(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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