S 862-027
(3)
Do this task if pneumatic power is not necessary: "Pneumatic Power Removal" (AMM 36-00-00/201).
TASK 27-81-00-862-028
6. Leading Edge Flaps Extension by Electrical Power________________________________________________
A. General
(1)
There are two control modes available to extend the flaps by electrical power. These two modes are the primary electric mode and the alternate electric mode.
(a)
In the primary electric mode, you move the flap control lever to extend the flaps.
(b)
In the alternate electric mode, you use the ALTN FLAPS switches on the pilots' center instrument panel to extend the flaps.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(2)
Two of the three flap control unit inputs are from the relays R7774, ALT FLAP SW RLY NO. 1, and R7775, ALT FLAP SW RLY NO. 2. The circuit breakers TE FLAP ELEC CONT OTBD and TE FLAP ELEC CONT INBD supply power to these relays. If these two circuit breakers are open, the flaps will be in the primary mode. If one of the two circuit breakers are open, the flaps will be in the alternate mode.
B.
References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 31-61-00/201, Integrated Display System
(3)
SSM 27-81-01, SSM 27-81-02, SSM 27-81-03, SSM 27-81-04
(4)
WDM 27-81-11, WDM 27-81-12, WDM 27-81-21, WDM 27-81-22,
WDM 27-81-31, WDM 27-81-32, WDM 27-81-41, WDM 27-81-42
C.
Access
(1)
Location Zone
221, 222 Control Cabin
D.
Procedure
S 862-029
(1)
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).
S 862-030
(2)
Do this task to make sure that the EICAS is serviceable: "Get the Airplane System Information" (AMM 31-61-00/201).
S 862-059
CAUTION: DO NOT ELECTRICALLY EXTEND OR RETRACT THE FLAPS MORE THAN ONE
_______ TIME IN 5 MINUTES. DAMAGE TO THE MOTOR CAN OCCUR IF THE MOTOR BECOMES TOO HOT.
(3) Extend the flaps in the primary electric mode:
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.
(a) 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).
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747-400 MAINTENANCE MANUAL
(b)
Move the flap control lever to the 5 unit detent to extend all the leading edge flaps.
(c)
Make sure that the multiple flap-primary FLAPS display on the main EICAS comes into view approximately 30 seconds after you moved the flap lever.
NOTE: The LE flap indicator boxes will look crosshatched white
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本文链接地址：747-400 AMM 飞机维护手册 飞行操纵 FLIGHT CONTROLS 7(48)
