(b)  
Retract the flaps electrically:

 1)  Move the ALTN FLAPS EXT/RET switch to the OFF position momentarily then move the ALTN FLAPS EXT/RET switch to the RET position.

 (c)  
Put the ALTN FLAPS EXT/RET switch to the OFF position.

 (d)  
Push the ALTN FLAPS ARM switch to put the system in the usual operation.

 (e)  
Make sure that the aft edge of the flaps is less than one inch of the aligned position.

 (f)  
Put the flap control lever in the 5 unit detent to extend the LE flaps pneumatically.

 (g)  
Make sure the flap set is fully extended and aligned with the adjacent flaps.

 H.  
Put the Airplane Back to Its Usual Condition

 S 862-044
 (1)  Do this task if hydraulic power is not necessary for hydraulic systems No. 1 and 4: "Hydraulic System Depressurization" (AMM 29-11-00/201).
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747-400 MAINTENANCE MANUAL
 S 862-045
 (2)  
Do this task to if pneumatic power is not necessary: "Pneumatic Power Removal" (AMM 36-00-00/201).

 S 862-046

 (3)  
Do this task if electric power is not necessary: "Electric Power Removal" (AMM 24-22-00/201).

 TASK 27-81-03-002-047
 4.  Alternate Electric Motor Removal________________________________
 A. Special Tools and Equipment
 (1)  
17MIT65B04017 Leading Edge Flap Drive Unit Lock

 B.
References

 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 27-81-00/201, Leading Edge Flap System

 (3)  
AIPC 27-81-03, Fig. 1

 (4)  
SSM 27-81-01, SSM 27-81-02, SSM 27-81-03, SSM 27-81-04

 (5)  
WDM 27-51-21, WDM 27-51-22, WDM 27-81-11, WDM 27-81-12, WDM 27-81-21, WDM 27-81-22, WDM 27-81-31, WDM 27-81-32

 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.
Prepare for Removal

 S 862-048
 (1)
Open these circuit breakers and remove the DO-NOT-CLOSE tags:

 (a)  
P6 Main Power Distribution Panel 1) 6L21 LE FLAP ELEC CONT GRP B DRIVE 1 2) 6L22 LE FLAP ELEC CONT GRP B DRIVE 2 3) 6L23 LE FLAP ELEC CONT GRP A DRIVE 3 4) 6L24 LE FLAP ELEC CONT GRP A DRIVE 4

 (b)  
P7 Overhead Circuit Breaker Panel
 1) 7C10 FLT CONT ELEC 2L-AC
 2) 7C11 FLT CONT ELEC 2L-DC
 3) 7C12 FLT CONT ELEC 1L-AC
 4) 7C13 FLT CONT ELEC 1L-DC
 5) 7C14 FLT CONT ELEC 1R-AC
 6) 7C15 FLT CONT ELEC 1R-DC
 7) 7C16 FLT CONT ELEC 2R-AC

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A
747-400 MAINTENANCE MANUAL
 8) 7C17 FLT CONT ELEC 2R-DC
 (c)  
P414 Power Distribution Center - Left 1) 414A5 LE FLAP ELEC DRIVE 1 2) 414A2 LE FLAP ELEC DRIVE 4

 (d)  
P415 Power Distribution Center - Right 1) 415M35 LE FLAP ELEC DRIVE 2 2) 415B32 LE FLAP ELEC DRIVE 3

 S 492-049
 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.
 (2)  
Do this task: "Extended Leading Edge Flap Deactivation and Safety Lock Installation" (AMM 27-81-00/201).

 S 862-050

 (3)
Do this task: "Electrical Power Removal" (AMM 24-22-00/201).
　
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