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General
A stow signal goes to the T/R control system when you lower
the reverse thrust lever. Electrical power controls the T/R
control valve module.
This section shows T/R 1 operation. T/R 2 operation is this
same.
This is a brief summary of what happens when you return the
reverse thrust lever to the stow position after a T/R deploy
operation:
* The switches in the autothrottle (A/T) switch pack move to
the stow position
* A stow signal goes to the EAU through the stow switch
* The stow solenoid energizes
* The deploy solenoid de-energizes
* The arm solenoid finds an electrical ground inside the EAU
to stay energized
* The T/R control valve module sends hydraulic fluid to the
actuators to stow the translating sleeves
* The arm and stow solenoid de-energize after 10.5 seconds
* The sync locks go to the lock position after 18 seconds.
Sync Locks
The sync locks must unlock for the T/R hydraulic actuators to
operate. The sync locks energize to unlock. The sync locks
should have electrical power when the reverse thrust levers are
up.
Power at the sync locks stays on temporarily during the stow
operation. The T/R SL time delay relay (RLY) energizes 18
seconds after the T/R 1 SL switch moves to the stow position.
This supplies a ground for the T/R 1 SL latch RLY’s to energize.
This removes power from the sync locks. The sync locks deenergize
and lock.
T/R Control Valve Module
Each T/R control valve module has a stow solenoid and an arm
solenoid. Both solenoids must energize for the hydraulic power
to stow the T/R. See T/R CONTROL FUNCTIONAL
DESCRIPTION - HYDRAULIC FLOW for more information.
The stow solenoid receives power from the dc standby bus
through the T/R 1 stow switch and EAU logic circuits. EAU logic
completes the electrical circuit with one of these conditions:
* One or two translating sleeves on a T/R are not in the stow
position
* One or two translating sleeves on a T/R are out of the lock
position.
The output of the EAU logic also supplies an electrical ground
for the arm solenoid circuit.
The arm solenoid receives power from the dc standby bus
through the engine fire switch. The T/R arm switch and the EAU
logic complete the electrical circuit to ground.
THRUST REVERSER CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - STOW CONTROL
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
78-34-00-200
EAU Logic Circuit Output (Auto-Restow)
The EAU circuit logic output controls the operation of the arm
and stow solenoids for a T/R stow operation.
The stow logic output usually goes away when the EAU
receives a reset signal. Under normal operation, this happens
10.5 seconds after you lower the reverse thrust lever to the stow
position. With no logic output, the arm and stow solenoids deenergize
and hydraulic flow to the T/R’s actuators stop.
A logic output stays if the EAU has a sleeve unlocked or not
stowed signal 10.5 seconds after you command T/R stow.
Electrical power stays on at the arm and stow solenoids. This
keeps hydraulic pressure at the actuators to stow the T/R. The
output stays until one of these two sets of conditions happen:
* The EAU sees the sleeves stowed and locked and you push
the reset switch on the face of the EAU, or
* You operate the T/R and the EAU sees the sleeves stowed
and locked in less than 10.5 seconds after you command
stow.
The reset signal from the EAU reset switch will not remove the
logic output if the T/R sleeve proximity sensors still show an
unlocked or not stowed condition.
A logic output will happen under these conditions:
* The reverse thrust levers have been in the stow position for
more than 10.5 seconds
* The EAU receives a sleeve not stowed or sleeve not locked
signal.
The arm and stow solenoids energize and the T/R control valve
module sends hydraulic power to stow the T/R. The output stays
until one of these two sets of conditions happen:
* The EAU sees the sleeves stowed and locked and you push
the reset switch on the face of the EAU, or
* You operate the T/R and the EAU sees the sleeves stowed
and locked in less than 10.5 seconds after you command a
stow operation.
THRUST REVERSER CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - STOW CONTROL
EFFECTIVITY
GUN ALL 78-34-00
Page 34
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
　
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