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Elevator Position Transmitter
______________________________
 A.  The elevator position transmitters are located between each elevator and the horizontal stabilizer rear spar. An adjustable control rod attaches the transmitter to the elevator. With the elevator in the neutral position, the transmitter can be adjusted to set the elevator position readout on the EICAS flight controls maintenance page to zero.
Surface Position Digitizer
___________________________
 A.  The aft surface position digitizer circuit card YM50001 receives the signals from the elevator 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 located in the aft SPD card file M8011 in the E8 aft electrical equipment rack.
Operation (Figs. 2 and 3)
_________
 A.  Functional Description
 (1)  
When the elevator 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 elevator 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 elevator angular displacement as numeric readouts for system adjustment and trouble shooting.

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A
747-400
MAINTENANCE MANUAL

DISPLAY AUXILIARY EICAS INDICATION ON ELEVATOR POSITION 
SEE  A  SEE  B 
TRANSMITTER POSITION 
RIB STABILIZER 

POSITION TRANSMITTER 
ELEVATOR OUTBOARD 
INBOARD ELEVATOR 
A 
STABILIZER RIB 
____NOTE:  MITTERS SIMILAR. MITTERS SHOWN. RIGHT TRANS-LEFT ELEVATOR POSITION TRANS- B 
Figure 1 Elevator Position Indicating System Component Location

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747-400
MAINTENANCE MANUAL

Elevator Position Indicating System EICAS Displays
Figure 2

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747-400
MAINTENANCE MANUAL

 

RUD/ELEV IND
28V AC
BUS 3
RUD/ELEV SNSR

P6 MAIN POWER DISTRIBUTION PANEL
CX T438 LEFT OUTBD ELEV POSN XMTR

CX T1672 LEFT INBD

 

ELEV POSN XMTR

T437 RIGHT OUTBD
YM5A1 SURFACEPOSITION DIGITIZER
ELEV POSN XMTR -AFT - RUD/ELEV
M8011 SURFACE POSITION DIGITIZER CARD FILE (E8 AFT RACK)
Elevator Position Indicating System Schematic

Figure 3

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 ELEVATOR POSITION INDICATING SYSTEM - ADJUSTMENT/TEST
_____________________________________________________
 1.  General_______
 A.  There are two tasks in this procedure. There is one task for the operational test and one task for the adjustment of the elevator position indicating system. The procedure has these parts:
　
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