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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The thrust reverser (T/R) indicating system supplies this
indication data in the flight compartment:
* REV message on common display system (CDS)
* REVERSER fault light (aft P5)
* Linear variable differential transformer (LVDT) real time data
and failure data to the control display units (CDU)
* ENGINE CONTROL light (aft P5).
THRUST REVERSER INDICATING SYSTEM - INTRODUCTION
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
78-36-00-000
THRUST REVERSER INDICATING SYSTEM - INTRODUCTION
THRUST REVERSER INDICATING SYSTEM - INTRODUCTION
EFFECTIVITY
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
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THRUST REVERSER INDICATING SYSTEM - INTRODUCTION
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The thrust reverser (T/R) indicating system supplies T/R
translating sleeve position data to the common display
system (CDS). The REV message comes on as an indication
of translating sleeve position.
The T/R indicating system uses the REVERSER lights to show T/
R control system component failure.
The T/R indicating system can also bring on the ENGINE
CONTROL light to show T/R indicating system component
failure.
You use the CDU to see T/R indicating system component
failure data.
REV Messages
The REV messages show just above the engine N1 indicators
on the CDS. One message shows for each T/R.
The message shows in amber when one or both sleeves of a T/
R are between 10 to 90 percent of the travel to the deploy
position.
The message shows in green anytime both sleeves of a T/R are
more than 90 percent of the travel to the deploy position.
Each T/R translating sleeve has one linear variable differential
transformer (LVDT). The LVDT gives sleeve position data to the
engine electronic control (EEC).
The EEC and the display electronics units (DEUs) contain the
logic necessary to operate the REV message. The EEC supplies
a signal on an ARINC 429 bus to each display electronics unit
(DEU). The DEUs then show the message on the correct display
unit.
REVERSER Lights
Each T/R has an amber REVERSER light on the engine panel.
There is one light for each T/R. Master caution comes on after a
time delay whenever a REVERSER light comes on. The
REVERSER light can come on in flight.
The REVERSER lights come on for 10.5 seconds during a
normal T/R stow operation. A REVERSER light stays on if a T/R
control system component fails during the stow. The light stays
on until the stow failure goes away.
The REVERSER light comes on immediately during a deploy if a
T/R control system component fails. The light stays on until you
fix the deploy problem and reset the engine accessory unit
(EAU).
THRUST REVERSER INDICATING SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
78-36-00-001
The REVERSER light comes on when any of these T/R control
system component’s do not operate correctly for a stow or
deploy operation:
* Proximity sensor (2 each T/R sleeve)
* Sync lock
* Directional control valve (DCV) inside the T/R control valve
module
* Hydraulic isolation valve (HIV) inside the T/R control valve
module.
The engine accessory unit (EAU) contains the logic necessary
to identify T/R control system component failures. The EAU
controls the REVERSER lights.
ENGINE CONTROL Light
Each engine has an amber ENGINE CONTROL light on the
engine panel. This light comes on when a serious failure of an
engine or the T/R LVDT happens. You should not dispatch the
airplane with an ENGINE CONTROL light on. Master caution
also comes on with this light.
The T/R indicating system uses input from the LVDTs to control
　
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