S 034-014

 (3)  
Disengage the two quick-release stud fasteners on the inboard side of the panel while you hold the panel.

 S 024-015

 (4)  
Move the panel until the fittings on the outboard side of the panel disengage from the slots in the structure.

 S 024-042

 (5)  
Remove the panel from the structure.

 TASK 25-53-17-404-016
 3.  Cargo Handling Control Panels Installation (Fig. 401)__________________________________________
 A. Special Tools and Equipment
 (1)  3PRE65B00040 Lower Cargo Door Opening Safety Barrier
 B. References
 (1)  
24-22-00/201, Manual Control

 (2)  
52-34-00/001, Forward/Aft Cargo Doors

 (3)  
IPC 25-53-68, 25-53-69

 (4)  
SSM 25-53-01

 (5)  
SSM 25-53-02

 C. Access
 (1)  Location Zone
 100 Lower Half of Fuselage

 D. Install the Power-Disconnect Panel
 S 034-020
 (1)  
Remove the screws from the cover on the panel.

 S 034-043

 (2)  
Move the cover to get access to the screws in the panel which attach it to the structure.

 (3)  
Put the panel in its position against the structure.

 S 424-044
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400 MAINTENANCE MANUAL
 S 424-021
 (4)  
Install the screws which attach the panel to the structure.

 S 434-022

 (5)  
Attach the cover to the panel with the screws.

 S 434-023

 (6)  
For the power-disconnect panel in the forward compartment, connect the electrical connector plugs (DM917A and DM917B) to the panel (M917).

 S 434-024

 (7)  
For the power-disconnect panel in the aft compartment, connect the electrical connector plugs (DM924A and DM924B) to the panel (M924).

 E. Install the Cargo Control Panel
 S 424-045
 (1)  
Hold the panel in its position against the structure.

 S 424-025

 (2)  
Engage the two fittings on the outboard side of the panel with the slots in the structure.

 S 434-026

 (3)  
Engage the two quick-release stud fasteners on the inboard side of the panel.

 S 434-027

 (4)  
For the cargo control panel in the forward compartment, connect the electrical connector plug (DM545) to the panel (M545).

 S 434-028

 (5)  
For the cargo control panel in the aft compartment, connect the electrical connector plug (DM546) to the panel (M546).

 F. Do an Operational Test of the Cargo Handling Control Panels
 S 864-029
 (1)  For the control panels in the forward compartment, remove the DO-NOT-CLOSE tag and close this circuit breaker:
 (a)  P414 Main Power Distribution Center Panel Left 1) 414F15 CARGO DOOR CONTROL FWD
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01 Page 405 ú Oct 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
 (2)  S 864-046For the control panels in the aft compartment, remove the DO-NOT-CLOSE tag and close this circuit breaker: (a) P414 Main Power Distribution Center Left Panel 1) 414F16 CARGO DOOR CONTROL AFT
 (3)  S 864-030Make sure the cargo compartment door is fully open.
 NOTE:____ The cargo compartment door must be fully open to supply electrical power to the control panels.
 (4)  S 864-031Push the CAUTION switch-light on the cargo control panel until it starts to flash.
 (5)  S 864-052Prepare to operate the drive-wheels with the control panels as follows: (a) For the control panels in the forward compartment, do these steps: 1) For the cargo control panel, put the POWER DRIVE SYSTEM switch to the AFT DRIVES position. 2) For the power-disconnect panel, put the BAY NO. 4 and BAY NO. 5 switches to the ON position. (b) For the control panels in the aft compartment, do these steps: 1) For the cargo control panel, put the POWER DRIVE SYSTEM switch to the FWD DRIVES position. 2) For the power-disconnect panel, put the BAY NO. 6 and BAY NO. 7 switches to the ON position.
　
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