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747-400 MAINTENANCE MANUAL
 S 862-047
 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.
 (3)  
Make sure these circuit breakers are closed:

 (a)  
On the overhead circuit breaker panel, P7:
 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

 (b)  
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
 4) 6L20, TE FLAP ELEC CONT INBD

 (c)  
On the Right Power Distribution Panel, P415:
 1) 415A32, TE FLAP ELEC INBD
 2) 415M38, TE FLAP ELEC OTBD

 

 S 862-021
 CAUTION: DO NOT OPERATE THE TRAILING EDGE FLAPS WITH ELECTRICAL POWER
_______ THROUGH MORE THAN ONE FULL EXTEND/RETRACT CYCLE IN A 25-MINUTE TIME. THERE WILL BE DAMAGE TO THE FLAP ELECTRIC MOTORS IF YOU OPERATE THEM TOO FREQUENTLY.
 (4)  Retract the flaps in the primary electric mode:
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE TE
_______ AND LE FLAPS BEFORE YOU MOVE THE FLAP CONTROL LEVER. THE TE AND LE FLAPS WILL MOVE AUTOMATICALLY WITH ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER.
 (a)  
Move the flap control lever to the UP detent to fully retract the flaps.

 (b)  
Make sure the flap indicator bars of the FLAPS display on the EICAS change from green to magenta color when the flaps start to move.

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 ALL  ú ú 03 Page 210 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 (c)  Make sure the flap indicator bars change to green when the flaps are fully retracted.
 S 862-056
 (5)  Retract the flaps in the alternate electric mode:
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE TE
_______ AND LE FLAPS BEFORE YOU OPERATE THE ALTERNATE FLAPS CONTROL SWITCHES. THE TE AND LE FLAPS WILL MOVE AUTOMATICALLY WITH ELECTRICAL POWER WHEN YOU OPERATE THE ALTERNATE FLAPS CONTROL SWITCHES.
 (a)  
Push the ALTN FLAPS ARM switch on the pilots' center instrument panel to the ALTN position.

 (b)  
Turn the ALTN FLAPS EXT/RET switch on the pilot's center instrument panel to RET.

 (c)  
Monitor the multiple FLAPS alternate display on the EICAS while the flaps retract.

 (d)  
Set the ALTN FLAPS EXT/RET switch to the OFF position when the flaps are fully retracted.

 WARNING: MAKE SURE ALL PERSONS AND EQUIPMENT ARE CLEAR OF THE LE
_______ AND TE FLAPS AND FLAP DRIVE MECHANISMS. THE TE AND LE FLAPS WILL MOVE TO AGREE WITH THE CONTROL LEVER POSITION WHEN YOU DISARM ALTERNATE CONTROL. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (e)  
Put the flap control lever in the UP detent.

 (f)  
Push the ALTN FLAPS ARM switch to the off position.

 (6)
Do this task: "Remove Electrical Power" (AMM 24-22-00/201).

 S 862-015
 TASK 27-51-00-042-016
 8.  Trailing Edge Flaps Deactivation________________________________
 A. References
 (1)  AMM 29-11-00/201, Main Hydraulic Supply System
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01 Page 211 ú Oct 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL
　
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