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.  
Prepare to Remove the Diaphragm-Mechanical Seal

 S 824-002
 (1)
Put the door in a position to make the removal of the seal easy.

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

 S 034-004

 (3)  
Remove the lining support plates at the top and lower gates (View A, Fig. 401).

 (a)  
Disconnect the entry door wiring.

 S 014-003
 S 034-005
 (4)  Remove the rod attach bolts to disconnect the gate control rods on the top and lower gates (View A-A, Fig. 401).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 52-09-04
 ALL  ú ú 03 Page 401 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
A
GATE CONTROL ROD
TOP GATE
UPPER GATE
DIAPHRAGM MECHANICAL SEAL
SEAL
A
MAKE A SEAL ON THE
END OF THE SEAL SEE A TOP CORNER RETAINER, PIN AND
DIAPHRAGM SEAL LINING SUPPORT PLATE
B
LOWER GATE
B TOP CORNER
MAIN ENTRY DOOR
(EXAMPLE)

A
FUSELAGE STRUCTURE PRESSURE
MECHANICAL SEAL
INJECTION
TOP GATE SEAL RTV
MECHANICAL
SEALANT
SEAL RETAINER
SEAL RETAINER ROD
GATE CONTROL PRESSURE ROD ATTACH FILLET TOP GATE HINGE BOLT
SEAL RTV SEALANT LOWER GATE
DIAPHRAGM SEAL DIAPHRAGM SEAL DIAPHRAGM
PRESSURE FILLET
SEAL
SEAL RTV
RETAINER
SEALANT
GATE CONTROL ROD
WEATHER PRESSURE
FILLET SEAL FILLET SEAL
BMS 5-95 BMS 5-95
SEALANT
MECHANICAL SEAL
B-BA-A
NOTE: SEAL SHOWN ON LOWER GATE, ____SEALS SHOWN WITH THE DOORNOTE: UPPER GATE SIMILAR.
IN THE CLOSED POSITION.
Diaphragm Mechanical Door Seal
Figure 401

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 52-09-04
 ALL  ú ú 01 Page 402 ú Oct 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 014-029
 (5)  
Disconnect the girt bar lifter radius rods by removing attachment bolts.

 S 014-030

 (6)  
Remove the lower gate splined shaft.

 E.
Remove the Diaphragm-Mechanical Seal

 S 114-025
 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 REUIREMENTS FOR PROPER HANDLING PROCEDURES.
 (1)  
Use IPA, or Ethyl Alcohol to remove the adhesive between the seal and the door structure at the corner locations (View A, Fig. 401).

 S 024-026

 (2)  
Pull the rods from the diaphragm seal retainers (Views A-A and B-B, Fig. 401).

 S 024-007

 (3)  
Pull and roll the mechanical seal to remove it from the mechanical seal retainer around the edge of the door.

 S 024-008

 (4)
Remove the diaphragm-mechanical seal from the door structure.

 TASK 52-09-04-404-009
 3.  Install the Diaphragm-Mechanical Seal (Fig. 401)______________________________________
 A. Special Tools and Equipment
 (1)  
B52004-1 - Door Seal Installation Tool

 B.
Consumable Materials

 (1)  
A00247 Sealant - BMS 5-95, Class B

 (2)  
A00303 Adhesive, RTV 102

 (3)  
B00184 Solvent, BMS 11-7, T-825 Presealing

 (4)  
B00148 Solvent - Methyl Ethyl Ketone (MEK), TT-M-261
　
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