(3)  
AIPC 25-57-01

 B. Access
 (1)  Location Zones
 200 Upper Half of Fuselage (Main Deck)

 C. Remove the Nonsteerable PDU
 S 864-147
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  
P415, Power Distribution Center Right Panel 1) 415F15, CARGO HANDLING CONT MAIN DECK

 (b)  
P34, Main Deck Cargo Handling Power Panel 1) PDU 1 & 2 STEERING 2 2) MAIN DECK CARGO HANDLING CONTROL

 S 014-081
 (2)  
Remove the lock/stop roller and caster tray to get access to the PDU (AMM 25-58-01/401).

 S 034-082

 (3)  
Lift the trigger mechanism below each handle on the PDU to release the PDU from the support fitting.

 NOTE: The PDU will release when the red indicator flag on each
____ trigger mechanism extends above the handles.
 S 024-083
 (4)  Lift the PDU to remove it from the support fitting.
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747-400 MAINTENANCE MANUAL
 S 034-084
 (5)  Disconnect the end fitting of the manual disengage cable from the drive-wheel actuator.
 NOTE: If it is necessary, connect the end fitting to the dummy
____ fitting on the support structure below the floor.
 S 034-085
 (6)  Disconnect the electrical connector plug for the drive-wheel actuator from the electrical receptacle on the support structure (WDM 25-57-23, WDM 25-57-24, and WDM 25-57-25).
 NOTE: If it is necessary, attach the connector plug to the dummy
____ receptacle on the PDU housing. Remove the dust cap from the dummy receptacle on the support structure and install it to the electrical receptacle.
 S 434-086
 (7)  Install a cover for the PDU wheel well in the floor if it is necessary.
 D. Remove the Tray Mounted PDUs
 S 864-176
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  
P128, Main Deck Cargo Handling Power Panel
 1) PDU 7R & 8R STEERING 7R
 2) PDU 9R & 10R
 3) PDU 11R & 12R
 4) MAIN DECK CARGO HANDLING CONTROL

 (b)  
P129, Main Deck Cargo Handling Power Panel
 1) PDU 13R & 14R
 2) PDU 15R & 16R

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747-400 MAINTENANCE MANUAL
 (c)  
P130, Main Deck Cargo Handling Power Panel
 1) PDU 20R & 21R
 2) PDU 22R & 23R STEERING 23R

 (d)  
P133, Main Deck Cargo Handling Power Panel
 1) PDU 7L & 8L STEERING 7L
 2) PDU 9L & 10L
 3) PDU 11L & 12L
 4) MAIN DECK CARGO HANDLING CONTROL

 (e)  
P134, Main Deck Cargo Handling Power Panel
 1) PDU 13L & 14L
 2) PDU 15L & 16L

 (f)  
P135, Main Deck Cargo Handling Power Panel
 1) PDU 20L & 21L
 2) PDU 22L & 23L
 3) MAIN DECK CARGO HANDLING CONTROL

 S 864-171
 (2)  
Make sure the Power Drive System switch on the cargo control panel is in the OFF position.

 S 024-167

 (3)  
Remove the transport roller located after the electrical connector if installed.

 S 024-168

 (4)  
Remove the two shoulder screws which hold the PDU to the Tray Lock Assy.

 (5)  
Remove the PDU from the Tray Lock Assy.

 S 024-170

 (6)  
Disconnect the electrical connector from the PDU.

 S 024-169
 E. Remove the Retractable/Steerable PDUs
 S 864-148
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P415, Power Distribution Center Right Panel
　
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