737 MAX Flight Crew Operations Manual
Engines, APU -
Engine System Description
MN-FLT-OH-201
7.20.13
The REVERSER LIMITED light, located on the aft overhead panel, illuminates
in-flight when a fault in the thrust reverser system limits reverser thrust. The thrust
reverser will not deploy or reverse thrust will be limited to idle if commanded. The
REVERSER LIMITED light illuminates on the ground when a malfunction has
occurred. Any time the REVERSER LIMITED light illuminates, 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 8 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. The MAINT light illuminates 30
seconds after landing.
When the reverser sleeves are in the stow position, an electro–mechanical lock
and two hydraulically operated locking actuators inhibit motion to each reverser
sleeve until reverser extension is selected. In the event of incomplete stowage of
the reverser sleeves toward the stowed position, the stow circuit maintains the
isolation valve open and commands the control valve to the stow position
directing hydraulic pressure to stow the reverser sleeves. The isolation valve
remains open and the control valve is held in the stowed position until at least one
locking actuator per sleeve is sensed locked, 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.
March 1, 2021
