54-51-02
ALL ú CONFIG 3 ú 10N Page 447 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
SPRING BEAM - REMOVAL/INSTALLATION
__________________________________
1. General_______
A. This subject has two tasks, one for the removal and one for the
installation of the spring beam.
B. Spring beams must be removed if the spherical bearings are to be examined or replaced.
C. Spring beams are not interchangeable between the left side and right side of the strut or between nacelle strut No. 1 and nacelle strut No. 4.
D. Spring beams must be tagged when removed to make sure that the beam is installed in the same position as removed.
TASK 54-51-03-004-001
2. Remove the Spring Beam (Fig. 401)______________________
A. References
(1)
AMM 54-51-01/401, Nacelle Strut
(2)
AIPC 54-51-03 Fig. 2
B. Access
(1)
Location Zone
452 Nacelle Strut 1 . Torque Box
454 Nacelle Strut 1 . Aft Fairing
482 Nacelle Strut 4 . Torque Box
484 Nacelle Strut 4 . Aft Fairing
(2)
Access Panel 452GL Left Spring Beam Bearing Panel - Nacelle Strut 1 452FR Right Spring Beam Bearing Panel - Nacelle Strut 1 482GL Left Spring Beam Bearing Panel - Nacelle Strut 4 482FR Right Spring Beam Bearing Panel - Nacelle Strut 4
C. Procedure
S 034-002
(1) Disconnect the nacelle strut (AMM 54-51-01/401).
S 864-048
CAUTION: MAKE SURE THE DUCTS AND PLUMBING ARE DISCONNECTED AND THAT THE
_______ WIRING IS LOOSE BEFORE YOU LOWER THE STRUT. FAILURE TO DO THIS CAN CAUSE DAMAGE TO STRUT SYSTEMS AND COMPONENTS.
(2) Lower the nacelle strut approximately 10 inches (254 mm).
NOTE: Spring beam removal can be done without disconnecting
____ the electrical harness from the strut. You must remove all of the clamps from the electrical harness for approximately 5 feet along the wing front spar. This will supply sufficient free electrical harness for the strut to be lowered approximately ten inches.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. OUTBOARD STRUTS ú
54-51-03
ú ú 02 Page 401 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
SEE A
A
SEE B
SPRING BEAM ACCESS PANEL
OUTBOARD STRUT A
BULKHEAD BEARING FITTING SPRING BEAM SEE G
STRUT STRUCTURE
SPACER
SPACER
FWD
BEARING
BOLT
STRUT SKIN SPHERICAL BEARING
STRUT STRUCTURE
SCREW WASHER(7 PLACES)
SPRING BEAM
ACCESS PANEL
B
____LEFT SIDE INSTALLATION SHOWN.
NOTE: RIGHT SIDE INSTALLATION SIMILAR.
Spring Beam Installation Figure 401 (Sheet 1)
SPRING BEAM
VAPOR BARRIER
SEE D
A
SPRING BEAM
COTTER PIN
NUT
WASHER
FUSE PIN BUSHINGS
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. OUTBOARD STRUTS ú
54-51-03
ú ú 02 Page 402 ú Jun 10/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
BEARING
FITTING BOLT SEE
C
A-A
BEARING ACCESS DOOR
STRUT
SKIN
(REF)
LARGE SLOTS(2 PLACES)
SPRING BEAM BEARING
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