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Page 38
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
78-31-00-017
THRUST REVERSER - RUBSTRIP
THRUST REVERSER - RUBSTRIP
EFFECTIVITY
GUN ALL 78-31-00
Page 39
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
78-31-00-017
Purpose
The bullnose seal prevents fan exhaust airflow into the inner
part of the T/R translating sleeve when the T/R is in the stow
position.
The bullnose retainer holds the bullnose seal to the acoustic
panel assembly.
Location
The bullnose seal and retainer are on forward end of the inner
wall structure of the translating sleeve. They are inboard of the
blocker doors.
The retainer attaches to the acoustic panel assembly. Grooves
in the retainer hold the bullnose seal in position.
You move the translating sleeves aft to get access to the
bullnose seal and retainer.
Functional Description
The bullnose seal compresses against the bullnose fairing
when the T/R is in the stow position. This prevents fan air
exhaust airflow into the inner part of the translating sleeve.
The center access panel supplies an exit for any air that gets
past the bullnose seal. This prevents damage to the sleeve
components if the seal fails. Refer to the access panel page in
this section for more information.
THRUST REVERSER - BULLNOSE SEAL AND RETAINER
EFFECTIVITY
GUN ALL 78-31-00
Page 40
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
78-31-00-018
THRUST REVERSER - BULLNOSE SEAL AND RETAINER
THRUST REVERSER - BULLNOSE SEAL AND RETAINER
EFFECTIVITY
GUN ALL 78-31-00
Page 41
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
78-31-00-018
Purpose
The fire seals keeps an engine fire in the turbine case area
away from these:
* T/R components
* Engine fan
* Components in the engine fan case area
* Engine strut.
Purpose
The fire seals help to contain an undercowl fuel-fed fire.
The upper rubber fire seals closes the gap between the strut
structure and the upper bifurcation inner walls. The lower
rubber fire seal closes the gap between the lower bifurcation
inner walls of the left and right thrust reverser halves.
The rubber fire seals also function as an aerodynamic seal and
a fluid seal. The fire seals must be able to perform the sealing
function ever when exposed to fuel, hydraulic fluid, engine oil,
alkaline based cleaning solutions, isopropyl alcohol based
deicing fluids and ethylene gycol based deicing fluids.
Location
All fire seals are along the upper and forward edges of the T/R
cowls (halves).
The upper bulb-seal fire seals are mounted in retainer tracks on
the inner surface of the upper bifurcation inner wall on the left
and right thrust reverser halves. These fire seals contact metal
seal depressors mounted on the strut.
The lower bulb-seal are mounted in retainer tracks on the inner
surface of the lower bifurcation wall on the left half. These fire
seals contact seal depressors mounted on the right half.
A bulb type fire/aerodynamic seal is mounted around the
circumference of the inner wall, aft of the inner wall v-blade. The
circumferential bulb-seal fire seals contact the engine case.
Physical Description
The rubber fire seals are constructed from a silicone rubber that
is reinforced with fabric layers. The rubber fire seals are bulbseals
that have a circular cross-section and foot that fits in a
metal seal retainer track. The bulb-seals can be hollow or can
be filled in some segments with a sponge foam to prevent
collapse of the seal where the seal fits in small radius curvature
turns. The rubber fire seals are also molded into specific
shapes for some areas.
THRUST REVERSER - FIRE SEALS
EFFECTIVITY
GUN ALL 78-31-00
Page 42
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
78-31-00-020
THRUST REVERSER - FIRE SEALS
THRUST REVERSER - FIRE SEALS
EFFECTIVITY
GUN ALL 78-31-00
Page 43
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