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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
78-34-00-200
THRUST REVERSER CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - STOW CONTROL
THRUST REVERSER CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - STOW CONTROL
EFFECTIVITY
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
78-34-00-200
General
The T/R control valve modules control hydraulic power to the
hydraulic actuators for T/R deploy and stow operations.
Hydraulic system A supplies hydraulic power for T/R 1. System
B supplies hydraulic power for T/R 2. The standby system
supplies backup hydraulic power through the shuttle valves if
system A or system B fails. See the shuttle valve page in this
section for more information.
The graphic shows T/R 1 operation. T/R 2 operation is almost
the same.
Deploy
The arm and deploy solenoids energize when you raise the
reverse thrust lever. See T/R CONTROL - FUNCTIONAL
DESCRIPTION - DEPLOY CONTROL in this section for more
information about the electrical circuit.
This happens when the arm solenoid energizes and hydraulic
power is available to the T/R control valve module:
* The hydraulic control valve adjacent to the arm solenoid
moves against its spring and hydraulic fluid flows through
the valve to the hydraulic isolation valve (HIV)
* The HIV moves to the arm position (up)
* Hydraulic power is made available at the directional control
valve (DCV)
* Hydraulic fluid goes through the open manual shutoff valve
to the rod side of the T/R actuators.
The deploy solenoid energizes after the sync lock receives a
signal to unlock. See the deploy control functional description
for more information.
This happens when the deploy solenoid energizes and
hydraulic power is available to the T/R control valve module:
* The hydraulic control valve adjacent to the deploy solenoid
moves against its spring and hydraulic fluid flows through
the valve to the DCV
* The DCV moves to the deploy position (up)
* Hydraulic fluid flows through the DCV to the head side and
the rod side of the T/R actuator pistons
* Each locking actuator’s mechanism disengages.
The hydraulic pressure on both sides of each actuator piston
are equal but the surface area of the head side is larger than the
rod side. The larger force on the head side causes the actuator
pistons to extend.
As the actuators extend, the fluid on the rod side of the
actuators goes to the manual shutoff valve and mixes with the
fluid which goes to the head side.
THRUST REVERSER CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - DEPLOY/STOW HYDRAULIC FLOW
EFFECTIVITY
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Page 36
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
78-34-00-300
Stow
The arm and stow solenoids temporarily energize when you
return the reverse thrust lever to the stow position. The deploy
solenoid de-energizes and the hydraulic control valve adjacent
to it returns to its normal position. See T/R CONTROL -
FUNCTIONAL DESCRIPTION - STOW CONTROL for more
information about the electrical circuit.
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
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