(c)
Install the fasteners.

 (d)
Do a resistance check again.

 S 344-016
 (16) Apply sealant to the clearance between the fin tip and fin (Ref 51-31-01/201).
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A
747-400 MAINTENANCE MANUAL
 DORSAL FIN - REMOVAL/INSTALLATION
_________________________________
 1.  General
_______
 A.  This procedure contains two tasks. The first task is the removal of the dorsal fin for the vertical stabilizer. The second task is the installation of the dorsal fin for the vertical stabilizer.
 TASK 55-30-03-004-001
 2.  Remove the Dorsal Fin (Fig. 401)
_____________________
 A.  References
 (1)  IPC 53-51-34 Fig. 1
 B.  Access
 (1)  Location Zone
 321 Vertical Stabilizer

 C.  Procedure
 S 024-016
 WARNING: MAKE SURE THAT ALL PERSONS AND EQUIPMENT ARE AWAY FROM THE AREA
_______ BELOW THE DORSAL FIN. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR IF THE EQUIPMENT FALLS.
 (1)
Remove the fasteners that attach the dorsal fin to the fuselage.

 S 014-024

 (2)  
Move the dorsal fin forward sufficiently for an access to the bonding jumper, approximately 5 to 6 inches.

 NOTE: The bonding jumper is on the aft side of the dorsal fin
____
 (Fig. 401).

 S 034-018
 (3)  
Disconnect the bonding jumper from the dorsal fin rib.

 (4)  
Remove the dorsal fin.

 S 034-019
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

0.09 |0.03
INCH A-A
Dorsal Fin Installation Figure 401
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 TASK 55-30-03-404-003
 3. Install the Dorsal Fin (Fig. 401)
______________________
 A. Standard Tools and Equipment
 (1)  
Meter - Bonding

 (2)  
C00064 Alodine - 1000 (Clear)

 (3)  
C00259 Enamel - Primer, Green, BMS 10-11

 (4)  
G00381 Paper - Abrasive, Aluminum Oxide, 180-grit

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

 (2)  
51-21-04/701, Alodized Surfaces

 (3)  
IPC 53-51-34 Fig. 1

 C. Access
 (1)  Location Zone
 321 Vertical Stabilizer

 D. Procedure
 S 424-006
 (1)  
Put the dorsal fin in the correct position on the fuselage without the weather seal around the bottom.

 S 354-007

 (2)
If you install a new dorsal fin, do the steps that follow:

 (a)  Cut the lower edge of the dorsal fin skin.
 NOTE: Make sure you have the correct clearance between the
____ lower edge of the dorsal fin and the fuselage (Fig. 401).
 (b)  
Break the sharp edges of the trimmed skin.

 (c)  
Apply a layer of clear Alodine (Ref 51-21-04/701).

 S 824-020
 (3)  Adjust the shim laminations to get the correct clearance between the bottom of the dorsal fin and the fuselage (View A-A, Fig. 401).
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