(a)  
Push the ALTN FLAPS ARM switch to put the flap system in alternate control.

 (b)  
Move the ALTN FLAPS EXT/RET switch to the EXT position.

 S 864-004
 (3)  
For the applicable system, open these circuit breakers and attach 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 A DRIVE 2
 3) 6L23 LE FLAP ELEC CONT GRP A DRIVE 3
 4) 6L24 LE FLAP ELEC CONT GRP A DRIVE 4

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747-400 MAINTENANCE MANUAL
 5) 6E3 PRIM LE FLAP CONT GRP A AC
 6) 6E4 PRIM LE FLAP CONT GRP A DC
 7) 6E5 PRIM LE FLAP CONT GRP B AC
 8) 6E6 PRIM LE FLAP CONT GRP B DC

 (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
 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 494-005
 CAUTION:_______MAKE SURE THAT YOU INSTALL THE BLOCKS IN THE FLAP LINKAGE. IF YOU DO NOT INSTALL THE BLOCKS, DAMAGE TO THE FLAP PANEL OR THE LINKAGE CAN OCCUR.
 (4)  Install the blocks (47) in the flap linkage (Fig. 401).
 NOTE:____The blocks will absorb the load from the flap panel. This will permit the removal of the bolts at pivot points B, C and
 G.

 (5)  
Put the ALTN FLAPS EXT/RET in the OFF position.

 S 864-006

 (6)  
Do this task if electrical power is not necessary: "Electrical Power Removal" (AMM 24-22-00/201).

 S 864-045
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 S 494-007
 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.
 (7)  
Do this task: "Extended Leading Edge Flap Deactivation and Safety Lock Installation" (AMM 27-81-00/201).

 E.
Remove the Variable Camber Flap

 S 024-008
 (1)  
Remove the folding nose (62) if it is necessary:

 (a)  
Remove the bonding jumper (38) at each point M.

 (b)  
Hold the folding nose and remove eight bolts (59) and washers (60) that attach the hinge assembly (61) to the folding nose (62).

 (c)  
Make a mark of the location of shims at each hinge assembly and keep the shims.

 S 024-009
 (2)  
Remove the variable camber flap:

 (a)  
Remove the bonding jumper (22) between each link FEBC and the structure.

 CAUTION: AT PIVOT POINTS B, E, H AND N, MAKE SURE TO KEEP THE INNER
_______ AND OUTER SLEEVES OF THE BUSHING TOGETHER AS AN ASSEMBLY. THIS WILL PREVENT AN INCORRECT INSTALLATION OF THE BUSHING.
 (b)  
Remove the bolts (11, 16, 24) at each pivot points C, B, G.

 (c)  
Remove the flap (1) from the airplane.

 (d)  
Remove the blocks (47) from the linkage.

 (e)  
Remove the bonding jumpers (22, 38) from the linkage.
　
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