S 864-002
 (1) Pressurize hydraulic systems No. 1 and No. 4 (AMM 29-11-00/201).
 S 864-028
 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.
 (2)  
Put the flap flap control lever in the UP detent to retract the flaps.

 S 864-004

 (3)  
Release the pressure in hydraulic systems No. 1 and No. 4 (AMM 29-11-00/201).

 (4)
Make sure that the landing gear ground locks are installed.

 S 864-005
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400
MAINTENANCE MANUAL

 S 494-006

 WARNING:_______ CAREFULLY DO THE SPECIFIED TASK TO INSTALL THE DOOR LOCKS ON
 THE LANDING GEAR DOORS.  THE DOORS CAN CLOSE QUICKLY IF YOU DO
 NOT INSTALL THE DOOR LOCKS CORRECTLY.  THIS CAN CAUSE INJURY TO

 PERSONS AND DAMAGE TO EQUIPMENT.
 (5)  
Install the door locks on the doors for the body landing gear (AMM 32-00-30/201).

 S 034-007

 (6)  
Remove the flap control module (11)(AMM 27-51-10/201).

 S 864-008

 (7)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P6, Main Power Distribution Panel 1) 6L10, FUEL CONT VALVE ENG 1 2) 6L11, FUEL CONT VALVE ENG 2 3) 6L12, FUEL CONT VALVE ENG 3 4) 6L13, FUEL CONT VALVE ENG 4 5) 6E3, PRIM LE FLAP CONT A-AC 6) 6E4, PRIM LE FLAP CONT A-DC 7) 6E5, PRIM LE FLAP CONT B-AC 8) 6E6, PRIM LE FLAP CONT B-DC 9) 6L20, TE FLAP ELEC CONT INBD 10) 6L19, TE FLAP ELEC CONT OTBD

 (b)  
P7, Overhead Circuit Breaker Panel 1) 7A3, AURAL WARN L 2) 7A4, AURAL WARN R 3) 7C18, LWR YAW DAMPER 4) 7C9, UPR YAW DAMPER 5) 7D13, FLT CONT CMPTR SERVO L 6) 7D8, FLT CONT CMPTR PWR L 7) 7D12, FLT CONT CMPTR SERVO C 8) 7D13, FLT CONT CMPTR PWR C 9) 7D14, FLT CONT CMPTR SERVO R 10) 7D15, FLT CONT CMPTR PWR R 11) 7C10, FLT CONT ELEC 2L-AC 12) 7C11, FLT CONT ELEC 2L-DC 13) 7C12, FLT CONT ELEC 1L-AC 14) 7C13, FLT CONT ELEC 1L-DC 15) 7C14, FLT CONT ELEC 1R-AC 16) 7C15, FLT CONT ELEC 1R-DC 17) 7C16, FLT CONT ELEC 2R-AC 18) 7C17, FLT CONT ELEC 2R-DC

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 19) 7D18, AILERON LOCKOUT
 D. Remove the Flap Control Assembly (Fig. 401)
 S 034-026
 (1)  
Remove the RVDT (14) from the flap control assembly (16) (AMM 27-58-01/401).

 S 034-011

 (2)  
Remove the limit switch pack (15) from the flap control assembly (16)(AMM 27-51-18/401).

 S 024-012

 (3)  
Remove the flap control assembly (16).

 (a)  
Remove the rod (1) from the feedback arm (9).

 (b)  
On the inboard flap control assembly (16), remove the feedback arm (9). 1) Remove the retainer nut (6) and the washer (7) from the

 input crankshaft (2). 2) Loosen the clamp bolt (5). 3) Remove the feedback arm (9) from the crankshaft (2).

 (c)  
On the outboard flap control assembly (16), remove the retainer nut (6) and the washer (7) from the input crankshaft (2).

 (d)  
Remove the four bolts (13) which attach the flap control assembly (16) to the flap power unit (gearbox) (3).

 CAUTION:_______HOLD THE INPUT CRANKSHAFT DURING THE REMOVAL. YOU CAN CAUSE DAMAGE TO THE QUILL SHAFT AND BEARINGS.

 (e)  
Carefully remove the flap control assembly (16) from the airplane.

 (f)  
Remove the quill shaft (17).

 (g)  
Install a plug in the flap power unit (gearbox) (3).

 TASK 27-51-19-404-013
 3.  Flap Control Assembly Installation__________________________________
 A. Consumable Materials
 (1)  C00432, Primer - BMS 10-11, Type 1
　
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