27-88-00
ALL ú ú 01 Page 3 ú Jun 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
Leading Edge Flap Position Indicating System Schematic
Figure 3
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27-88-00
ALL ú ú 01 Page 4 ú Jun 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(3)
The multiple flap-primary FLAPS display appears automatically when primary electric flaps are enabled, when there is flap asymmetry or disagreement with flap lever position, or when any LE or TE flap position data are determined to be invalid. This display consists of 4 white tapes which indicate position of each TE flap, a split bar across the tapes with a number which indicates position of the flap lever, and 6 box-shaped symbols above the tapes which indicate position of the LE flaps.
(a)
The 6 box-shaped symbols above the tapes indicate status of the inboard, midspan, and outboard groups of LE flaps on each wing. The box outline appears alone in white for LE flaps fully retracted, the entire box is shaded green for LE flaps fully extended, and the box is crosshatched in white for LE flaps in transit. Any of these symbols appears in amber to indicate a disagreement with flap lever position.
(b)
When any LE position data is invalid (LE flap position switch indicates extended and retracted simultaneously), the corresponding LE indicator box outline will appear in white with an amber x inside.
(4)
The multiple flap-alternate FLAPS display appears automatically when alternate flaps are selected with the flap ALT ARM switch or when all 3 flap control units fail. This display is the same as the multiple flap-primary display except that the flap lever position bar and number do not appear, and flap position scales appear next to the outer tapes.
B.
Control
(1)
Operation of the leading edge flaps indication system is automatic. The expanded FLAPS display appears on the main EICAS during non-normal flap configurations.
(2)
The flight controls maintenance page may be called up on the auxiliary EICAS display. This page displays position of each of the eight LE flap PDU's as RET (retracted), EXT (extended), or INT (in transit).
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27-88-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
LEADING EDGE FLAP POSITION INDICATING SYSTEM -
______________________________________________ ADJUSTMENT/TEST
_______________
1. General_______
A. This subject has one task. The task is an operational test of the leading edge flap position indicating system. The procedure has these parts:
(1)
The deactivation of the trailing edge (TE) flaps
(2)
The extension and retraction of the leading edge (LE) flaps
(3)
An examination of the position indication on EICAS.
TASK 27-88-00-715-001
2. Operational Test - Leading Edge Flap Position Indicating System_______________________________________________________________
A. References
(1)
24-22-00/201, Manual Control
(2)
27-51-00/201, Trailing Edge Flap System
(3)
29-11-00/201, Main Hydraulic Supply System
(4)
36-00-00/201, Pneumatic System
(5)
SSM 27-88-01, 27-88-02
(6)
WDM 27-88-11, 27-88-12
B.
Access
(1)
Location Zone
221 Control Cabin, LH
222 Control Cabin, RH
C.
Procedure
S 865-010
(1)
Do this task: "Trailing Edge Flap Deactivation" (Ref 27-51-00/201).
S 865-002
(2)
Do this task: "Supply Electrical Power" (Ref 24-22-00/201).
S 865-004
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE FLAP
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