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each translating sleeve for control. The EAU also interfaces with
the T/R indicating system to control the REVERSER light.
T/R Indicating System
The T/R indicating system supplies these indications in the
flight compartment:
* REV message on common display system (CDS)
* REVERSER light on the P5 aft overhead panel
* Linear variable differential transformer (LVDT) data on the
control display unit (CDU).
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The common display system (CDS) shows the REV message.
This message refers to the positions of a T/R’s translating
sleeves. Each T/R has LVDTs which supply translating sleeve
position data to the electronic engine control (EEC).
When on, the REVERSER light shows that there is a failure in
one of these areas:
* T/R control system
* Mechanical failure which prevents the control system from
correct operation.
The REVERSER light comes on for 10 seconds during a T/R
stow operation. The light will stay on if the T/R does not stow in
10 seconds. The EAU controls this light.
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THRUST REVERSER SYSTEM - GENERAL DESCRIPTION
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The thrust reverser (T/R) system controls the direction of
engine fan air exhaust for forward and reverse thrust.
Reverse thrust helps decrease the speed of the airplane after
landing or during a rejected take off (RTO).
THRUST REVERSER - INTRODUCTION
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General
The T/R is a translating sleeve and cascade design. Each T/R
has a left and right fan duct half with a translating outer wall
(sleeve). The two sleeves on each T/R work at the same time.
However, the sleeves are independent of each other.
Each T/R half has these components:
* Translating sleeve
* 3 Hydraulic actuators and 2 sync shafts
* 6 Cascades
* 5 Blocker doors
* 5 Blocker door drag links
* 1 T/R opening actuator
* Torque box
* Fan duct inner wall
* 3 Access doors
* Upper and lower sliders and tracks.
The sleeves are in the stow position when they are in the full
forward position. The sleeves are in the deploy position when
they are in the full aft position. The sleeves have sliders which
let the sleeves move forward and aft in tracks.
Each blocker door drag link attaches a blocker door to the inner
duct.
Functional Description
The T/R control system uses the hydraulic actuators to move
the translating sleeves. The sleeves move aft of the cascades
during a deploy operation.
Each drag link permits its blocker door to move into the fan air
exhaust flow as the sleeve move aft.
The blocker doors change the direction of the fan air exhaust
out through the cascades. This causes reverse thrust. The
cascades do not move.
See the thrust reverser control system section for more
information about T/R control. (SECTION 78-36)
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