverser is commanded by the backward movement of the
Thrust Lever. Upon selection, the mechanical locks are removed and
hydraulic pressure is applied to deploy the thrust reverser doors. In
reverser mode, the doors rotate about a fixed axis. Rotation of the
doors is controlled by extension and retraction of the hydraulic door
actuators.
After pivoting, the rearmost part of the doors blocks the normal nacelle
discharge path and directs the flow through the aperture created by its
rotation.
The loss of electrical and/or hydraulic power does not result in
inadvertent deployment.
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