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78-34-00-012
Purpose
The sync lock has two purposes:
* Locks the sync shafts to prevent operation of the hydraulic
actuators when there is no T/R deploy signal
* A manual drive for the hydraulic actuators.
Location
A sync lock attaches to the head end of the lower hydraulic
actuator on each T/R half.
Physical Description
The sync lock is a mechanical lock which requires electrical
power to operate during normal T/R operation. The sync lock
has one electrical connector. The manual drive is on the
bottom. You use the manual drive to disengage the lock
mechanism. Electrical power is not always necessary when you
use the manual drive.
Functional Description
Without electrical power, the sync lock is in the lock position,
and the sync shafts cannot turn. The T/R hydraulic actuators
cannot operate.
During a T/R deploy operation, the internal solenoid energizes
and the sync lock clutch disengages (unlocks). The sync shafts
are free to turn and the hydraulic actuators can operate.
The sync lock solenoid de-energizes 18 seconds after a stow
command. This ensures that the translating sleeve has
sufficient time go to the stow position.
Refer to the T/R control system functional description pages of
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
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
　
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