E.
Extend the Unserviceable Krueger Flap

 S 862-051
 (1)  
Extend the unserviceable krueger flaps:

 (a)  
Loosen four captive bolts on the leading edge access panel adjacent to the inboard end of the krueger flaps (Fig. 202 Detail A).

 (b)  
Open the panel to get access through the opening to PDU No. 4.

 (2)  
Disconnect the drive shaft from the PDU.

 (3)  
Pull the flap panel open.

 (4)  
Close the leading edge cavity access panel.

 (5)  
Tighten four captive bolts.

 S 032-045
 S 012-046
 S 412-047
 S 432-048
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747-400 MAINTENANCE MANUAL
 F. Extend the Unserviceable Variable Camber Flap
 S 352-023
 (1)  
Extend the unserviceable variable camber flaps by the skin panel removal procedure:

 (a)  
Remove a section of the leading edge skin panel above the PDU with rib on each side of the PDU (SRM 57-30-04).

 S 352-035
 (2)  
Extend the unserviceable variable camber flaps by the flap panel removal procedure:

 (a)  
Drill the forward corner of the fasteners that attach the flap panel to its stringers.

 NOTE: The forward inboard corner fasteners in the flap panels
____ No. 2, 7 or 9 give access to the left wing PDU's No. 1, 2 or 3. The forward outboard corner fasteners in the flap panels No. 17, 19 or 24 give access to the right wing PDU's No. 3, 2 or 1.
 (b)  Pull the corner of the flap down a maximum of 4 inches for access to the drive shaft (SRM 57-30-03).
 S 352-027
 (3)  
Extend the variable camber flaps by the skin panel slotting
 procedure (Fig. 202):

 (a)  
Cut the slots in the leading edge skin panel above the PDU.

 S 352-028
 CAUTION: IF THE SLOTS ARE CUT IN THE SKIN, DO NOT MAKE THE SLOTS
_______ LARGER THAN NECESSARY WHEN YOU CUT THE DRIVE SHAFT. THERE IS A LIMIT FOR THE PERMITTED HOLE DIMENSION IN THE SKIN PANEL WHICH YOU CAN REPAIR.
 (4)  Disconnect or cut the drive shafts on each side of the PDU.
 NOTE: Drive shafts must be cut if you use the skin panel slotting
____
 procedure.

 S 862-044
 (5)  
Pull the flap panel open.

 S 962-041

 (6)  
Do these tasks to replace the PDU: "Power Drive Unit Removal" and "Power Drive Unit Installation" (AMM 27-81-03/201).

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747-400 MAINTENANCE MANUAL
 S 962-030
 (7)  
Connect the disconnected drive shafts or do these tasks to replace the cut drive shafts : "Drive Shaft Removal" and "Drive Shaft Installation" (AMM 27-81-05/401).

 S 962-031

 (8)  
If you removed the variable camber flap panel from the stringers for access to the drive unit, replace the flap to the stringer fasteners (SRM 57-50-03).

 S 962-040

 (9)  
If you removed the skin panel section for access to the variable camber flap PDU, replace the skin panel (SRM 57-30-04).

 S 342-032

 (10)
 If you cut the slots in the leading edge skin panel above the variable camber flap PDU, repair the skin panel (SRM 51-40-09).

 TASK 27-81-00-862-073
 14. Leading Edge Flaps Extension with PDU Unserviceable (Broken Annunciator_______________________________________________________________________ Switch Actuator)________________
 A. General
 (1)  
This task is used if a PDU does not operate in pneumatic, primary electric or alternate electric mode. This failure can be caused by a failed annunciator switch and/or an annunciator switch actuator. This procedure allows you to release the alternate motor brake and extend the drive unit in the alternate electric mode. If the flaps do not extend electrically, this procedure releases the alternate motor brake which should permit you to manually open the flap to get access. In this task, all the leading edge flaps are extended, except those with the unserviceable drive unit.
　
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