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translation of the T/R sleeve.
See the thrust reverser indicating system section for more
information about the LVDT. (SECTION 78-36)
There are two sync shafts on each T/R half.
Location
The locking actuators are the top actuators on each T/R half.
The two non-locking actuators are below the locking actuators.
All actuators attach to the torque box and to the translating
sleeve.
You open the fan cowl and move the translating sleeve aft to get
access to the hydraulic actuators.
The upper sync shaft is inside the deploy hydraulic tube,
between the upper and center actuators. The lower sync shaft is
inside the deploy hydraulic tube, between the center and lower
actuators. The deploy tubes are larger than the stow tubes. You
open the fan cowl to get access to the tubing.
Training Information Point
You use the sync lock to manually operate the hydraulic
actuators and sync shafts.
See the thrust reverser control system section for more
information about the sync lock. (SECTION 78-34)
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
There are two types of T/R hydraulic actuators:
* Locking
* Non-locking.
Each T/R half has one locking actuator and two non-locking
actuators. The locking actuators have a feedback mechanism
and a manual unlock lever.
The feedback mechanism operates the linear variable
differential transformer (LVDT). The LVDT supplies translating
sleeve position data to the indicating system. See the thrust
reverser indicating system section for more information.
(SECTION 78-36)
The manual unlock lever lets you manually unlock the locking
actuator. The manual unlock lever is also a target for the T/R
sleeve lock sensor. See the thrust reverser control system
section for more information about this sensor.
(SECTION 78-34)
Location
The locking actuators are near the top of each T/R half. The two
non-locking actuators are below the locking actuators. All
actuators attach to the torque box at the forward end and to the
translating sleeve at the aft end.
You open the fan cowl and move the translating sleeve aft to get
access to the hydraulic actuators.
Physical Description
All of the hydraulic actuators have these parts and connections:
* Extend (deploy) pressure port
* Retract (stow) pressure port
* Gimbal assembly
* Sync shaft and tubing connections.
The locking actuators also have these components:
* Manual unlock lever
* Position feedback mechanism
* Internal lock mechanism.
Hydraulic pressure at the extend port unlocks the locking
actuator during normal T/R operation. You can use the manual
unlock lever to unlock the actuator for a manual translation of a
sleeve.
Pressure Ports
The T/R control valve controls the hydraulic power to the
actuators. Hydraulic fluid goes to the extend and retract
pressure ports of each actuator during a deploy operation.
Hydraulic power unlocks the locking actuator so it can operate.
All actuators extend and move the translating sleeve aft.
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The T/R control valve sends hydraulic fluid to the retract
pressure ports of each actuator during a stow operation. With
hydraulic pressure at these ports, the actuators retract and
move the translating sleeve forward. The hydraulic fluid at the
extend port returns through the hydraulic control valve module
　
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