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747-400
MAINTENANCE MANUAL

 (2) Rivets - BACR15CE5D (or equivalent)
 B. Consumable Materials
 (1)
C00064 Alodine 1000 (clear)

 (2)
A00247 Sealant, BMS 5-95

 C. References
 (1)
20-22-01/601, Electrical Bonding

 (2)
51-21-04/701, Alodized Surfaces

 (3)
51-31-01/201, Seals and Sealing

 (4)
IPC 55-30-04 Fig. 1

 D. Access
 (1)  Location Zone
 327 Fin Tip

 E. Procedure
 S 434-006
 (1)
Remove the cover from the closure rib and equipment.

 S 214-007

 (2)
Examine the rib splice between the leading edge and the fin tip.

 (a) If there is damage, repair or replace the splice rib.
 S 214-008
 (3) Examine the nutplates and screws that attach the fin tip to the fin.
 (a)
Replace the damaged nuts and screws.

 (b)
Tighten the loose nutplates with new rivets.

 S 424-009
 (4)
Put the fin tip in the correct position.

 S 434-021

 (5)
Install the fasteners around the edge of the fin tip.

 S 354-010

 (6)
If you install a new fin tip, do the steps that follow:

 (a) Cut the lower edge of the fin tip skin.
 NOTE: Make sure you have the correct clearance between the
____ lower edge of the fin tip and the fin (View A-A, Fig. 401).
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 (b)  Break the sharp edges of the cut skin.
 (c)  Apply a layer of clear alodine (Ref 51-21-04/701).
 S 434-028
 (7)  Install the fin tip.
 S 224-012
 (8)  Do a resistance check between the fin leading edge and the forward
 end of the fin tip.
 NOTE:____ The maximum permitted resistance is 0.0005 ohm
 (Ref 20-22-01/601).

 S 224-025
 (9)  Do a resistance check between the fixed trailing edge and the aft end of the fin tip.
 NOTE: The maximum permitted resistance is 0.0005 ohm
____ (Ref 20-22-01/601).
 S 224-026
 (10) Do a resistance check between the forward end of the diverter strip and the forward end of the fin tip.
 NOTE: The maximum permitted resistance is 0.0005 ohm
____ (Ref 20-22-01/601).
 S 224-027
 (11) Do a resistance check between the aft end of the diverter strip and the aft end of the fin tip.
 NOTE: The maximum permitted resistance is 0.0005 ohm
____ (Ref 20-22-01/601).
 S 124-023
 (12) If the resistance is more than 0.0005 ohm between the given surfaces, do the steps that follow:
 (a)  Use a wire brush made of stainless steel to clean the mating surfaces.
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 (b) Do a resistance check again. S 224-014
 (13) Make sure the fastener heads are smooth with the fin tip skin.
 NOTE:____ The maximum distance below the surface is 0.010 inch.
 The maximum distance above the surface is 0.002 inch.  Do not
 cut the fastener heads to get the correct flushness.

 S 224-015
 (14) Do a resistance check between the diverter strips on the side of the fin and either the forward or the aft edge of the fin tip.
 NOTE: The maximum permitted resistance is 0.010 ohm.
____
 S 124-024
 (15) If the resistance is more than 0.010 ohm, do the steps that follow:
 (a)
Remove the fasteners.

 (b)
Clean the mating surfaces of the fasteners and diverter strips.
　
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