A-A
Fin Access Doors and Openings Figure 2
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A
747-400 MAINTENANCE MANUAL
 FIN LEADING EDGE - REMOVAL/INSTALLATION
_______________________________________
 1.  General
_______
 A.  This procedure contains two tasks. The first task is the removal of the leading edge for the vertical stabilizer (fin). The second task is the installation of the fin leading edge.
 B.  The fin leading edge has four different parts. You can replace each part as one unit. The splice ribs attach the parts of the leading edge together.
 TASK 55-30-01-004-001
 2.  Remove the Fin Leading Edge (Fig. 401)
___________________________
 A.  Equipment
 (1)  
Access Panel Leverage Adapter, B20004-21

 (2)  
Safety Lanyard - 24MIT65B00002

 B.  References
 (1)  IPC 55-30-01 Fig. 1
 C.  Access
 (1)  Location Zone
 321 Fin Leading Edge

 D.  Procedure
 S 034-023
 WARNING: MAKE SURE THAT ALL PERSONS AND EQUIPMENT ARE AWAY FROM THE AREA
_______ BELOW THE LEADING EDGE. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR IF THE EQUIPMENT FALLS.
 WARNING: USE A MAN LIFT TO ATTACH THE SAFETY HARNESS FITTINGS TO THE
_______ RECEPTACLES. MAINTENANCE PERSONS CAN FALL WHICH MAY CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 WARNING: DO NOT WALK ON THE HORIZONTAL STABILIZER WITHOUT A SAFETY
_______ HARNESS. MAINTENANCE PERSONS CAN FALL WHICH MAY CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  Attach the Flight Control Safety Lanyard to the horizontal stabilizer (AMM 20-11-33/201).
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FIN LEADING EDGE SEE A
WEATHER SEAL
BODY STA
2280

BONDING JUMPER
FORWARD DORSAL TORQUE BOX FIN SKIN
A

747-400
MAINTENANCE MANUAL

0.09 |0.03 INCH
ACCESS DOOR SKIN CLEARANCE (EXAMPLE) A-A
LEADING EDGE
PARTS

HF ANTENNA A
SEE B
A
A

A
AUXILIARY SPAR CHORD
SPLICE RIB (4 LOCATIONS)
LE STA 77
FIN LEADING EDGE ACCESS DOOR A
ATTACHANTENNA SCREW AND FEEDLINE WASHER PLATE
HF ANTENNA COUPLER
HF ANTENNA B Fin Leading Edge Installation Figure 401
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747-400 MAINTENANCE MANUAL
 S 014-038 CAUTION: WHEN REMOVING PANEL FASTENERS, MAKE SURE THAT THE DRIVER BIT IS
_______ IN LINE WITH A FASTENER. THIS WILL PREVENT DRIVER BIT WOBBLE WHICH CAN CAUSE DAMAGE TO THE FASTENER RECESSES AND THREADS.
 (2)  When you remove the bolts from a leading edge panel, the following suggestions can help:
 (a)  
A leverage adapter, B20004-21,

 (b)  
A removal anti cam-out ribbed (ACR) bit,
 NOTE: The bit should have a hardness of 56-58 RC.

____
 NOTE: A combination removal/installation ACR bit is not

____
 recommended.

 CAUTION: ONLY APPLY FASTENER REMOVAL COMPOUND TO THE BIT IF NEEDED.
_______ CLEAN THE BIT AFTER EACH USE. DO NOT APPLY FASTENER REMOVAL COMPOUND TO THE FASTENER RECESSES, HOLES, OR THREADS. THIS CAN CAUSE DAMAGE TO THE FASTENERS.
 (c)  Apply a fastener removal compound on the driver bit if a fastener is difficult to remove.
 S 024-031
 (3)  If you remove the part of the leading edge that contains the high frequency (HF) antenna, do the steps that follow:
 (a)  
　
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