S 962-038
(13)
Do these tasks to replace the power drive unit: "Power Drive Unit Removal" and "Power Drive Unit Installation" (AMM 27-81-03/201).
S 412-013
(14)
Close the leading edge access panel.
S 432-037
(15)
Tighten the four captive bolts.
TASK 27-81-00-862-014
13. Flap Extension with PDU Unserviceable (Alternate Drive Motor Brake__________________________________________________________________ Unserviceable)______________
A. General
(1)
This procedure is used if the PDU does not operate by pneumatic or electrical power, and the alternate electric motor brake is not serviceable. In this procedure, all the leading edge flaps are extended but those with the unserviceable drive unit.
(2)
There are three procedures to extend the variable camber flaps if the PDU and the alternate flap motor brake are unserviceable. The first procedure is to remove a section of the skin panel above the PDU. The second procedure is to remove a corner of the flap panel below the PDU and pull the panel down for access. The third procedure is to cut slots in the top surface of the skin above the PDU. You can cut the drive shaft through these slots.
B.
References
(1)
AMM 27-81-03/201, Flap Power Drive Unit and Installed Components
(2)
AMM 27-81-05/401, Drive Shaft
(3)
AIPC 27-81-03, Fig. 1
(4)
SRM 51-40-09, Glass Fabric Reinforced Epoxy Laminates and Nonmetallic Honeycomb Sandwich Repairs
(5)
SRM 57-30-04, Auxiliary Skin Repair
(6)
SRM 57-50-03, Wing Leading Edge Flap Repair
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A
747-400
MAINTENANCE MANUAL
ACCESS TO DRIVE UNIT NO. 4 (KRUEGER FLAPS)
A
Drive Unit Access (Primary and Alternate Controls Inoperative) Figure 203 (Sheet 1)
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A
747-400
MAINTENANCE MANUAL
FIND THE SLOTS TO BE CUT IN THE LEADING EDGE SKIN FROM THE ROW OF FASTENERS
WING RIB
SPAR
IN THE RIB OR SPAR NEAREST TO THE DRIVE UNIT
CUT SLOT IN WING LEADING EDGE UPPER SKIN PANEL (2.0 X 1/8 INCH)(2 LOCATIONS)
FWD
ACCESS TO DRIVE UNIT NO. 1
(VARIABLE CAMBER FLAPS)
Drive Unit Access (Primary and Alternate Controls Inoperative)
Figure 203 (Sheet 2)
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A
747-400
MAINTENANCE MANUAL
(7)
SSM 27-81-01, SSM 27-81-02, SSM 27-81-03, SSM 27-81-04
(8)
WDM 27-81-11, WDM 27-81-12, WDM 27-81-21, WDM 27-81-22,
WDM 27-81-31, WDM 27-81-32, WDM 27-81-41, WDM 27-81-42
C.
Access
(1)
Location Zone
512 Krueger Flap Inboard, LH
523 Variable Camber Flap, LH
525 Variable Camber Flap, LH
535 Variable Camber Flap, LH
612 Krueger Flap Inboard, RH
623 Variable Camber Flap, RH
625 Variable Camber Flap, RH
635 Variable Camber Flap, RH
D.
Deactivate the Leading Edge Flap
S 492-018
WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE LE FLAP SAFETY LOCKS. THE LE FLAPS CAN MOVE QUICKLY IF YOU DO NOT INSTALL THE SAFETY LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
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