B.
References

 (1)  
AMM 27-81-03/201, Flap Power Drive Unit and Installed Compoments

 (2)  
SSM 27-81-01, SSM 27-81-02, SSM 27-81-03, SSM 27-81-04

 C.
Access

 (1)  
Location Zones
 221 Control Cabin, LH
 222 Control Cabin, RH
 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 Extended Leading Edge Flaps

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A
747-400 MAINTENANCE MANUAL
 S 482-078
 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.
 (1)  
Do this task: Extended Leading Edge Flap Deactivation and Safety Lock Installation (Ref paragraph 5).

 E.
Extend the Unservicable Leading Edge Flaps

 S 482-072
 (1) For the applicable drive unit, install a jumper wire between the
 ground pin X2 and a structure ground for the applicable relay: ~..................................... |DRIVE UNIT | LEFT WING | RIGHT WING | | AND | RELAY | RELAY | | SET NO. | | | ....................................... | 1 | R361 | R379 | ....................................... | 2 | R365 | R375 | ....................................... | 3 | R367 | R373 | ....................................... | 4 | R369 | R371 | 2...........…............…............1
 S 862-073
 CAUTION:_______DO NOT LET THE LEADING EDGE FLAPS EXTEND FULLY. DAMAGE CAN OCCUR IF THE LEADING EDGE FLAPS EXTEND FULLY AND TOUCH THE DOWN STOPS.
 (2)  
Extend the applicable leading edge flap until you can get access to the torque tubes:

 (a)  
Push the ALTN FLAPS ARM switch on the Captain's center panel to the ARM position.

 (b)  
Turn the ALTN FLAPS EXT/RET switch on the Captain's center panel to the EXT position.

 (c)  
Extend the applicable leading edge flaps until you can get access to the torque tubes.

 NOTE: If the leading edge flaps do not extend electrically,
____ try to open the flaps manually at the flap panel interface.
 (d)  
Turn the ALTN FLAPS EXT/RET switch on the Captain's center panel to the OFF position.

 (e)  
Push the ALTN FLAPS ARM switch on the Captain's center panel.

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747-400 MAINTENANCE MANUAL
 S 082-077
 (3)  
Remove the jumper wire from the pin X2 on the applicable relay.

 S 962-074

 (4)  
Do these tasks to replace the power drive unit: Power Drive Unit Removal and Power Drive Unit Installation (AMM 27-81-03/201).

 TASK 27-81-00-002-030
 15. Flap Lever Lock Removal_______________________
 A. Special Tools and Equipment
 (1)  
G27024, Flap Lever Lock

 B.
Access

 (1)  
Location Zone
 221, 222 Control Cabin

 C.
Procedure

 S 022-029
 (1)  
Remove the flap lever lock:

 (a)  
Loosen the screw on the flap lever lock.

 (b)  
Pull the flap lever lock from the detent plate.

 (c)  
Remove the flap lever lock from the flap control lever.

 TASK 27-81-00-402-031
 16. Flap Lever Lock Installation
____________________________
FLAP

Flap Lever Lock Installation
Figure 204

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