B.
Access

 (1)  
Location Zone
 221, 222 Control Cabin

 (2)  
The procedure to extend the trailing edge flaps with hydraulic power is in paragraph 4.

 (3)  
The procedure to extend the trailing edge flaps with electrical power is in paragraph 6.

 TASK 27-51-00-862-019
 3. Trailing Edge Flaps Retraction
______________________________
 A. General
 (1)  You can retract the trailing edge flaps with hydraulic power or with electrical power. Use hydraulic power to retract the flaps if it is necessary to extend and retract the flaps more than one time in 25 minutes. You can use electrical power to retract the flaps if it is not necessary extend and retract the flaps more than one time in 25 minutes.
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A
747-400
MAINTENANCE MANUAL

 B. Access
 (1)  
Location Zone
 221, 222 Control Cabin

 (2)  
The procedure to retract the trailing edge flaps with hydraulic power is in paragraph 5.

 (3)  
The procedure to retract the trailing edge flaps by electrical power is in paragraph 7.

 TASK 27-51-00-862-020
 4.  Trailing Edge Flaps Extension with Hydraulic Power__________________________________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (3)  
SSM 27-51-01

 (4)  
WDM 27-51-11

 B.
Access

 (1)  
Location Zone
 221, 222 Control Cabin

 C.
Procedure

 S 862-044
 (1) Do this task: "Supply Electrical Power" (AMM 24-22-00/201).
 S 862-076
 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.
 (2)  
Make sure these circuit breakers are closed:

 (a)  
On the overhead circuit breaker panel, P7: 1) 7C10, FLT CONT ELEC 2L AC

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747-400 MAINTENANCE MANUAL
 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 862-022
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
_______ SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. AILERONS, RUDDERS, ELEVATORS, FLAPS, SPOILERS, LANDING GEAR AND THRUST REVERSERS CAN MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (3)  Do this task to pressurize hydraulic systems No. 1 and 4: "Hydraulic System Pressurization" (AMM 29-11-00/201).
 S 862-069
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE TE AND LE
_______ FLAPS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH PNEUMATIC POWER OFF, THE LEADING EDGE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER.
　
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