S 284-023

 (6)  
Make sure that the column shakers stop.

 B.
Put the airplane back to its original condition.

 (1)
Remove electrical power if it is not necessary (Ref 24-22-00).

 S 864-024
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A

757 MAINTENANCE MANUAL
 ELEVATOR POSITION INDICATING SYSTEM - DESCRIPTION AND OPERATION
_______________________________________________________________
 1.  General (Fig. 1)_______
 A.  Elevator position indication is provided by a surface position indicator on the EICAS screen. Elevator position transmitters send left and right elevator position data to the left and right EICAS computers. The EICAS computers process the signals and display the elevator position on the surfaces position indicator. The indicator appears on the lower EICAS screen when the STATUS button is pressed.
 2.  Component Details (Fig. 1)_________________
 A.  Elevator Position Transmitter
 (1)  The elevator position transmitter is a synchro transmitter. The transmitter consists of a stator, rotor, housing assembly, and a shaft assembly. The elevator position transmitter rotor is connected by a crank arm and pushrod to the elevator. Each transmitter is connected to the stabilizer rear spar near the fuselage. The transmitters send position data to the left and right EICAS computers.
 3.  Operation (Fig. 1)_________
 A.  Functional Description
 (1)  The elevator position indicating system is powered by a 28v, 400 Hz AC Bus. The 400 Hz output from the aircraft power supply is received by the synchro rotor input, and is inductively coupled to the stator of the transmitter. The rotor is mechanically connected to the aircraft control surface, so that the rotor turns simultaneously with the control surface. When the rotor changes position, the output from the stator also changes. The output from the transmitters is sent to the left and right EICAS computers. The surfaces position indicator appears on the EICAS screen when the STATUS button is pushed, showing elevator position. The indicator will disappear when the STATUS button is pushed a second time.
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A

757
MAINTENANCE MANUAL

Elevator Position Indicating Systems
Figure 1

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757
FAULT ISOLATION/MAINT MANUAL

ELEVATOR POSITION INDICATING SYSTEM

GUN 004-999
Elevator Position Indicating System - Component Index
Figure 101

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E50053
A
757 FAULT ISOLATION/MAINT MANUAL
OVERHEAD PANEL, P11

HORIZONTAL STABILIZER AND ELEVATOR (BOTTOM VIEW)
LEFT OR RIGHT ELEVATOR POSITION TRANSMITTER,

A

GUN 004-999
Elevator Position Indicating System - Component Location Figure 102
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