S 715-010

 (7)  
Make sure the VALVE CLOSED indicator light comes on.

 S 715-013

 (8)  
Make sure the surfaces (controlled by the system with the shutoff wing valve) stop to operate.

 S 865-011

 (9)  
Remove hydraulic power (AMM 29-11-00/201).

 (10)
 Remove electrical power (AMM 24-22-00/201).

 S 865-012
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 1.

2.

3.

4.

A
747-400 MAINTENANCE MANUAL
 AILERON POSITION INDICATING SYSTEM - DESCRIPTION AND OPERATION
______________________________________________________________
General (Fig./1)
_______
 A.  The aileron position indicating system provides visual indication on the flight deck of the angular displacement of each aileron. The aileron position indicators appear on the EICAS status page as part of the surface position display.
 B.  Components used by the aileron position indicating system are the four aileron position transmitters, the spoiler/aileron surface position digitizer circuit card, and the EIU's and EICAS display. The system is powered by 28 volts dc from the 28 vdc bus 4 and by 28 volts ac from the 28 vac bus 4 through circuit breakers on the P6 panel.
Aileron Position Transmitter
____________________________
 A.  The aileron position transmitters are located between each aileron and the wing rear spar. An adjustable control rod attaches the transmitter crank to the aileron. With the aileron in the neutral position, the control rod can be adjusted to set the aileron position readout at zero degree for inboard ailerons or 0.6 degrees down for outboard ailerons on the EICAS flight controls maintenance page.
Surface Position Digitizer
__________________________
 A.  The forward surface position digitizer circuit card YMLA09 receives the signals from the aileron position transmitters and converts the signals to a serial digital format for transmission to the EIU's on an ARINC 429 bus. The card is installed in the forward electrical systems card file M7603 in the main electrical equipment center.
Operation (Figs. 2 and 3)
_________
 A.  Functional Description
 (1)  
As the aileron is deflected from the neutral position, the attached control rod drives the transmitter crank which pivots the transmitter shaft. The transmitter electrical output varies as the shaft pivots. The output signal passes to the surface position digitizer which processes the signal and routes it to the EIU's for display on EICAS.

 B.  
Control

 (1)  
Operation of the aileron position indicating system is automatic. The EICAS surface position display appears when the EICAS status page is invoked.

 (2)  
The flight controls maintenance page may be called up on the auxiliary EICAS display. This page displays the values of aileron angular displacement as numeric readouts for system adjustment and trouble shooting.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

AILERON POSITION INDICATION ON AUXILIARY EICAS DISPLAY
SEE A
SEE B
INBOARD  POSITION 
AILERON  TRANSMITTER 
OUTBOARD 
AILERON 
INBD 
INBD 
POSITION 
TRANSMITTER 

A
____LEFT AILERON POSITION TRANSMITTERS SHOWN.  B
NOTE: RIGHT TRANSMITTERS SIMILAR.
Aileron Position Indicating System Component Location Figure 1
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