25-53-18
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 864-005
 (4)  Push the CAUTION switch-light on the cargo control panel until it starts to flash.
 E. Remove the Ball Unit
 S 024-027
 (1)  Do these steps to remove the ball unit:
 (a)  
Insert a slotted screwdriver in each recess of the ball unit.

 (b)  
Lift the ball unit from the ball transfer panel.

 TASK 25-53-18-404-009
 3. Ball Unit 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 25-53-15

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

 D. Procedure
 S 424-028
 (1)  Do these steps to install the ball unit:
 (a)  
Align the ball unit with the hole in the ball-transfer panel.

 (b)  
Push the ball unit down into the ball-transfer panel until the two tabs engage fully.

 E. Put the Airplane Back to Its Usual Condition
 S 864-017
 (1)  
Push the CAUTION switch-light on the cargo control panel until it does not flash.

 S 094-018

 (2)  
Remove the safety barrier (3PRE65B00040) from the opening of the cargo compartment door if it is not necessary.

 (3)  
Close the cargo compartment door (Ref 52-34-00/001).

 S 864-020

 (4)  
Remove the electrical ground power if it is not necessary (Ref 24-22-00/201).

 S 414-019
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 ADEC BOX - REMOVAL/INSTALLATION
_______________________________
 1.  General_______
 A.  This procedure has two tasks:
 (1)  
The first task is the removal of the ADEC Box from the forward and aft cargo compartments.

 (2)  
The second task in the installation of the ADEC Box in the forward and aft cargo compartments

 B.  There are two ADEC Boxes, one is located in the forward cargo compartment and one in the aft cargo compartment. Each ADEC Box is mounted underneath the right-hand roller tray forward of the doorway area.
 C.  Each ADEC Box serves as an electrical/electronic interface unit between the Telair PDU system and the Boeing cargo control panel.
 TASK 25-53-22-004-001
 2.  ADEC Box Removal (Fig. 401)________________
 A.  Special Tools and Equipment
 (1)  3PRE65B00040, Lower Cargo Door Opening Safety Barrier
 B.  References
 (1)  
AMM 24-22-00/201, Manual Control

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

 (3)  
AMM 25-53-24/401, Transport Roller Installation

 (4)  
AIPC 25-53-16

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

 D.  Prepare for the Removal
 S 864-002
 (1)  
Supply electrical ground power (AMM 24-22-00/201).

 (2)  
Open the cargo compartment door (AMM 52-34-00/001).

 S 014-003
 S 494-004
 WARNING: BE CAREFUL WHEN YOU ARE NEAR THE OPENING OF THE CARGO
_______ COMPARTMENT DOOR. INSTALL A SAFETY BARRIER (3PRE65B00040) ACROSS THE OPENING OF THE DOOR UNLESS AN ACCESS STAND IS AT THE DOOR. INJURY TO PERSONS CAN OCCUR IF THEY FALL THROUGH THE OPENING OF THE DOOR.
 (3)  Install a safety barrier (3PRE65B00040) across the opening of the cargo compartment door if it is necessary.
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