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 (9)  S 424-043Cut and bond the sponge plugs in the ends of fuselage and the door seals in the hinge area. (a) Cut the plugs from silicone sponge rubber to fit 2 inches inside the seal ends. (b) Clean inside of seal ends with methyl ethyl ketone , isopropyl alcohol, or ethyl alcohol and allow to dry. (c) Apply thin coating of adhesive to inside of seal ends and outside of sponge plugs. (d) Put the plugs in ends of seals and allow to dry 48 hours at room temperature before you can cut the seals. (e) Cut the seals on angle as necessary to make mating compressive surfaces when the door is closed. (f) Apply sealant on seal ends and plugs and put splice fabric in adhesive to cover the cut surface. (g) Apply three to four coats of adhesive over the splice fabric to build a protective cover.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 F. Put The Airplane Back To Its Usual Condition
 S 864-023
 (1)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (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

 S 864-024
 (2)  
Fully close, latch and lock the nose cargo door.

 (3)  
Remove the safety barrier across the door opening.

 S 944-025
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 NOSE CARGO DOOR CONTROL SWITCHES - REMOVAL/INSTALLATION
_______________________________________________________
 1.  General________
 A. This procedure has two tasks:
 (1)  
The removal of the nose cargo door control switches

 (2)  
The installation of the nose cargo door control switches

 TASK 52-31-17-004-001
 2.  Nose Cargo Door Control Switch Removal (Fig. 401)______________________________________
 A. Access
 (1)  
Location Zones
 801 Nose Cargo Door

 B.
Prepare for Removal

 S 864-011
 (1)
Open these circuit breakers and attach 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

 C.
Procedure

 S 014-003
 (1)  
Remove the screws and remove the panel.

 (2)
Disconnect the electrical wires and remove the switch.

 S 024-004
 TASK 52-31-17-404-002
 3.  Nose Cargo Door Control Switch Installation (Fig. 401)___________________________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 52-31-00/201, Nose Cargo Door

 B.
Access

 (1)  
Location Zone
 801 Nose Cargo Door

 

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A
747-400
MAINTENANCE MANUAL

SEE A
DOOR
CONTROL
OFF/LOCK
SWITCH
TEST
　
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