S 824-126
 (6)  Align the PDU until the arrow on the PDU is between these angular positions shown on the index block:
 (a)  For PDU 23R, the arrow must be between 3-degrees CW and 16-degrees CW
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 25-57-01
 ALL  ú ú 09A Page 419 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (b)  For PDU 24, the arrow must be between 16-degrees CW and 22-degrees CW.
 S 424-127
 CAUTION: BE CAREFUL WHEN YOU LOWER THE PDU INTO THE SUPPORT FITTING.
_______ DAMAGE COULD OCCUR TO THE LIMIT SWITCHES.
 (7)  ALL PDU'S EXCEPT 4 AND 5, LEFT AND RIGHT; Lower the PDU into the support fitting.
 NOTE: The gear on the bottom of the PDU must engage the gear on the
____
 steering actuator in the floor.

 S 434-158
 (8)  ALL PDU'S EXCEPT 4 AND 5, LEFT AND RIGHT; Release the trigger mechanisms to lock the PDU to the support fitting.
 NOTE: The PDU will lock when the red indicator flag on the trigger
____
 mechanisms retract into the handles.

 S 434-129
 (9)  
Move the PDU handles to the horizontal (folded) position.

 S 414-130

 (10)
 Install the caster trays or lock/stop roller and caster tray which you removed to get access to the PDU (AMM 25-57-04/401 or AMM 25-58-01/401).

 S 864-152

 (11)
 Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P415, Power Distribution Center Right Panel
 1) 415F18, CARGO HANDLING CONT MAIN DECK

 (b)  
P34, Main Deck Cargo Handling Power Panel
 1) PDU 1 & 2 STEERING 2
 2) PDU 3 & STEERING
 3) PDU 4L & 4R STEERING
 4) MAIN DECK CARGO HANDLING CONTROL

 (c)  
P128, Main Deck Cargo Handling Power Panel
 1) PDU 5R & 6R & STEERING
 2) PDU 7R & 8R STEERING 7R
 3) MAIN DECK CARGO HANDLING CONTROL

 (d)  
P130, Main Deck Cargo Handling Power Panel
 1) PDU 22R & 23R STEERING 23R
 2) PDU 24 & STEERING

 (e)  
P133, Main Deck Cargo Handling Power Panel
 1) PDU 5L & 6L & STEERING
 2) PDU 7L & 8L STEERING 7L

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 25-57-01
 ALL  ú ú 08A Page 420 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 3) MAIN DECK CARGO HANDLING CONTROL
 S 714-133
 (12) For PDU 23R and PDU 24, make sure you can electrically operate the PDU from a local cargo control panel:
 NOTE: The PDUs can be operated from more than one local cargo
____ control panel. This test gives instructions to operate the PDUs from only one of the local cargo control panels. Refer to AMM 25-57-00/501 for the full operational test of the PDUs from the other local cargo control panels if it is necessary.
 (a)  
Supply electrical power (AMM 24-22-00/201).

 (b)  
Push the SYSTEM POWER ON switch momentarily at the master cargo control panel (M1).

 (c)  
Move the P29 ARMING-OFF/ARM switch to the ARM position at the local cargo control panel 22AR.

 (d)  
For PDU 23R, do these steps at the local cargo control panel 22AR: 1) Hold the LOCAL DRIVE switch to the AFT position. 2) Make sure the drive-wheel moves and stops at the 3-degree

 clockwise position then turns in the aft direction. 3) Hold the LOCAL DRIVE switch to the FWD position. 4) Make sure the drive-wheel moves and stops at the 13-degree
 clockwise position then turns in the forward direction. 5) Adjust the PDU limit switches if the drive-wheel did not stop at the applicable angular position (AMM 25-57-00/501).
 NOTE: The angular position of the drive-wheel must be less
____ than |1.0 degree of the applicable angular position.
 (e)  For PDU 24, do these steps at the local cargo control panel 24L: 1) Hold the LOCAL DRIVE switch to the AFT position. 2) Make sure the drive-wheel moves and stops at the 16-degree
　
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機維護手冊 EQUIPMENT/FURNISHINGS 2(77)