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72-33-02
ALL ú ú C01 Page 403 ú Jul 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
TASK 72-33-02-404-006-C00
3. Forward Acoustical Panel Installation
_____________________________________
A. Equipment
(1) Protective Mats (two required) - Rubber
Manufacturer's Association, Grade SC43,
neoprene sponge, 1 inch thick, approximately 3
x 4 feet with warning streamers attached.
B. Consumable Materials
(1)
C00047 Sealant, silicone RTV and compatible primer (CP2242) -MIL-A-46106
(2)
D00601 Grease, graphite (CP2101) - SAE AMS2518
(3)
B01058 solvent, acetone, reagent grade (CP1039)
C. References
(1) CFMI Standard Practices Manual 70-66-12
D. Access
(1) Location Zones
501/601 Inlet and Cowl
506/606 Engine
E. Install the Forward Acoustical Panel
S 434-007-C00
(1) If it is necessary, attach the snap-fit fillet skin to the acoustical panel.
S 424-038-C00
CAUTION: THERE ARE TWO DIFFERENT TYPES OF FORWARD ACOUSTICAL PANELS; A
_______ HARDWALL TYPE AND A PERFORATED TYPE. A MIXED CONFIGURATION OF THE PANELS IS NOT IN CONFORMANCE WITH NOISE REGUALTIONS.
(2) Install the forward acoustical panel as follows (Fig. 401):
CAUTION: APPLY A LAYER OF GRAPHITE GREASE (CP2101) TO THE SCREWS.
_______ IF YOU DO NOT, DAMAGE TO THE EQUIPMENT CAN OCCUR.
(a)
Apply grease, SAE AMS2518 (CP2101), to all screws that hold the acoustical panels as follows: 1) Apply grease, SAE AMS2518 (CP2101), to the screw threads
and contact faces below the screw heads.
(b)
Put the acoustical panel on the fan case.
1) Slide the narrower end of the panel under the wider end of the adjacent panel.
(c)
Align the screw holes in the acoustical panel with the holes in the fillet skins.
(d)
Install the eight screws in the panel.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
72-33-02
ALL ú ú C02 Page 404 ú Nov 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
CAUTION:_______ IF YOU USE A PNEUMATIC OR ELECTRICAL SCREWDRIVER TO
TIGHTEN THE ACOUSTICAL PANEL SCREWS, MAKE SURE THE SPEED
IS NOT MORE THAN 200 RPM. IF THE SPEED IS MORE THAN 200
RPM, DAMAGE TO THE EQUIPMENT CAN OCCUR.
(e) As you tighten each screw, make sure the torque of the self locking nut is 4.5-31 pound-inches (0.5-3.5 Newton meters). 1) If the self locking nut torque is more than 31 pound-inches
(3.5 Newton meters), visually examine the installation to make sure the panel is seated correctly. a) If the panel is not correctly seated, find the cause
and correct it.
2) If the self locking nut torque is less than 4.5 pound-inches (0.5 Newton meters), do the steps below to lock the acoustical panel screw.
(f) Lock the acoustical panel screw as follows: 1) Clean screws and nuts with solvent, (CP1039). 2) Apply sealant RTV (CP2242) to the screw threads and contact
faces below the screw heads.
CAUTION: IF YOU USE A PNEUMATIC OR ELECTRICAL SCREWDRIVER TO
_______ TIGHTEN THE ACOUSTICAL PANEL SCREWS, MAKE SURE THE SPEED IS NOT MORE THAN 200 RPM. IF THE SPEED IS MORE THAN 200 RPM, DAMAGE TO THE EQUIPMENT CAN OCCUR.
(g) Torque the screws to 66-75 pound-inches (7.5-8.5 Newton meters). 1) Where it is possible, start at the screws in the center of
the acoustical panels.
S 394-043-C00
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