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EFFECTIVITY
GUN ALL 78-34-00
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D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
78-34-00-006
THRUST REVERSER CONTROL SYSTEM - THRUST REVERSER SLEEVE LOCK PROXIMITY SENSOR
THRUST REVERSER CONTROL SYSTEM - THRUST REVERSER SLEEVE LOCK PROXIMITY SENSOR
EFFECTIVITY
GUN ALL 78-34-00
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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
78-34-00-006
Purpose
The thrust reverser sleeve stow proximity sensor supplies a
stow/not stowed signal to the engine accessory unit (EAU).
The EAU uses this signal for these functions:
* Normal T/R stow control
* Auto-restow control
* Fault logic and fault indication
* Fault isolation.
Refer to the functional description in this section for more
information about how the EAU uses this input.
See the thrust reverser indicating system section for more
information about T/R fault indication. (SECTION 78-36)
Location
The sensor is on the forward face of the T/R torque box. The
target crank assembly is also on the forward face of the T/R
torque box. Each T/R sleeve has a sensor and a target. You
open a fan cowl to get access to a sensor and its target.
General
Each sensor has two output levels. One level for the stow
position, the other level for the not stowed position. The
sensor’s output changes when the sensor’s target is close
(near).
The target is part of a crank. Two small torsion springs put a
force on the crank. A plunger, on the T/R translating sleeve,
keeps the target away (far) from the sensor when the sleeve is
in the stow position.
Functional Description
The EAU supplies excitation to the sensor. The EAU sees a
large change in the sensor’s output when the sensor’s target is
close (near).
The target moves close (near) to the sensor when the T/R
sleeve moves out of the stow position during a T/R deploy
operation. This is why the target moves:
* The plunger moves away from the crank’s roller as the T/R
translating sleeve moves aft
* The small torsion springs supply a force to the crank,
opposite to the plunger’s force
* The crank turns and the target moves close (near) to the
sensor.
The target stays in the near position until the sleeve comes back
to the stow position and the plunger turns the crank.
The output of the sensor stops changes because its target is
away (far).
THRUST REVERSER CONTROL SYSTEM - THRUST REVERSER SLEEVE STOW PROXIMITY SENSOR
EFFECTIVITY
GUN ALL 78-34-00
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D633A101-GUN Jun 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
78-34-00-012
THRUST REVERSER CONTROL SYSTEM - THRUST REVERSER SLEEVE STOW PROXIMITY SENSOR
THRUST REVERSER CONTROL SYSTEM - THRUST REVERSER SLEEVE STOW PROXIMITY SENSOR
EFFECTIVITY
GUN ALL 78-34-00
Page 17
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
78-34-00-012
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
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