(2)
The procedure to extend the leading edge flaps by pneumatic power is in paragraph 4.
(3)
The procedure to extend the leading edge flaps by electrical power is in paragraph 5.
TASK 27-81-00-862-019
3. Leading Edge Flaps Retraction
_____________________________
A. General
(1)
You can retract the leading edge flaps by pneumatic power or by electrical power. Use pneumatic power if you must extend or retract the LE flaps frequently. If you use electrical power, The limit is only one extension or retraction of the LE flaps every 5 minutes.
(2)
The procedure to retract the leading edge flaps by pneumatic power is in paragraph 6.
(3)
The procedure to retract the leading edge flaps by electrical power is in paragraph 7.
TASK 27-81-00-862-020
4. Leading Edge Flaps Extension by Pneumatic Power
_______________________________________________
A. References
(1)
AMM 36-00-00/201, Pneumatic System
(2)
SSM 27-81-05, SSM 27-81-06
(3)
WDM 27-81-81, WDM 27-81-82
B.
Access
(1)
Location Zone
221, 222 Control Cabin
C.
Procedure
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27-81-00
ALL ú ú 01 Page 202 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 862-022
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE FLAPS
_______ CONTROL SURFACES BEFORE YOU SUPPLY PNEUMATIC POWER. THE LE FLAPS CAN MOVE QUICKLY WHEN YOU SUPPLY PNEUMATIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(1) Do this task: "Supply Pneumatic Power" (AMM 36-00-00/201).
S 862-062
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.
CAUTION: MAKE SURE YOU LOWER THE INBOARD FAN COWL PANELS AND THE INBOARD
_______ REVERSER HALVES FOR NO. 1 AND 4 ENGINES BEFORE YOU OPERATE THE LEADING EDGE FLAPS. THIS CAN PREVENT THE ENGINE COWLING OR THRUST REVERSER HALVES FROM DAMAGE.
(2)
Move the flap control lever to the 1 unit detent to extend the group A leading edge flaps (the 8 inboard LE flaps on each wing).
S 862-053
(3)
Move the flap control lever to the 5 unit detent to extend all the leading edge flaps.
S 862-023
(4)
Do this task if pneumatic power is not necessary: "Pneumatic Power Removal" (AMM 36-00-00/201).
TASK 27-81-00-862-024
5. Leading Edge Flaps Retraction by Pneumatic Power________________________________________________
A. References
(1)
AMM 36-00-00/201, Pneumatic System
(2)
SSM 27-81-05, SSM 27-81-06
(3)
WDM 27-81-81, WDM 27-81-82
B.
Access
(1)
Location Zone
221, 222 Control Cabin
C.
Procedure
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-81-00
ALL ú ú 01 Page 203 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 862-026
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE FLAPS
_______ CONTROL SURFACES BEFORE YOU SUPPLY PNEUMATIC POWER. THE LE FLAPS CAN MOVE QUICKLY WHEN YOU SUPPLY PNEUMATIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
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