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airplane altitude information. An air sensing relay supplies the
air/ground logic. The fire handle must be down for the control
system to use the electrical power.
Each T/R control valve module controls hydraulic power to
deploy or stow their T/R. Each module contains the electrical
and hydraulic components necessary to control the hydraulic
flow to the T/R hydraulic actuators. There are two T/R control
valve modules on the airplane. One for each T/R.
Sync shafts on each translating sleeve make sure the sleeve’s
three actuators operate at the same speed. The actuators can
operate only if the shaft is free to turn.
A sync lock connects to the bottom hydraulic actuator on each
T/R half. The sync lock must unlock for the sync shafts to turn.
During normal T/R operation, the sync locks energize to unlock.
The sync lock is also a manual drive mechanism. You use the
sync lock to manually move the T/R translating sleeves for
maintenance operations.
The engine accessory unit (EAU) has the electrical circuits
necessary for stow operation. The EAU also uses input from
sleeve proximity sensors for auto-restow logic.
The reverser thrust levers operate switches on the autothrottle
switch packs. These switches control signals to these
components:
* 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
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
78-34-00-001
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.
THRUST REVERSER CONTROL SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 78-34-00
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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
78-34-00-001
THRUST REVERSER CONTROL SYSTEM - GENERAL DESCRIPTION
THRUST REVERSER CONTROL SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 78-34-00
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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
78-34-00-001
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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