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* EAU
* Sync locks
* Control valve module.
Deploy Operation
This happens when you raise the reverse thrust lever to deploy
a T/R:
* Switches in the autothrottle switch pack move to energize the
sync lock and an arm signal goes through the T/R control
valve module
* The T/R control switch moves and a deploy signal goes
through the T/R control valve module
* The T/R control valve module sends hydraulic fluid to the
actuators to move the translating sleeves aft.
THRUST REVERSER CONTROL SYSTEM - GENERAL DESCRIPTION
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See the engine controls chapter for more information about the
thrust lever interlock system. (CHAPTER 76)
A flight control computer (FCC) or one of two relays in the nose
wheel well area (J22, J24) supply an electrical ground
necessary to deploy the T/Rs. Deploy hydraulic power can not
go to the T/R if the air/ground or altitude conditions are not met.
Stow Operation
This happens when you lower the reverse thrust lever back to
the stow position:
* The T/R control switch removes the deploy signal to the T/R
control valve module
* The engine accessory unit (EAU) auto-restow circuits test
* Switches in the autothrottle switch pack move to send an arm
signal and a stow signal through the EAU to the T/R control
valve module
* The T/R control valve module sends hydraulic fluid to the
actuators to move the translating sleeves back to the stow
position.
* The sync locks go to the lock position after 18 seconds.
Auto-Restow
The EAU uses internal logic (auto-restow) to tell the T/R control
valve module to stow the T/R anytime these conditions happen:
* The EAU receives input from a proximity sensor on a sleeve
that the sleeve is not in the stow or locked position, and
* The engine’s reverse thrust lever for that T/R is in the stow
position.
The EAU use proximity sensors for the auto-restow logic. The
auto-restow circuits usually operate for 10 seconds during
normal T/R stow operation.
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EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
78-34-00-001
THRUST REVERSER CONTROL SYSTEM - GENERAL DESCRIPTION
THRUST REVERSER CONTROL SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
78-34-00-001
General
The thrust reverser (T/R) control components are at these areas
of the airplane:
* Upper and lower control stand
* EE compartment
* T/R halves
* Main gear wheel well.
The graphic shows the general location of the control system
components. Refer to the component page to see exact
location.
THRUST REVERSER CONTROL SYSTEM - COMPONENT LOCATIONS
EFFECTIVITY
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THRUST REVERSER CONTROL SYSTEM - COMPONENT LOCATIONS
THRUST REVERSER CONTROL SYSTEM - COMPONENT LOCATIONS
EFFECTIVITY
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78-34-00-002
Purpose
The arm and stow switches control the arm and deploy signals
to the T/R control system. The system uses these signals to
control hydraulic power to the T/R.
The sync lock switches control power to the circuits which
control sync lock power.
Location
All of the switches are in the autothrottle (A/T) switch packs,
below the flight compartment aisle stand. There are two switch
packs. The switch packs are between the two A/T servo
mechanisms.
You go through the lower nose compartment access door to get
access to the A/T switch packs. You must remove the A/T pack
to get access to any of the switches.
General
The arm switch supplies electrical power to the arm solenoid in
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