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27-81-03
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
8) 6E6 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 862-079
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE FLAPS
_______ BEFORE YOU SUPPLY PNEUMATIC POWER. IF THE FLAP CONTROL LEVER IS IN THE FULL UP DETENT AND THE TE FLAPS ARE RETRACTED, THE LE FLAPS WILL RETRACT WHEN YOU SUPPLY PNEUMATIC POWER. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(9)
Do this task: "Supply Pneumatic Power" (AMM 36-00-00/201).
S 862-080
(10)
Do this task to pressurize hydraulic systems No. 1 and 4: "Hydraulic System Pressurization" (AMM 29-11-00/201).
NOTE: Hydraulic power is not necessary if the TE flaps are extended
____ 5 unit and you use the reverse thrust levers to operate the LE flaps.
S 712-081
(11) Do a check on the operation of the servomotor assembly:
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-81-03
ALL ú ú 02 Page 232 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
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. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(a) Operate the flaps electrically in each direction to make sure the alternate drive electrical connector is correctly installed.
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE
_______ FLAPS BEFORE YOU MOVE THE REVERSE THRUST LEVERS. THE ENGINE THRUST REVERSER SLEEVES WILL OPEN IN 1 1/2 SECONDS AND CLOSE IN 4 1/2 SECONDS WHEN YOU OPERATE THE LEVERS. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(b)
Put the flap control lever in the 5 unit detent to extend the LE flaps pneumatically. 1) Make sure the LE flaps extend fully in approximately ten
seconds.
(c)
Put the flap control lever in the full UP detent to retract the flaps pneumatically. 1) Make sure the LE flaps retract fully in approximately ten
seconds after the TE flaps are retracted.
G. Put the Airplane Back to Its Usual Condition
S 862-083
(1)
Do this task if hydraulic power is not necessary for hydraulic systems No. 1 and 4: "Hydraulic System Depressurization" (AMM 29-11-00/201).
S 862-084
(2)
Do this task if pneumatic power is not necessary: "Pneumatic Power Removal" (AMM 36-00-00/201).
S 862-085
(3)
Do this task if electric power is not necessary: "Electric Power Removal" (AMM 24-22-00/201).
TASK 27-81-03-002-086
8. Rectifier and Primary Solenoid Valve Assembly Removal_____________________________________________________
A. Special Tools and Equipment
(1)
17MIT65B04017 Leading Edge Flap Drive Unit Lock
B.
References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 27-81-00/201, Leading Edge Flap System
(3)
AMM 29-11-00/201, Main Hydraulic Supply System
(4)
AMM 36-00-00/201, Pneumatic System
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