S 412-034
(3)
Close the 313AL and any other access door open (AMM 06-42-00/201, AMM 52-48-06/401).
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A
757 MAINTENANCE MANUAL
RUDDER POSITION INDICATING SYSTEM - DESCRIPTION AND OPERATION
_____________________________________________________________
1. General_______
A. The rudder position indicating system shows the amount of deflection of the rudder surface. This system does not include the rudder trim indication system.
2. Component Details_________________
A. Position Transmitter (Fig. 1)
(1)
The rudder position transmitter is mounted below the lower power control actuator. The transmitter's crank is attached to the rudder front spar by an adjustable control rod. The position transmitter is clamped to a bracket mounted to a vertical fin rib. Access to transmitter is through panel 324BL.
(2)
Electrical power to the transmitter is controlled by RUDDER POS circuit breaker on overhead circuit breaker panel P11.
B.
EICAS Position Indicator (Fig. 2)
(1)
The EICAS rudder position indicator appears on the lower EICAS display on the pilot's center instrument panel P2. The indicator is driven by the left or right EICAS computer on equipment shelf E4. The indicator scale in each direction is equal to 34 degrees.
3. Operation_________
A. The left power bus supplies 28 volts ac to the rotor in the transmitter, which is inductively coupled to the stator. The rotor is mechanically connected to the airplane control surface and rotates with the surface at the same time. Movement of the rudder changes the rotor position which in turn changes the stator output. This output signal is interpreted by the EICAS computers and displayed on the flight deck. The control surface position is displayed on the left corner of the lower EICAS screen. Press the EICAS status button on panel P9 for display.
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757
MAINTENANCE MANUAL
SEE B
RUDDER FRONT SPAR
ROD ADJUSTMENT
SEE A
PANEL 324BL
CRANK
FWD CLAMP
TRANSMITTER
SEE C CLAMP MOUNTING
BOLTS (2)
ELECTRICAL
CONNECTOR
A
RUDDER TO
HINGE ATTCH TRANSMITTER SHAFT
ATTCH TO RUDDER FRONT SPARCRANK SHAFT INDEXROD ADJUSTMENT MARK
PLAN VIEW
TRANSMITTER INSTALLATION
POSITION TOP VIEW TRANSMITTER
HOUSING
B
INDEX MARKS
C
Rudder Position Transmitter Figure 1
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757
MAINTENANCE MANUAL
Rudder Position Indication
Figure 2
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757
FAULT ISOLATION/MAINT MANUAL
RUDDER POSITION INDICATING SYSTEM
* SEE THE WDM EQUIPMENT LIST
Rudder Position Indicating System - Component Index
Figure 101
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