78-34-00
ALL ú ú C01 Page 1 ú Nov 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
5. Feedback Push-Pull Cables_________________________
A. The feedback push-pull cables transfer motion from the thrust reverser
actuator feedback to the strut control box. The cables provide a
mechanical signal of the thrust reverser sleeve position to the strut
control box.
B. A turnbuckle is provided at the output end of the cable for installation
and rigging of the cable.
C. The support tube on the output end of the cable is capable of | 5°
minimum swivel relative to the cable attaching point at the output end.
6. Not Stow and Auto Restow Proximity Sensors__________________________________________
A. Not Stow Proximity Sensors (S835/S836):
(1)
The thrust reverser Not Stow proximity sensor is mounted on the torque box above the upper actuator. One sensor is installed for each thrust reverser C-duct.
(2)
The target for the proximity sensor is installed on the thrust reverser translating sleeve.
(3)
When the sleeve is moved aft from the stowed postion, the sensor is moved out of range of the target.
(4)
When the sensor is out of range, it causes the REVERSE UNLOCKED light on the center instrument panel to come on.
B. Auto Restow Proximity Sensors (S831/S832):
(1)
The thrust reverser auto restow proximity sensor is mounted on the aft side of the thrust reverser torque box below each upper actuator.
(2)
The auto restow sensor is of the proximity type with a target on the thrust reverser sleeve.
(3)
When the sleeve is translated aft from the stowed position, the sensor is moved out of range of the target.
(4)
When the sensor is out of range, it causes the solenoid on the isolation valve to be energized, thus pressurizing the thrust reverser actuation system.
7. Thrust Reverser Sync Lock_________________________
A. The sync lock is an electrically operated mechanical lock installed on the worm shaft of the upper hydraulic actuator on each thrust reverser sleeve. When de-energized, the sync lock holds the rotary flex shafts to prevent the linear movement of the hydraulic actuators and the sleeve.
B. The sync lock contains a pronged rotor which is turned by the rotary flex shaft system. The rotor is held by plungers that engage the rotor. The plungers are spring loaded to the locked position, and are moved to the unlocked position by a solenoid operated yoke when energized.
C. There is not flight compartment indication for sync lock position or
control status.
8. Operation_________
A. Stowed Position
(1)
In the stowed position, the reverse thrust levers are stowed; the forward thrust levers are in any position. The forward/reverse thrust interlock prevents movement of the reverse thrust levers if the forward thrust levers are in any position but idle.
(2)
The thrust reverser control switch is open so the arm solenoid valve on the isolation valve is not energized.
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78-34-00
ALL ú ú C02 Page 2 ú Mar 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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