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this section for more information about the electrical operation
of the sync locks.
The manual drive portion of the sync lock engages internal
mechanisms to turn the sync shafts.
Training Information Point
The sync lock unlocks when its solenoid energizes. However,
you manually unlock the sync lock when you push a square
drive tool into the manual drive connector. The square drive tool
pushes in the lock release pin which is inside the drive
connector. The sync lock unlocks when this pin is in.
You must energize the sync lock if you use a wrench on the
manual drive. A wrench does not push the pin at the drive
connector.
Always follow the procedures in the airplane maintenance
manual (AMM) when you use the sync lock as a manual drive
unit.
THRUST REVERSER CONTROL SYSTEM - SYNC LOCK
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
78-34-00-007
THRUST REVERSER CONTROL SYSTEM - SYNC LOCK
THRUST REVERSER CONTROL SYSTEM - SYNC LOCK
EFFECTIVITY
GUN ALL 78-34-00
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
78-34-00-007
Purpose
The engine accessory unit (EAU) has these functions:
* Controls the thrust reverser (T/R) auto-restow operation
* Helps you do trouble-shooting of the T/R control system
* Controls the REVERSER lights on the P5 aft overhead panel
in the flight compartment.
The EAU contains the auto-restow logic circuits. These circuits
control the stow operation. See T/R CONTROL - FUNCTIONAL
DESCRIPTION - STOW CONTROL in this section for more
information.
The built-in test equipment (BITE) helps you do troubleshooting
of the T/R control system. See the training information point
page in this section for more information.
The EAU controls the REVERSER lights on the P5 aft overhead
panel. These lights usually show that there is a T/R system
problem.
See the thrust reverser indicating system section for more
information. (SECTION 78-36)
Component Location
The EAU is on the E3 rack in the electrical equipment (EE)
compartment.
Physical Description
The EAU face has a set of lights and switches for each T/R. A
placard near the bottom, on the face of the EAU supplies BITE
instructions.
THRUST REVERSER CONTROL SYSTEM - ENGINE ACCESSORY UNIT (EAU)
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
78-34-00-008
THRUST REVERSER CONTROL SYSTEM - ENGINE ACCESSORY UNIT (EAU)
THRUST REVERSER CONTROL SYSTEM - ENGINE ACCESSORY UNIT (EAU)
EFFECTIVITY
GUN ALL 78-34-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
78-34-00-008
Purpose
The T/R control valve modules control hydraulic power to the T/
R hydraulic actuators. Each module also has a handle that lets
you deactivate the T/R for maintenance.
Physical Description
Each T/R control valve module has these internal components:
* Isolation valve
* Directional control valve
* Isolation valve proximity sensor
* Directional control valve proximity sensor
* Arm solenoid
* Stow solenoid
* Deploy solenoid
* Manual isolation (shutoff) valve.
See the functional description pages of this section for more
information about how these components work in the T/R
control system.
The manual isolation valve handle has a hole for the T/R
maintenance deactivation pin.
Location
The T/R control valve modules are in the main gear wheel on
the keel beam. The T/R 1 control valve module is on the left
side. The T/R 2 control valve module is on the right side.
Training Information Point
You use the manual isolation valve handle to prevent accidental
operation of T/Rs when persons or equipment are near the T/R.
You put in a lock pin to keep the handle in the shutoff position.
The T/R deactivation for maintenance is different than the T/R
deactivation for airplane dispatch. Be sure to follow the airplane
maintenance manual (AMM) procedures.
WARNING: BEFORE YOU REMOVE THE LOCK PIN FROM THE
T/R CONTROL VALVE MODULE FOR THE THRUST
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