(b)
Remove the screws and washers that attach the antenna feedlines to the attach plate (View B, Fig. 401).
(c)
Remove the part of the leading edge from the airplane.
S 034-024
(4) If you remove the part of the leading edge that contains the bonding jumper, do the steps that follow:
(a)
Remove the fasteners around the part of the leading edge between BS 2280.2 and LE Sta 77.3 (View A, Fig. 401).
(b)
Lift the part of the leading edge sufficiently to get access to the bonding jumper, approximately 5 to 6 inches.
NOTE: The bonding jumper is forward of the leading edge
____
rib (View A, Fig. 401).
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747-400 MAINTENANCE MANUAL
(c)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
1) On the overhead circuit breaker panel,P7. a) 7E12, HF L b) 7E15, HF R
(d)
Disconnect the bonding jumper from the leading edge rib.
(e)
Remove the part of the leading edge from the airplane.
S 034-025
(5)
Remove the fasteners that are around the remaining parts of the leading edge.
S 034-022
(6)
Remove the remaining parts from the airplane.
NOTE: After you remove an adjacent part of the leading edge,
____ you can remove the remaining parts with the splice rib attached.
TASK 55-30-01-404-003
3. Install the Fin Leading Edge (Fig. 401)
____________________________
A. Standard Tools and Equipment
(1)
Access Panel Leverage Adapter, B20004-21
(2)
Meter - Bonding (Ref 20-22-01/601)
B. Consumable Materials
(1)
A00247 Sealant - BMS 5-95
(2)
B00184 Solvent - BMS 11-7
(3)
C00064 Alodine - 1000 (clear)
(4)
G00381 Paper - Abrasive, Aluminum Oxide, 180-grit
C. References
(1)
20-11-14/701, Metal Surfaces
(2)
20-22-01/601, Electrical Bonding
(3)
SOPM 20-50-11 Application of Aerodynamic Smoothing Sealant
(4)
20-51-01/201, Standard Torques
(5)
23-11-00/501 HF Communication System
(6)
51-21-04/701, Alodized Surfaces
(7)
51-31-01/201, Seals and Sealing
(8)
IPC 55-30-01 Fig. 1
D. Access
(1) Location Zone
321 Fin Leading Edge
E. Procedure
S 214-004
(1)
Make sure there is no damage to the splice ribs.
(2)
If there is damage, repair or replace the splice ribs.
S 964-026
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S 214-005
(3) Examine the nutplates and screws that attach the parts of the leading edge to the fin.
(a)
Replace the nuts or screws if it is necessary.
(b)
Attach the nutplates with rivets if the nutplates are loose.
S 434-032
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.
CAUTION: WHEN INSTALLING 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.
(4) When you install the bolts on the leading edge, the following can help:
NOTE: These suggestions are to make sure that the bolts can be
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