S 715-039

 (30)
 At the master cargo control panel, M1, push the switch for the RIGHT SIDE ENTRY DRIVE UNITS NORMAL/RETRACT.

 S 215-322

 (31)
 Make sure that these conditions occur:

 -
The NORMAL light goes off

 -
The IN TRANSIT light comes on

 -PDUs 19R1 and 19R2 move counterclockwise from the 0-degree fore-aft position to the 45-degree retract position
 -
the RETRACT light comes on

 -
the IN TRANSIT light goes off.

 S 715-323
 (32)
 Do the same steps again for the LEFT SIDE ENTRY DRIVE UNITS NORMAL/RETRACT.

 S 715-040

 (33)
 At the master cargo control panel, M1, push each LEFT and RIGHT SIDE ENTRY DRIVE UNITS NORMAL/RETRACT switch.

 S 215-295

 (34)
 Make sure the NORMAL switches and the IN TRANSIT lights are on.

 S 715-041

 (35)
 At the master cargo control panel, M1, hold the DRIVE CONTROL switch to the OUT position.

 S 215-296

 (36)
 Make sure PDUs 19L1, 19L2, 19R1 and 19R2 move counterclockwise from the 45-degree retract position to the 90-degree lateral position.

 S 215-297

 (37)
 Make sure all four PDUs start to turn in the outboard direction after all four PDUs reach the 90-degree lateral position.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400
MAINTENANCE MANUAL

 S 715-298
 (38) Release the DRIVE CONTROL switch to the OFF position and make sure the PDUs do not continue to turn.
 NOTE: PDUs 19L2, 19R1 and 19R2 complete their turn cycle
____
 before PDU 19L1 starts its cycle.

 S 715-042
 (39)
 At the master cargo control panel, M1, push the switch for the RIGHT ENTRY DRIVE UNITS NORMAL/RETRACT.

 S 215-320

 (40)
 Make sure that these conditions occur:

 -
The NORMAL light goes off

 -
The IN TRANSIT light comes on

 -PDUs 19R1 and 19R2 do not turn but move clockwise from the 90-degree lateral position to the 45-degree retract position
 -
The RETRACT light comes on

 -
The IN TRANSIT light goes off.

 S 715-321
 (41)
 Do the same steps again for the LEFT ENTRY DRIVE UNITS NORMAL/RETRACT.

 S 715-456

 (42)
 At the master cargo control panel, M1, push each LEFT and RIGHT SIDE ENTRY DRIVE UNITS NORMAL/RETRACT switch.

 S 715-457

 (43)
 Make sure the NORMAL switches and the IN TRANSIT lights are on.

 S 715-299

 (44)
 At the local cargo control panel 20R, hold the LOCAL DRIVE switch to the AFT position.

 S 215-300

 (45)
 Make sure the PDUs 19R1 and 19R2 move clockwise from the 90-degree lateral position to the 0-degree fore-aft position.

 S 715-302

 (46)
 Release the LOCAL DRIVE switch to the OFF position and make sure the PDUs do not continue to turn.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 25-57-00
 ALL  ú ú 14A Page 520 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 715-044
 (47)
 At the local cargo control panel 20L, hold the LOCAL DRIVE switch to the AFT position.

 S 215-303

 (48)
 Make sure PDUs 19L1 and 19L2 move clockwise from the 45-degree retract position to the 0-degree fore-aft position.

 S 215-304

 (49)
 Make sure PDUs 19L1, 19L2 and 20L start to turn in the aft direction after PDUs 19L1 and 19L2 reach the 0-degree fore-aft position.

 S 715-305

 (50)
 Release the LOCAL DRIVE switch to the OFF position and make sure the PDUs do not continue to turn.

 NOTE: PDU 19L1 completes its turn cycle before PDU 19L2
____
 starts its cycle.
　
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