Engines - Thrust Reverse (RB211)

Each engine has a hydraulically actuated fan air reverser. Reverse thrust is available on the Ground only.

Hydraulic pressure for the operation of the left and right engine thrust reversers comes from the left and right hydraulic systems respectively. Loss of either hydraulic system renders its respective reverser Inoperative.

Aft movement of the reverser sleeve exposes fixed cascade vanes and closes fan blocker doors, which redirect the flow of fan air forward through the vanes to produce reverse thrust.

Each thrust reverser is automatically protected against unintentional reverse thrust by an autostow feature in the thrust reverser system. If an uncommanded thrust reverser unlock is sensed, hydraulic power is automatically applied to stow the reverser.

Reverse Thrust Levers

Reverse thrust levers

The Reverse Thrust Levers can be raised only when the Forward Thrust Levers are in the idle position. An interlock stop limits thrust to idle reverse while the reverser is in transit. The interlock system also restricts the Forward Thrust Levers from moving forward, until the Reverse Thrust Levers are fully down and the Reverser Sleeves are no longer in transit.

The EECs control thrust limits during reverser operation.

When the reverse thrust levers are pulled aft to the interlock position:

Thrust Reverse.

When the reverser system is activated:

When the interlock releases:

When reverse thrust is no longer required, moving the reverse thrust levers forward and down to the Reverse Idle Detent schedules fuel flow for minimum idle operation.

Pushing the Reverse Thrust Levers to the full down position retracts the reversers to the stowed and locked position. While the reverser is in transit, the REV indication changes color to amber. The thrust levers cannot be moved forward until the reverse thrust levers are fully down. When the reverser reaches the stowed position, the REV annunciation disappears.

REV ISLN

(SB minimizes deployment of thrust reversers inflight and removes thrust reverser isolation light. The SB introduces an electro-mechanical lock which is only released when the aircraft is on the ground and removes the discrete REV ISLN light.)

  • SB not embodied
    The REV ISLN light illuminates and the L/R REV ISLN VAL advisory message is displayed when a fault exists in the reverser system. If the REV ISLN light appears in flight, additional system failures may cause inflight deployment. The affected reverser should deploy normally after landing but may not stow when commanded.

  • SB embodied
    On the ground, the L/R REV ISLN VAL EICAS advisory message is displayed when a fault exits in the reverser system. If this fault is detected above 80 kt during takeoff, or in flight, the message is inhibited until after landing. An electro-mechanical lock prevents uncommanded reverser deployment in the event of additional system failures.

Thrust Reverser Lockout

Thrust Reverser Lockout Pin.

AMM In the event of a failure, the thrust reverser can be manually de-activated by inserting a pair of Lockout Pins into each half of the thrust reverser cowl.

With the thrust reverser deactivated, the reverse thrust lever for the inhibited system can only be raised to the interlock position.

Vibration