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* You release the button (switch)
* Lights that stayed on to show faults go out.
You use the FAULT RESET buttons (switches) to erase the EAU
fault memory. Deploy faults are reset only when the T/R is in the
deploy position. Refer to the procedures in chapter 78, part two
of the airplane maintenance manual (AMM) when you use the
EAU BITE.
The fault memory will erase when the T/R operates 5 times with
no faults.
The EAU FAULT light comes on if there is an internal EAU
failure.
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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).
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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
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