(3)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (4)  
AMM 36-00-00/201, Pneumatic System

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747-400 MAINTENANCE MANUAL
 (5)  
SSM 27-81-01, SSM 27-81-02, SSM 27-81-03, SSM 27-81-04,
 SSM 27-81-05, SSM 27-81-06

 (6)  
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,
 WDM 27-81-41, WDM 27-81-42, WDM 27-81-81, WDM 27-81-82

 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.
Procedure

 S 422-135
 (1)  
Install the overpressure switch (19) (Fig. 201):

 (a)  
Remove the cover from the switch opening in the PDU.

 (b)  
Install the o-ring (20) on the switch (19).

 (c)  
Install the switch in the PDU.

 (d)  
Install the lockwire.

 S 432-136
 (2)  Connect the electric connector P103 (21) (and connector clamp, if it is available).
 S 092-137
 WARNING:  YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
_______ LE FLAP SAFETY LOCKS. THE LE FLAPS CAN MOVE QUICKLY IF YOU DO NOT DO THE STEPS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (3)  
Do this task: "Safety Lock Removal and Leading Edge Flap
 Activation" (AMM 27-81-00/201).

 (4)  
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).

 S 862-139

 (5)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (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
 5) 6E3 PRIM LE FLAP CONT GRP A AC

 S 862-138
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747-400 MAINTENANCE MANUAL
 6) 7) 8)  6E4 6E5 6E6  PRIM LE FLAP CONT GRP A DCPRIM LE FLAP CONT GRP B ACPRIM 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 862-157
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
_______ FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (6)  
Make sure the flap control lever is in the 5 unit detent minimum and in the same position as the trailing edge flaps.

 S 862-141

 (7)  
Do this task: "Supply Pneumatic Power" (AMM 36-00-00/201).

 S 862-142

 (8)  
Do this task to pressurize hydraulic systems No. 1 and 4: "Hydraulic System Pressurization" (AMM 29-11-00/201).

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