S 348-040
 (9)  
Repair a damaged section of a seal.

 (a)  
Remove the damaged section of the seal.

 1)  Make sure the ends of the repair are on flat parts of the seal.

 (b)  
Replace the damaged area with a section of a spare seal that is the same length.

 (c)  
Make a splice to hold the new section of the seal. 1) Prepare two inches of the surface on each side of the

 splice. 2) Make mitered cuts on the adjacent seal surfaces. 3) Fill the mitered cuts with Type II or Type III adhesive. 4) Use Procedure B and Procedure C to bond the splices.
 S 348-039
 (10) Repair a torn entry door sweeper seal.
 NOTE: The sweeper seal can make a tear from the end attach screw
____ holes. Some airplanes have a metal seal retainer below the attach screw heads to decrease the possibility of these tears. The metal seal retainers can be installed to prevent tears or hold the seal to the door lining if there is a tear.
 (a)  
Remove the lower lining from the door (Ref 52-11-02/401).

 (b)  
Remove the seal attach screws (Fig. 803).

 (c)  
Align the screw holes in the seal and the lower lining and install the seal retainers to hold the damaged seal.

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 52-09-00
 ALL  ú ú 01 Page 810 ú Oct 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

SWEEPER SEAL
SEE A
MAIN ENTRY DOOR (EXAMPLE)
ENTRY DOOR
LOWER LINING

SWEEPER SEAL
(EXAMPLE)

END SEAL ATTACH SCREWS
1 SEAL RETAINERS CAN BE INSTALLED ON A DOOR TO HOLD THE SEAL IF THE ATTACHMENT SWEEPER SEAL
SEAL
SCREW HOLES ARE TORN OUT.

RETAINER A
1
Torn Sweeper Seal Repair
Figure 803

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 52-09-00
 ALL  ú ú 01 Page 811 ú Jun 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 DIAPHRAGM SEALS - REMOVAL/INSTALLATION
______________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task is the removal of the diaphragm seal. The second task is the installation of the diaphragm seal.
 B.  Diaphragm seals are part of the flap type mechanical seals used on the main entry doors. They can be disconnected from the door without the full removal of the seal by this procedure. If the full removal of the diaphragm-mechanical seal is necessary, refer to 52-09-04/401, Diaphragm-Mechanical Seals.
 TASK 52-09-01-004-001
 2.  Remove the Diaphragm Seal (Fig. 401)_________________________
 A.  Consumable Materials
 (1)  
B00148 Solvent - Methyl Ethyl Ketone (MEK), TT-M-261

 B.  
References

 (1)  
52-11-02/401, Main Entry Door Lining and Insulation

 (2)  
IPC 52-09-01 Fig. 1

 C.  
Access

 (1)  
Location Zones
 831L No. 1 Main Entry Door (Left)
 835L No. 5 Main Entry Door (Left)

 D.  
Procedure

 S 824-003
 (1)
Put the door in a position to make the removal of the seal easy.

 S 014-004

 (2)  
Remove the door lining (Ref 52-11-02/401).

 S 114-019
 WARNING: DO NOT GET SOLVENTS IN YOUR MOUTH, OR YOUR EYES, OR ON YOUR
_______ SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. SOLVENTS MAY BE FLAMMABLE OR HARMFUL TO THE ENVIRONMENT. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
 (3)  Use the MEK, isopropyl alcohol, or ethyl alcohol to remove the adhesive between the seal and the door structure at the corner locations.
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