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between the primary hydraulic system and the standby system
exceeds 125 psi.
For example, hydraulic system A usually powers T/R 1. The left
shuttle valve will move if system A pressure goes 125 psi below
the standby system pressure. The standby hydraulic system
then supplies hydraulic power to the T/R 1 hydraulic control
module. The shuttle valve moves back when system A pressure
goes 125 psi above the standby system pressure.
The right shuttle valve selects the hydraulic power source for T/
R 2. Hydraulic system B is the normal source. Like T/R 1, the
standby system is the alternate source for T/R 2.
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THRUST REVERSER CONTROL SYSTEM - SHUTTLE VALVES
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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.
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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
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