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THRUST REVERSER CONTROL SYSTEM - SHUTTLE VALVES
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
General
A deploy signal goes to the T/R control system when you raise
the reverse thrust levers. Electrical power controls the T/R
control valve module.
T/R control system logic prevents a T/R deploy operation when
the airplane is more than 10 feet (3 meters) from the ground.
This is a brief summary of what happens when you move the
left reverse thrust lever to the deploy position:
* The T/R control switch moves to the deploy position
* The switches in the autothrottle (A/T) switch pack move to
the deploy position
* The T/R sync lock (sl) latch relay energizes
* The sync locks energize and unlock
* The T/R sequence (seq) relay energizes after 0.1 seconds
* The arm and deploy solenoids energize
* The T/R control valve module sends hydraulic fluid to the
actuators to deploy the translating sleeves.
T/R 2 operates almost the same.
Sync Locks
The sync locks must unlock for the T/R hydraulic actuators to
operate. The synch locks energize to unlock. They receive dc
standby bus power through the T/R SL latch relay (RLY) after it
energizes to the deploy position.
T/R Control Valve Module
Each T/R control valve module has a deploy solenoid and arm
solenoid. Both solenoids must energize to send hydraulic
power to deploy its T/R. See T/R CONTROL - FUNCTIONAL
DESCRIPTION - HYDRAULIC FLOW for more information.
The deploy solenoid receives power from the dc standby bus
through the engine fire switch, and the control switch (SW). The
deploy solenoid finds an electrical ground through these
components:
* Sequence relay (SEQ RLY), and
* Flight control computer A (FCC A), or
* The air sensing relay (R584), or
* The radio altimeter (R/A) less than 10 ft B relay.
The arm solenoid receives power from the dc standby bus
through the fire switch. The arm solenoid finds an electrical
ground through these components:
* Arm SW
* Sequence relay (SEQ RLY), and
* Flight control computer A (FCC A), or
* The air sensing relay (R584), or
* The radio altimeter (R/A) less than 10 ft B relay.
THRUST REVERSER CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - DEPLOY CONTROL
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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T/R Sequence Relay and T/R Time Delay Module
The T/R sequence relay (SEQ RLY) energizes 0.1 seconds after
the right sync lock energizes. This gives the sync locks time to
unlock before the arm solenoid and deploy solenoid energize
and send hydraulic power to the T/R. The T/R sequence relay
finds an electrical ground through the T/R time delay module.
Flight Control Computer (FCC)
The FCC’s supply an electrical ground when the altitude of the
airplane is ten feet (3 meters) or less. FCC A supplies the
ground for T/R 1. FCC B supplies a ground for T/R 2.
Miscellaneous Electrical Equipment Panels (J22 and J24)
The miscellaneous electrical equipment panel (J22) is in the
fuselage, left of the nose gear wheel well.
The equivalent T/R 2 control system components are in the
miscellaneous electrical equipment panel (J24). The J24 is in
the fuselage, right of the nose gear wheel well.
THRUST REVERSER CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - DEPLOY 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
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THRUST REVERSER CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - DEPLOY CONTROL
THRUST REVERSER CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - DEPLOY CONTROL
EFFECTIVITY
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THRUST REVERSER CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - DEPLOY CONTROL
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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
　
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