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 (2)  S 715-023On the master cargo control panel, M1, push the SYSTEM POWER ON switch to activate the system.
 (3)  S 715-386On the side door cargo control panel, M1, push the SYSTEM POWER ON switch to start the system.
 (4)  S 715-387On the side door cargo control panel, M1, push the LEFT and RIGHT ENTRY DRIVE UNITS ON/OFF and NORMAL/RETRACT switches to the ON and NORMAL positions, respectively.
 (5)  S 215-247Make sure the ON and NORMAL switches lights come on.
 (6)  S 715-388On the side door cargo control panel, M1, hold the LOCAL DRIVE switch to the FWD position.
 (7)  S 215-462Make sure the PDUs 19L1 and 19L2 start to turn in the forward direction, then release the LOCAL DRIVE switch to the OFF position.
 (8)  S 215-249Make sure the PDUs do not continue to turn.
 (9)  S 715-025At each left and right side local cargo control panel (CCM 19R thru 22R, and CCM 20L thru 22L), hold the LOCAL DRIVE switch to the FWD and AFT positions.
 S 215-250

 (10) Make sure the appropriate PDUs turn in the selected direction as shown in Fig. 501, then move the LOCAL DRIVE switch to the OFF position.
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747-400 MAINTENANCE MANUAL
 S 215-251
 (11) Make sure the PDUs do not continue to turn.
 I. P29th Pallet Position System Test
 S 715-026
 (1)  
At the local cargo control panel 22R, put the P29 ARMING OFF/ARM switch in the ARM position.

 S 715-476

 (2)  
At the local cargo control panel 21R, hold the LOCAL DRIVE switch to the FWD position and make sure PDU 23R turns in the forward direction.

 S 215-252

 (3)  
Make sure the PDU 23R moves to the 13-degree clockwise position before it turns in the forward direction.

 S 715-477

 (4)  
Release the LOCAL DRIVE switch to the OFF position and make sure the PDU does not continue to turn.

 S 715-478

 (5)  
At the local cargo control panel 22R, hold the LOCAL DRIVE switch to the AFT position and make sure PDU 23R turns in the aft direction.

 S 215-254

 (6)  
Make sure the PDU 23R moves counterclockwise from the 13-degree CW position to the 3-degree CW position before it turns in the aft direction.

 S 715-479

 (7)  
Release the LOCAL DRIVE switch to the OFF position and make sure the PDU does not continue to turn.

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747-400
MAINTENANCE MANUAL

 (8)  S 715-480At the local cargo control panel 22R, hold the LOCAL DRIVE switch to the FWD position and make sure the PDUs 23R and 24 turn in the forward direction.
 (9)  S 215-256Make sure the PDU 23R moves clockwise from the 3-degree CW position to the 13-degree CW position before it turns in the forward direction.
 S 215-257

 (10)
 Make sure the PDU 24 moves to the 22-degree clockwise position before it turns in the forward direction.

 S 715-258

 (11)
 Release the LOCAL DRIVE switch to the OFF position and make sure the PDUs do not continue to turn.

 S 715-481

 (12)
 At the local cargo control panel 24L, hold the LOCAL DRIVE switch to the AFT position and make sure the PDUs 23R and 24 turn in the aft direction.

 S 215-259

 (13)
 Make sure the PDU 23R moves counterclockwise from the 13-degree CW position to the 3-degree CW position before it turns in the aft direction.

 S 215-260

 (14)
 Make sure the PDU 24 moves counterclockwise from the 22-degree CW position to the 16-degree CW position before it turns in the aft direction.

 S 715-261

 (15)
 Release the LOCAL DRIVE switch to the OFF position and make sure the PDUs do not continue to turn.

 S 715-116

 (16)
 At the local cargo control panel 24L, hold the LOCAL DRIVE switch to the FWD position.
　
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