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fix the deploy problem and reset the engine accessory unit
(EAU).
THRUST REVERSER INDICATING SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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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
the ENGINE CONTROL light. An ENGINE CONTROL light comes
on when any two of these conditions are true for a T/R:
* The left translating sleeve position signal (from the LVDT) is
not in range
* The right translating sleeve position signal (from the LVDT)
is not in range
* The left translating sleeve position signals (from the LVDT)
do not agree
* The right translating sleeve position signals (from the LVDT)
do not agree.
Control Display Unit (CDU)
You can see LVDT real time data and failure messages on the
control display unit (CDU). See the engine indicating chapter for
more information about how the CDU helps you do troubleshooting.
(CHAPTER 77)
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EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
78-36-00-001
THRUST REVERSER INDICATING SYSTEM - GENERAL DESCRIPTION
THRUST REVERSER INDICATING SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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78-36-00-001
REVERSER Lights
The amber REVERSER lights are on the engine panel. This
panel is on the P5 aft overhead panel in the flight compartment.
ENGINE CONTROL Lights
The amber ENGINE CONTROL lights are on the engine panel.
REV Messages
The REV messages show on the common display system
(CDS). The message shows just above the engine N1 indicator.
Control Display Units
The control display units (CDUs) are on the P9 panel in the flight
compartment. The CDUs are on the left and right side of the
lower center display unit.
THRUST REVERSER INDICATING SYSTEM - COMPONENT LOCATION - FLIGHT COMPARTMENT
EFFECTIVITY
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THRUST REVERSER INDICATING SYSTEM - COMPONENT LOCATION - FLIGHT COMPARTMENT
THRUST REVERSER INDICATING SYSTEM - COMPONENT LOCATION - FLIGHT COMPARTMENT
EFFECTIVITY
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78-36-00-002
Purpose
The linear variable differential transformer (LVDT) supplies T/R
sleeve position data to the electronic engine control (EEC).
The EEC uses the LVDT signal for these functions:
* Control the REV message on the common display system
(CDS)
* Control the ENGINE CONTROL light (aft P5)
* LVDT failure isolation through the control display units
(CDUs).
* Reverse thrust interlock control
* Engine forward and reverse thrust control.
See the functional description in this section for more
information about the REV message.
See the engine controls chapter for more information about the
reverse thrust interlock. (CHAPTER 76)
See the engine controls chapter for more information about how
the EEC controls engine thrust. (CHAPTER 76)
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