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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
78-31-00-005
Purpose
The blocker doors change the direction of the fan air exhaust
flow during a T/R deploy operation.
The blocker doors make part of the fan duct outer wall when the
T/R is in the stow position.
The blocker door drag links connect the blocker doors to the fan
duct inner wall.
Location
The blocker doors are part of the translating sleeve. They are
usually smooth with the inner contour of the translating sleeve.
The blocker door drag links are in the fan duct.
Physical Description
Each translating sleeve has five graphite-epoxy blocker doors.
There are three different sizes of blocker doors on each sleeve.
Two hinges connect each blocker door to the forward end of the
inner sleeve. The blocker door drag links connect the blocker
doors to the fan duct inner wall. A cover goes over the drag link
to blocker door attachment. Numbers identify blocker door
location.
Functional Description
Each translating sleeve moves aft during a T/R deploy
operation. This movement causes the blocker doors to move
into the fan duct. The fan air exhaust changes direction and
exits through the cascades. This helps create reverse thrust.
Training Information Point
You must move the translating sleeve aft to inspect or work on
the blocker door and the blocker door drag links.
You must open the T/R half to inspect the blocker door drag link
connections at the fan duct inner wall.
WARNING: DO THE DEACTIVATION PROCEDURE TO
PREVENT THE OPERATION OF THE THRUST
REVERSER. THE ACCIDENTAL OPERATION OF
THE THRUST REVERSER CAN CAUSE INJURY TO
PERSONS AND DAMAGE TO EQUIPMENT.
WARNING: DO NOT GO INTO THE FAN DUCT WHEN THE
THRUST REVERSER IS IN THE OPEN POSITION.
YOUR WEIGHT CAN CAUSE THE HOLD OPEN ROD
FOR THE THRUST REVERSER TO BREAK. INJURY
TO YOU AND DAMAGE TO THE EQUIPMENT CAN
OCCUR.
CAUTION: DO NOT PULL ON THE BLOCKER DOOR DRAG
LINKS OR USE THE DRAG LINKS FOR SUPPORT.
YOU CAN DAMAGE THE DRAG LINKS.
THRUST REVERSER - BLOCKER DOORS AND BLOCKER DOOR DRAG LINKS
EFFECTIVITY
GUN ALL 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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
78-31-00-006
THRUST REVERSER - BLOCKER DOORS AND BLOCKER DOOR DRAG LINKS
THRUST REVERSER - BLOCKER DOORS AND BLOCKER DOOR DRAG LINKS
EFFECTIVITY
GUN ALL 78-31-00
Page 23
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
78-31-00-006
THIS PAGE IS INTENTIONALLY LEFT BLANK
THRUST REVERSER - BLOCKER DOORS AND BLOCKER DOOR DRAG LINKS
78-31-00
Page 24
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
Purpose
You use the T/R opening actuator to open the T/R cowl (half).
Each engine has two T/R opening actuators. Each actuator
opens its cowl to approximately 45 from the closed position.
Location
Each T/R opening actuator is on the forward face of its T/R cowl.
The upper end of the T/R opening actuator attaches to the T/R
cowl. The lower end attaches to the engine fan frame extension
ring. You open the fan cowls to get access to the T/R opening
actuators.
Physical Description
The T/R opening actuator has these components:
* Hydraulic piston housing
* Rod
* Lock collar mechanism
* Inlet fitting
* Internal snubber assembly.
The rod extends approximately 12 inches (30.5 cm). The inlet
fitting permits you to connect a hand pump necessary to
operate the actuator.
Functional Description
Fluid from the hand pump causes the T/R opening actuator rod
to extend and open the T/R cowl. As the actuator approaches
the full extend position, the lock collar goes into the lock
position. A red band on the rod shows when the collar in the
lock position.
Fluid goes from the opening actuator back to the hand pump
when you close the T/R cowl.
Operation
There are two procedures to open the T/R’s. The pump
procedure is the best. You use the manual procedure only if
no pump is available.
You usually use a hand pump to operate the T/R opening
actuator. As the rod extends, the T/R cowl opens and the lock
collar moves into the lock position. You can see and hear the
lock collar move to the lock position. The red band confirms the
　
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