52-31-12
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
B26936
A
747-400 MAINTENANCE MANUAL
 NOSE CARGO DOOR SEALS - REMOVAL/INSTALLATION
____________________________________________
 1.  General________
 A.  This procedure has two tasks:
 (1)  
The removal of the nose cargo door seals

 (2)  
The installation of the nose cargo door seals

 B.  
Two types of seals are installed on the nose cargo door. One is a blade-type pressure seal; the other, a bulb-type aerodynamic seal. Each seal is installed in sections which are spliced together on installation to form a continuous seal around the door, except at the hinge area of the aerodynamic seal where the corner seal is installed on fuselage structure.

 TASK 52-31-13-004-001
 2.  Nose Cargo Door Seals Removal (Fig. 401)_____________________________
 A.  References
 (1)  
AMM 52-09-00/801, Door Seals

 B.  
Access

 (1)  
Location Zone
 801 Nose Cargo Door

 C.  
Prepare For Removal

 S 944-003
 (1)  
Install the safety barrier across the door opening.

 S 864-004

 (2)  
Open the nose cargo door to get access to the seals.

 S 864-005

 (3)
Open these circuit breakers and attach the DO-NOT-CLOSE tags:

 (a)  
On the Auxilary External 2 Power Center-Right panel P715: 1) NOSE CARGO DOOR

 (b)  
On the Power Distribution Center-Right panel P415: 1) 415F16, NOSE CARGO DOOR CONTROL

 (c)  
On the Nose Cargo Door Power panel H122: 1) DOOR LIFT 2) PULL UP CAM 3) LATCHES 1-4R 4) LATCHES 1-4L 5) LATCHES 5-8R 6) LATCHES 1-4L

 D.  
Procedure

 S 034-006
 (1)  Pull the seal lip on the pressure seal or the bulb on the aerodynamic seal to remove the seal from the seal retainer.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
UPPER PRESSURE SEAL
SEE A
AERODYNAMIC SEAL SPLICE (7 LOCATIONS) HINGE AREA SEAL COMPRESSIVE JOINT
PRESSURE SEAL SPLICE (EXAMPLE
(3 LOCATIONS) BOTH
HINGES)
AERODYNAMIC SEAL  SEE
B
PRESSURE SEAL NOSE CARGO DOOR
A
LOWER PRESSURE SEAL
FWD
A
SPONGE PLUG
FUSELAGE SEAL A DOOR SEAL
PRESSURE CUT SEALS ON SEAL ANGLE AS REQUIRED TO FORM MATING COMPRESSIVE SURFACE WITH DOOR CLOSED FUSELAGE
____FORWARD
NOTE: JOINT AERODYNAMIC SEAL
SHOWN.
NOSE CARGO
HINGE AREA SEAL COMPRESSIVE JOINT  FWD
DOOR
B
A-A
Nose Cargo Door Seals
Figure 401

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 02 Page 402 ú Feb 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
B26939
A
747-400 MAINTENANCE MANUAL
 TASK 52-31-13-404-002
 3. Nose Cargo Door Seals Installation (Fig. 401)
__________________________________
 A. Consumable Materials
 (1)  
Closed cell silicone sponge rubber. Refer to Chapter 20-30-04, Miscellaneous Materials.

 (2)  
B00598 Methyl Ethyl Ketone - TT-M-261. Refer to 20-30-01, Cleaners and Polishes.

 (3)  
A00360 Adhesive - Dow Corning 30-079 or Silastic 140.

 (4)  
Seal Splice Fabric - Dacron Fabric D-117 or D-118. Refer to 20-30-04, Miscellaneous Materials.

 (5)  
Liquid soap lubricant. Refer to 20-30-04, Miscellaneous Materials.

 B.
References

 (1)  
AMM 52-09-00/801, Door Seals

 C.
Access

 (1)  
Location Zone
 801 Nose Cargo Door

 D.
Pressure Seal Installation

 S 164-007
 (1)  
　
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