(p)  
Put the POWER DRIVE switch in the FWD DRIVES position and hold the joystick in the FWD position. The forward lateral guides should retract and then the longitudinal PDU's should start operating. After approximately 6 seconds, the guides should raise again.

 (q)  
Put the POWER DRIVE switch in the AFT DRIVES position and hold the joystick in the AFT position. The aft lateral guides should retract and then the longitudinal PDU's should start operating. After approximately 6 seconds, the guides should raise again.

 (r)  
Remove all PDU covers.

 S 715-017
 (11) Check operation of the aft cargo compartment power drive system.
 (a)  
Put a piece of paper, or equivalent cover, over the sensor of the roller tray mounted, Power Drive Unit (PDU), at LBL 32.5, Station 1525, and hold the joystick in the FWD (load) position.

 (b)  
Make sure the covered PDU raises up and the drive-wheels turn in the fwd direction. Verify that PDU stops after approximately 6 seconds and the yellow LED on the PDU at LBL 32.5, Station 1565, is constantly on.

 (c)  
Put an additional cover over the sensor of the PDU at LBL 32.5, Station 1565 and hold the joystick in the FWD position. This PDU should stop after approximately 6 seconds and the yellow LED on the PDU at LBL 32.5, Station 1605 should constantly be on.

 (d)  
Cover the sensor of the PDU at LBL 32.5, Station 1605 and repeat the same procedure for PDU's at Station 1645, 1685, 1725, 1765, and 1805.

 (e)  
Put an additional cover over the sensor of the longitudinal (fwd/aft) ballmat PDU's at LBL 38.16, Station 1829, 1863, and 1886 and hold the joystick in the FWD position. These PDU's should not stop after 6 seconds.

 (f)  
Put the joystick in the AFT (unload) position, release joystick for a period less than 2 seconds and put the joystick in the AFT position again. The ballmat PDU's at LBL 38.16 , Station 1829, 1863, and 1886, and the roller tray PDU at LBL 32.5, Station 1805 should operate in the aft direction.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 (g)  Release and activate joystick in the AFT position again. The
 PDU at LBL 32.5, Station 1765 should also start operating.
 (h)  Continue to release and activate joystick in the AFT position
 until all PDU's at LBL 32.5, operate.
 (i)  Hold joystick in LEFT FWD position. All covered PDU's should
 operate. Put the Bay 6 and 7 cutoff switches to OFF. PDU's in
 Bays 6 and 7 should stop. Put the switches back to ON.
 (j)  Put the joystick in the RIGHT FWD position. All covered PDU's
 should not operate.
 (k)  Remove all covers on PDU's.
 (l)  Accomplish the same steps for PDU's at RBL 32.5 and 38.16.
 (m)  Cover the sensors of all ballmat PDU's. Put joystick in FWD or
 AFT position. All longitudinal PDU's should operate and
 continue to operate after 6 seconds. Put joystick in IN or OUT
 position. All lateral PDU's should operate and continue to
 operate after 6 seconds.
 (n)  With ballmat PDU sensors still covered, put LATERAL GUIDES
 switch in the NORMAL position. Lateral guides should raise.
 (o)  Put the POWER DRIVE switch in the ON position and hold the
 joystick in the FWD position. The lateral guides should
 retract and then the longitudinal PDU's should start operating.
 After approximately 6 seconds, the guides should raise again.
 (p)  Remove all PDU covers.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400
MAINTENANCE MANUAL

 TASK 25-53-00-705-018
 3. Adjustment - Cargo Handling System
__________________________________
 A. Adjust the Retractable Lateral Guide Rails (Fig. 502)
　
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