(2)  
Access Panel
 452FR Access Door - Nacelle Strut 1
 452GL Access Door - Nacelle Strut 1
 482FR Access Door - Nacelle Strut 4
 482GL Access Door - Nacelle Strut 4
 521FT Wing Leading Edge Cover - Nacelle Strut 1
 621FT Wing Leading Edge Cover - Nacelle Strut 4

 C. Procedure
 S 496-011
 WARNING:_______LEADING EDGE FLAPS ARE FAST ACTING. LOCKS SHOULD BE INSTALLED TO PREVENT POSSIBLE INJURY DUE TO INADVERTENT OPERATION OF FLAPS.
 (1)  
Extend leading edge flaps and install leading edge flap drive unit lock (AMM 27-81-00/201).

 S 286-017

 (2)  
Do a check of the spring beam bearing.

 NOTE: You can get access to the spring beam through the wing
____ leading edge panels or through the spring beam bearing access doors.
 (a)  Remove the wing leading edge cover, 521FT or 621FT, or remove the spring beam bearing access doors, 452FR and 452GL or 482FR and 482GL.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. OUTBOARD STRUTS ú

 54-51-03
 ú ú 02 Page 606 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 WARNING: DO NOT PUT YOUR FINGERS BETWEEN THE SPRING BEAM AND THE
_______ STRUT BEAM SUPPORT FITTING. MOVEMENT OF THE SPRING BEAM CAN CAUSE INJURY.
 (b)  Do a check for movement between the spring beam and the strut beam support fitting. 1) Put your fingers on the gap between the spring beam and the
 strut beam support fitting. 2) Push on the engine with your hand to shake the engine and strut laterally. 3) If you do not feel motion between the spring beam and the strut beam support fitting, remove and replace the bearing.
 CAUTION: MAKE SURE THAT YOU REMOVE TOOLS AND UNWANTED MATERIAL FROM
_______ THE STRUT CAVITY BEFORE YOU INSTALL THE WING LEADING EDGE COVER. THESE ITEMS CAN BLOCK THE STRUT DRAINS AND CAUSE DAMAGE TO THE STRUT.
 (c)  Install the access panel(s) that you removed.
 S 096-016
 WARNING: LEADING EDGE FLAPS ARE FAST ACTING AND CAN CAUSE
_______
 SERIOUS INJURY TO PERSONNEL.

 (3)  Remove the leading edge flap drive unit lock and retract the leading edge flaps (AMM 27-81-00/201).
 TASK 54-51-03-206-018
 4. Spring Beam Bearing Radial Freeplay Check (Fig. 601)
_________________________________________
 A. References
 (1)  
AMM 54-51-03/401, Spring Beam

 (2)  
OHM 54-00-01, Nacelle Strut to Component

 B. Procedure
 S 016-020
 (1)  Remove the spring beam (AMM 54-51-03/401).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. OUTBOARD STRUTS ú

 54-51-03
 ú ú 01 Page 607 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
 (2)  S 226-019Do a check of the spring beam bearing radial freeplay. (a) If the radial freeplay is equal to or less than 0.0110 inch (0.2794 mm), the bearing is acceptable. (b) If the radial freeplay is greater than 0.0110 inch (0.2794 mm), replace the bearing (OHM 54-00-01).
 (3)  S 416-021Install the spring beam (AMM 54-51-03/401).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. OUTBOARD STRUTS ú

 54-51-03
 ú ú 01 Page 608 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 ENGINE ATTACH FITTINGS - DESCRIPTION AND OPERATION
__________________________________________________
 1.  General_______(Fig. 1.)
 A.  Forward and aft engine mounts are made of steel alloy. These fittings are designed to allow for thermal expansion of the engine and permit engine removal and installation with standard tools.
 (1)  
　
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機維護手冊 NACELLES/PYLONS(45)