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These are the effects when the arm solenoid remains energized
and hydraulic power is available to the T/R control valve
module:
* The hydraulic control valve adjacent to the arm solenoid
stays against its spring
* Hydraulic fluid keeps the HIV in the arm position
* Hydraulic power stays available at the directional control
valve (DCV)
* Hydraulic system pressure stays high at the rod side of the
T/R actuators.
This happens when the stow solenoid energizes:
* The hydraulic control valve adjacent to the stow solenoid
moves against its spring and hydraulic fluid flows through
the valve to the DCV
* The DCV moves from the deploy position to the stow position
(down)
* Hydraulic pressure at the head side goes low as the fluid
returns to the airplane hydraulic systems through the
manual shutoff valve and the DCV
* The hydraulic pressure at the rod side cause the actuators to
retract and stow the T/R.
Manual Shutoff Valve
The manual shutoff valve is normally open. You close it
whenever you do maintenance on or around the T/Rs.
See CONTROL VALVE MODULE, in this section for more
information about the T/R control valve module and the manual
shutoff valve handle.
One Way Flow Restrictors
The one-way restrictors restrict the mass flow rate of hydraulic
fluid to the T/R hydraulic actuators. They permit free hydraulic
flow from the T/R hydraulic actuators. This prevents a possible
hydraulic pressure build up across the head of the actuators
when the T/Rs are not in operation.
Internal Valve Position Sensors
The EAU uses the position sensors on the DCV and The HIV for
fault detection. See the EAU page in this section for more
information.
Training Information Point
There is no hydraulic return to the standby system for T/R 1.
There is a transfer of hydraulic fluid from the standby system to
system A during stow if the standby system deploys the T/R.
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There is no similar transfer of hydraulic fluid for T/R 2 operation.
THRUST REVERSER CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - DEPLOY/STOW HYDRAULIC FLOW
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
78-34-00-300
THRUST REVERSER CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - DEPLOY/STOW HYDRAULIC FLOW
THRUST REVERSER CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - DEPLOY/STOW HYDRAULIC FLOW
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
78-34-00-300
General
The EAU face has a set of lights and switches for each T/R. A
placard near the bottom the EAU supplies BITE instructions.
T/R Control System Troubleshooting
The EAU BITE helps you do trouble-shooting of the T/R control
system. The EAU monitors these component inputs from each
T/R:
* Left and right sleeve stow proximity sensors
* Left and right sleeve lock proximity sensors
* Hydraulic isolation valve (HIV) position (inside the T/R
control valve module)
* Directional control valve (DCV) position (inside the T/R
control valve module)
* Voltage at both sync locks.
The EAU identifies a fault if an input is incorrect for the thrust
reverser command. For example, a sync lock may not receive
electrical power after the pilot commands a deploy operation.
The T/R DEPLOY FAULTS light comes on if a fault happens
during a deploy operation. The T/R STOW FAULTS light comes
on if a fault happens during a stow operation or after a stow
operation. Both lights are red.
The EAU also has a light for each component input. If a
component has a failure, then its light will stay on at the end of
the BITE. These lights are red.
This is a brief summary of the BITE procedure:
* You push and hold the T/R DEPLOY FAULTS button (switch)
to see deploy faults or
* Push and hold the T/R STOW FAULTS button (switch) to see
stow faults
* All lights come on for a test
* Lights which stay on show faults
* The green NO FAULTS DETECTED light comes on if there
are no faults found
　
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