(2)  
SSM 27-51-01, SSM 27-51-02, SSM 27-51-03

 (3)  
WDM 27-51-11, WDM 27-51-21, WDM 27-51-22

 B.
Access

 (1)  
Location Zone 222 Control Cabin, RH 117 Electrical and Electronics Compartment - P414 Left

 Power Distribution Center 118 Electrical and Electronics Compartment - P415 Right Power Distribution Center
 C. Prepare to Activate the Trailing Edge Flaps
 S 802-088
 (1)  
Remove lock assembly P/N G27037-2,-3 and install connectors DM625 and DM622 on inboard and outboard alternate flap drive motors.

 S 422-089

 (2)  
Install connectors DV138 and DV139 to bypass valves.

 S 862-049

 (3)  
Make sure the hydraulic power is not supplied to system 1 and 4 (AMM 29-11-00/201).

 S 862-051

 (4)  
Make sure the ALT FLAPS ARM switch on the pilots' center instrument panel is in the ALTN position.

 S 862-053

 (5)  
Move the flap control lever to the position to agree with the position of the flaps.

 D.
Activate the Inboard Trailing Edge Flaps

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-51-00
 ALL  ú ú 01 Page 214 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 862-035
 WARNING: YOU MUST CAREFULLY DO THE STEPS BELOW TO PREVENT ACCIDENTAL
_______ MOVEMENT OF THE TE FLAPS. THE TE FLAPS CAN MOVE WHEN YOU SUPPLY HYDRAULIC POWER IF THE FLAP ACTUATOR POSITION DISAGREES WITH THE FLAP CONTROL LEVER AND THE ACTUAL FLAP POSITION. MOVEMENT CAN ALSO OCCUR IF ANY OF THE FOLLOWING CIRCUIT BREAKERS ARE OPEN. THESE CIRCUIT BREAKERS PROVIDE THE FLAP CONTROL UNITS (FCU), THE FLAP ACTUATOR AND THE FLAP BYPASS VALVES WITH ELECTRIC POWER.
 (1)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
On the Main Power Distribution Panel, P6:
 1) 6E1, PRI TE FLAP CONT AC
 2) 6E2, PRI TE FLAP CONT DC
 3) 6L20, TE FLAP ELEC CONT INBD

 (b)  
On the Right Power Distribution Panel, P415:
 1) 415A32, TE FLAP ELEC INBD

 E.
Activate the Outboard Trailing Edge Flaps

 S 862-036
 WARNING: YOU MUST CAREFULLY DO THE STEPS BELOW TO PREVENT ACCIDENTAL
_______ MOVEMENT OF THE TE FLAPS. THE TE FLAPS CAN MOVE WHEN YOU SUPPLY HYDRAULIC POWER IF THE FLAP ACTUATOR POSITION DISAGREES WITH THE FLAP CONTROL LEVER AND THE ACTUAL FLAP POSITION. MOVEMENT CAN ALSO OCCUR IF ANY OF THE FOLLOWING CIRCUIT BREAKERS ARE OPEN. THESE CIRCUIT BREAKERS PROVIDE THE FLAP CONTROL UNITS (FCU), THE FLAP ACTUATOR AND THE FLAP BYPASS VALVES WITH ELECTRIC POWER.
 (1)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
On the Main Power Distribution Panel,P6:
 1) 6E1, PRI TE FLAP CONT AC
 2) 6E2, PRI TE FLAP CONT DC
 3) 6L19, TE FLAP ELEC CONT OTBD

 (b)  
On the Right Power Distribution Center, P415: 1) 415M38, TE FLAP ELEC OTBD

 F.
Activate the Flap Control Units

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-51-00
 ALL  ú ú 01 Page 215 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 862-037
 WARNING:_______ YOU MUST CAREFULLY DO THE STEPS BELOW TO PREVENT ACCIDENTAL
 MOVEMENT OF THE TE FLAPS.  THE TE FLAPS CAN MOVE WHEN YOU
 SUPPLY HYDRAULIC POWER IF THE FLAP ACTUATOR POSITION DISAGREES
 WITH THE FLAP CONTROL LEVER AND THE ACTUAL FLAP POSITION.
 MOVEMENT CAN ALSO OCCUR IF ANY OF THE FOLLOWING CIRCUIT
 BREAKERS ARE OPEN.  THESE CIRCUIT BREAKERS PROVIDE THE FLAP
 CONTROL UNITS (FCU), THE FLAP ACTUATOR AND THE FLAP BYPASS

 VALVES WITH ELECTRIC POWER.
 (1)  
Make sure these circuit breakers on the Overhead Circuit Breaker Panel, P7, are closed:

 (a)  
7C10 FLT CONT ELEC 2L AC

 (b)  
　
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