S 862-007

 (9)  
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

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747-400 MAINTENANCE MANUAL
 4) 5) 6) 7) 8)  6L24 LE FLAP ELEC CONT GRP A DRIVE 46E3 PRIM LE FLAP CONT GRP A AC6E4 PRIM LE FLAP CONT GRP A DC6E5 PRIM LE FLAP CONT GRP B AC6E6 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 212-008
 (10)
 If you replace the PDU, make sure there is a clearance at one of the mechanical extend stops.

 (a)  
If there is no clearance, electrically or pneumatically move the flap set away from the extend stops to release a possible load condition.

 S 862-010
 (11)
 If you replace the alternate electric motor, energize the alternate drive motor brake to release all the load.

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

 1) P6 Main Power Distribution Panel
 a) 6L21 LE FLAP ELEC CONT GRP B DRIVE 1
 b) 6L22 LE FLAP ELEC CONT GRP A DRIVE 2
 c) 6L23 LE FLAP ELEC CONT GRP A DRIVE 3
 d) 6L24 LE FLAP ELEC CONT GRP A DRIVE 4
 2) P7 Overhead Circuit Breaker Panel
 a) 7C10 FLT CONT ELEC 2L-AC
 b) 7C11 FLT CONT ELEC 2L-DC
 c) 7C12 FLT CONT ELEC 1L-AC
 d) 7C13 FLT CONT ELEC 1L-DC
 e) 7C14 FLT CONT ELEC 1R-AC
 f) 7C15 FLT CONT ELEC 1R-DC
 g) 7C16 FLT CONT ELEC 2R-AC
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 (b)

(c)

(d)

(e)

(f)

(g)

(h)

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

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

Push the ALTN FLAPS ARM switch on the pilot's center panel to
 put the flap system in the alternate control.
Put the ALTN FLAPS EXT/RET switch to the RET position then to
 the OFF position.
Push the ALTN FLAPS ARM switch to put the system in the usual
 operation.
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 1)  P6 Main Power Distribution Panel a) 6L21 LE FLAP ELEC CONT GRP B DRIVE 1 b) 6L22 LE FLAP ELEC CONT GRP A DRIVE 2 c) 6L23 LE FLAP ELEC CONT GRP A DRIVE 3 d) 6L24 LE FLAP ELEC CONT GRP A DRIVE 4
 2)  P7 Overhead Circuit Breaker Panel a) 7C10 FLT CONT ELEC 2L-AC b) 7C11 FLT CONT ELEC 2L-DC c) 7C12 FLT CONT ELEC 1L-AC d) 7C13 FLT CONT ELEC 1L-DC e) 7C14 FLT CONT ELEC 1R-AC f) 7C15 FLT CONT ELEC 1R-DC g) 7C16 FLT CONT ELEC 2R-AC h) 7C17 FLT CONT ELEC 2R-DC
P414 Power Distribution Center - Left 1) 414A5 LE FLAP ELEC DRIVE 1 2) 414A2 LE FLAP ELEC DRIVE 4
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747-400 MAINTENANCE MANUAL
　
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