S 428-019
 (5)  Install midflap seal bellows
 (a)  
Put the bellows seal into its position.

 (b)  
Attach the bellows seal to the inner baffles.

 (c)  
Attach the Velcro tape to keep the bellows seal in its position.

 (d)  
Install the retaining strips with fasteners around the edge of the seal.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 S 028-020
 (6)  Remove foreflap seal bellows.
 (a)  
Remove the fasteners from around the edge of the foreflap closure rib and the seal end rib.

 (b)  
Remove the retainer strips.

 (c)  
Divide the Velcro tape that holds the bellows seal in its position.

 (d)  
Loosen the fasteners from around the edge of the inner baffle to release the bellows.

 S 428-021
 (7)  Install aftflap seal bellows
 (a)  
Put the bellows seal into its position.

 (b)  
Attach the bellows seal to the inner baffle.

 (c)  
Attach the Velcro tapes to keep the bellows seal in its position.

 (d)  
Install the retaining strips with fasteners around the outer edge of the seal.

 S 868-056
 (8) Do the Put the Airplane Back to its Usual Condition procedure.
 TASK 57-52-01-688-025
 5. Replace Seal Rubstrips
______________________
 NOTE: The replacement of the aft flap and the midflap rubstrips can be done
____ on the airplane. The foreflap must be removed to replace the foreflap rubstrip.
 A. References
 (1)  
AMM 51-51-00/801, Bonded Rub Pads

 (2)  
IPC 57-52-51 Fig. 2 Aft Flap

 B. Access
 (1)  Location Zones
 576 Inboard Flap Foreflap, Left
 577 Inboard Flap Midflap, Left
 578 Inboard Flap Aftflap, Left
 676 Inboard Flap Foreflap, Right
 677 Inboard Flap Midflap, Right
 678 Inboard Flap Aftflap, Right

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747-400 MAINTENANCE MANUAL
 C. Procedure
 S 848-045
 (1)  
Do the Prepare for the Repair of the Seals procedure.

 S 038-030

 (2)  
Remove the rubstrip from the seal end rib.

 S 118-031

 (3)
Clean the mating surfaces of the seal end rib (AMM 51-51-00/801).

 S 348-032
 WARNING:_______DO NOT USE TOO MUCH HEAT TO CURE THE PATCH. TOO MUCH HEAT CAN CAUSE A FIRE.
 CAUTION: MAKE SURE THE HEAT IS APPLIED SMOOTHLY AND THE TEMPERATURE DOES
_______ NOT EXCEED 120°F. IF THE HEAT IS NOT APPLIED SMOOTHLY AND IS ABOVE 120°F, THEN THE BOND CAN BECOME WEAK.
 (4)  Bond a new rubbing sheet to the rib surface of the seal end (AMM 51-51-00/801).
 TASK 57-52-01-808-034
 6.  Replace Velcro Tape (Sealing Strip)___________________________________
 A. References
 (1)  
AMM 51-51-00/801, Bonded Rub Pads

 (2)  
IPC 57-52-51 Fig. 2

 B. Access
 (1)  Location Zone
 576 Inboard Flap Foreflap, Left
 577 Inboard Flap Midflap, Left
 578 Inboard Flap Aftflap, Left
 676 Inboard Flap Foreflap, Right
 677 Inboard Flap Midflap, Right
 678 Inboard Flap Aftflap, Right

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