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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
78-31-00-001
THRUST REVERSER - GENERAL DESCRIPTION
THRUST REVERSER - GENERAL DESCRIPTION
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
78-31-00-001
THIS PAGE IS INTENTIONALLY LEFT BLANK
THRUST REVERSER - GENERAL DESCRIPTION
78-31-00
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D633A101-GUN Feb 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
Each thrust reverser has two halves. These are the thrust
reverser components on each half:
* Translating sleeve
* Hydraulic actuators
* Sync shafts
* Cascade segments
* Blocker doors
* Blocker door drag links
* Opening actuator
* Krueger flap deflector (inboard halves only)
* Rubstrip
* Tension latches
* Fire seals
* Insulation blanket
* Torque box, innerwall and aft cascade support ring
* Access doors
* Upper main track slider
* Lower main track slider
* Main track liner
* Auxiliary track liner
* Upper auxiliary track slider
* Lower auxiliary track slider
* Bullnose seal and retainer.
Thrust Reverser
The thrust reverser is made of three major components; the
translating sleeve, the fan duct cowl, and the aft cowl. The inner
surface of the translating sleeve and the outer surface of the fan
duct cowl forms the fan duct for the fan air exhaust. A crosssection
view thru the thrust reverser, aft of the fan, shows a
reduction in cross sectional area over the length of the fan duct;
this feature is used to create thrust from the fan exhaust air.
Thrust Reverser Fan Duct Cowl
The fan duct cowl is part of the thrust reverser assembly. There
are a left and right fan duct cowl for each engine. The fan duct
cowl assembly consists of the following: a one piece inner wall
with upper and lower bifurcation and acoustic features, the
forward torque box, the cascade aft attachment ring, the
cascade segments, the upper hinge and track beam, the lower
latch and track beam, the opening actuator attachment fittings
and the main and auxiliary tracks and track liners for the
translating sleeve.
The cascade segments and inner wall are made of composite
materials. The torque box and upper hinge beam and lower
latch beam are made of aluminum.
THRUST REVERSER - COMPONENT LOCATION
EFFECTIVITY
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D633A101-GUN Feb 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
78-31-00-002
The inner wall forms part of the fan duct of the thrust reverser.
The inner wall is a large one-piece composite structure that
forms the upper bifurcation, the cowl that covers the engine
core, and the lower bifurcation. On the airflow side, the inner
wall has acoustic features. The hinge beam is attached to the
upper bifurcation and the latch beam is attached to the lower
bifurcation.
The fan duct inner wall is a composite structure with the drag
link anchor fittings, lower bifurcation compression pad fittings
and upper bifurcation compression receiver fittings. The
aluminium hinge beam is attached to the inner wall upper
bifurcation. The aluminium latch beam is attached to the inner
wall lower bifurcation. The fan duct inner wall is covered with a
corrosion resistant steel (CRES) faced thermal insulation
blanket and fire barrier. The inner wall also has blocker door
drag link fittings, the upper and lower bifurcation fire seals,
vertical fire seals and engine core v-blade, the upper bifurcation
compression cups and lower bifurcation compression pads.
Most of the inner wall is made of honeycomb composite
materials.
The torque box is a semi-circular structure that connects the
upper hinge beam and the lower latch beam. The torque box
also has a v-blade that engages the v-groove in the engine fan
case. The hydraulic locking and non-locking actuators are
installed through the torque box and the forward actuator
gimbals are pinned to fittings on the torque box. The deploy and
retract hydraulic tubing are located by tubing clamps mounted
on the torque box. Wire bundles for the rotary variable
differential transducer (RVDT), the proximity sensors on the
locking actuators and the sync lock/manual drive unit are
attached to the torque box with wire bundle clamps. The
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