747-400 AMM 飞机维护手册 NACELLES/PYLONS(20)

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 B.  Removal of attach pin/bolts consists of obtaining access, unloading pin/bolt to be removed, and removing pin/bolt. A brass slug should be used to push out the pin/bolt so the clevis and lugs remain aligned. Installation of attach pin/bolts consists of checking attach pins/bolts for corrosion, installing attach pin/bolt, and testing strut systems.
 (1)  The diagonal brace or upper link may be removed or replaced using this procedure by removing both forward and aft attach pins/bolts of the applicable link. Any cables or tubes clamped to the applicable link must be disconnected and installed again.
 C.  Anytime a fuse pin or secondary pin joint is disassembled, perform a subsequent detailed visual inspection of that joint within 1200 cycles or 18 months, whichever is earlier, to verify correct installation of hardware.
 D.  Care must be used to avoid the application of excessive lifting forces. A load cell must be used in the hoisting arrangement unless the crane incorporates an adjustable load limiter.
 E.  Observe the following precautions while performing attach pin/bolt removal/installation:
 (1)  
Electrical power must not be on during the time the fuel, hydraulic, and electrical lines are being disconnected from or connected to the strut.

 (2)  
During power plant removal or installation, all openings must be blanked off with approved caps. During power plant removal, all tube ends, ducts and electrical connectors must be capped as soon as possible after disconnection. During power plant installation, the caps must not be removed until connections are to be made. External caps must be used, not internal plugs.

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 54-51-02
 ALL  ú CONFIG 3 ú 10N Page 401 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 TASK 54-51-02-004-074-003
 2.  Remove the Attach Pin/Bolt__________________________
 A.  General
 WARNING: DO NOT REMOVE THE UPPER LINK AND THE DIAGONAL BRACE AT THE SAME
_______ TIME, UNLESS YOU WILL REMOVE THE STRUT. IF YOU REMOVE THE UPPER LINK AND THE DIAGONAL BRACE AT THE SAME TIME THE STRUT CAN MOVE DOWN AND CAUSE INJURY TO PERSONS OR DAMAGE TO THE STRUCTURE.
 (1)  Obey this warning during all of this task.
 B.  Special Tools and Equipment
 (1)  
A54001-138 Sling - Strut Unload, Pin Removal/Installation (Engine Supported)

 (2)  
G54004 - Overhead Mechanical Equipment, Inboard and Outboard Nacelle Strut Installation (Engine Removed; required if the midspar fuse pin is to be removed).

 (3)  
G54007 - Sling Diagonal Brace Preload (Engine Removed)

 (4)  
G54008-37 Removal/Installation Kit - Fuse Pin (Includes fuse pin adapter wrenches and brass slugs)

 C.  Standard Tools and Equipment
 (1)  
Lock - leading edge flap drive unit

 (2)  
Lift Equipment (Engine removed)

 (a)  
Crane, approved to lift 5,000 pounds

 (b)  
Dynamometer, 0-5,000 lb capacity, | 2% accuracy

 

 (3)  
Lift Equipment (Engine supported)

 (a)  
Crane, approved to lift 20,000 pounds, with micro-positioning capabilities (recommended), or with Pull Pac Cylinder (alternative) 1) Pull Pac Cylinder BRP-306, P-80 Pump, HC-941 Hose Assembly

 (alternative)
 ENERPAC, Division of Applied Power, Inc.
 Butler, Wisconsin

 (b)
Dynamometer, 0-20,000 pound capacity, | 2% accuracy

 

 1)  Two dynamometers are necessary if the crane has an adjustable load limiter or if you use a precision load positioner.
 2)  Three dynamometers are necessary if the crane does not have an adjustable load limiter and you do not use a precision load positioner.
 (c)  
Precision Load Positioner, 10 ton capacity, Model D Hydra-Set (alternative) Del Mar Engineering Laboratories, Hydra-Set Division International Airport Los Angeles, California

 (d)  
Lever Hoist, 9,000 pound capacity (2 are necessary)

 (4)  Tag Lines - use for control of the engine sling
 D.  References
 (1)  AMM 07-11-01/201, Jacking Airplane
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