(2)
The spring beam bearing movement check consists of removing access panel, moving strut laterally by hand and checking for bearing movement, replacing bearing or bolt if seized, and installing access panel.
(3)
The spring beam bearing radial freeplay check consists of removing the spring beam, doing a check of the bearing radial freeplay, replacing the bearing if the limit is exceeded, and installing the spring beam.
TASK 54-51-03-226-001
2. Spring Beam Bolt Rotation Check (Fig. 601)_______________________________
A. Consumable Materials
(1)
A00247 Sealant - BMS 5-79
(2)
D00294 Grease - BMS 3-24
B. References
(1)
AMM 27-81-00/201 Leading Edge Flaps
(2)
AMM 54-51-03/401 Spring Beam
(3)
AMM 71-00-02/401 Power Plant
(4)
AIPC 54-51-03 Fig. 2
C. Access
(1)
Location Zone
452 Nacelle Strut 1 - Torque Box
482 Nacelle Strut 4 - Torque Box
(2)
Access Panel 452FR Spring Beam Bearing Access Panel - Nacelle Strut 1 452GL Spring Beam Bearing Access Panel - Nacelle Strut 1 521FT Wing Leading Edge Cover - Nacelle Strut 1 482FR Spring Beam Bearing Access Panel - Nacelle Strut 4 482GL Spring Beam Bearing Access Panel - Nacelle Strut 4 621FT Wing Leading Edge Cover - Nacelle Strut 4
D. Procedure
S 016-002
(1)
Do the procedure the remove the engine (AMM 71-00-02/401).
(2)
Remove the access panel for the spring beam bearing.
S 016-003
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. OUTBOARD STRUTS ú
54-51-03
ú ú 02 Page 601 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
A
SEE A
A
SPRING BEAM SEE B
FWD
OUTBOARD STRUT A
SPRING BEAM
STRUT STRUCTURE
WASHER
COTTER PIN
NUT
WASHER
WASHER
BEARING
BOLTSTRUT SKIN SPHERICAL BEARING
STRUT STRUCTURE FWDSCREW
WASHER
(7 PLACES)
SPRING BEAM
ACCESS PANEL
B
NOTE:LEFT SIDE INSTALLATION SHOWN. RIGHT SIDE INSTALLATION SIMILAR.
Spring Beam Bolt and Bearing Inspection Figure 601 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. OUTBOARD STRUTS ú
54-51-03
ú ú 02 Page 602 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
STRUT BEAM BOLT SUPPORT FITTING SEE
A-A
BEARING ACCESS DOOR
STRUT
SKIN
(REF)
LARGE SLOTS(2 PLACES)
SPRING BEAM BEARING
B-B
LUBRICATION FITTING
SPRING BEAM BEARING BOLT HEAD
Spring Beam Bolt and Bearing Inspection
Figure 601 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. OUTBOARD STRUTS ú
54-51-03
ú ú 02 Page 603 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 016-004
(3)
Remove the wing leading edge cover.
S 226-005
(4)
Do a check of the bearing bolt.
(a) Remove the cotter pin or retainer.
NOTE: This will make sure that the cotter pin does not
____ contact the retainer, and that the torque value is correct.
(b)
Apply a torque to the head of the bolt.
NOTE:____Use dial indicator type torque wrench. Preset or releasing type torque wrench will only respond to breakaway torque. Rotational torque requirement is after breakaway.
(c)
STRUTS WITH A SIDE BRACE; If the rotational torque after breakaway is 3000 pound-inches (342 N.m) or less, the bolt and fitting are acceptable.
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：747-400 AMM 飞机维护手册 NACELLES/PYLONS(43)
