737 Flight Crew Operations Manual
Engines, APU -
Engine System Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 7.20.15
The REVERSER light, located on the aft overhead panel, illuminates when the
thrust reverser is commanded to stow and extinguishes 10 seconds later when the
isolation valve closes. Any time the REVERSER light illuminates for more than
approximately 12 seconds, a malfunction has occurred and the MASTER
CAUTION and ENG system annunciator lights illuminate.
Note: A pause in movement of the reverse thrust levers past detent No. 1 toward
the stow position may cause MASTER CAUTION and ENG system
annunciator lights to illuminate. A pause of approximately 18 seconds
engages the electro-mechanical lock and prevents the thrust reverser
sleeves from further movement. Cycling the thrust reversers may clear the
fault and restore normal operation.
When the reverser sleeves are in the stow position, an electro–mechanical lock
and a hydraulically operated locking actuator inhibit motion to each reverser
sleeve until reverser extension is selected. Additionally, an auto–restow circuit
compares the actual reverser sleeve position and the commanded reverser
position. In the event of incomplete stowage or uncommanded movement of the
reverser sleeves toward the deployed position, the auto–restow circuit opens the
isolation valve and commands the control valve to the stow position directing
hydraulic pressure to stow the reverser sleeves. Once the auto–restow circuit is
activated, the isolation valve remains open and the control valve is held in the
stowed position until the thrust reverser is commanded to deploy or until
corrective maintenance action is taken.
WARNING: Actuation of the thrust reversers on the ground without
suitable precautions is dangerous to ground personnel.
September 15, 2016
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