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757 MAINTENANCE MANUAL
ALIGNMENT TAB ON THE STABILIZER LEADING EDGE

Stabilizer Trim Alignment Tabs Installation
Figure 401

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757
MAINTENANCE MANUAL

BALLSCREW
ACTUATOR

Stabilizer Ballscrew Actuator - Stabilizer Trim Alignment Tabs Installation
Figure 402

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757 MAINTENANCE MANUAL
 (4)  S 934-005Put the alignment tab on the side of the airplane such that the conditions that follow are correct: (a) The alignment tab is one inch in front of the stabilizer leading edge. (b) The alignment tab aligns with the alignment tab on the stabilizer leading edge for the applicable Dimension B.
 (5)  S 424-008Install the alignment tabs (AMM 20-10-15/401).

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 STABILIZER TRIM POSITION INDICATING SYSTEM - DESCRIPTION AND OPERATION
______________________________________________________________________
 1.  General_______
 A.  Stabilizer trim position is provided by two independent indicators. The indicators are located on the left and right sides of the control stand. They are equipped with greenband range denoting safe takeoff stabilizer trim setting.
 B.  Stabilizer trim position is sensed by three stabilizer trim limit switch and position transmitter modules (LSTM's). The LSTM's are driven by cables attached to the stabilizer. The left and right LSTM's transmit position data to the stabilizer position indicators.
 C.  The LSTM's also provide:
 (1)  
Electrical travel limits to Horizontal Stabilizer Control System (Ref 27-41-00).

 (2)  
Data for takeoff configuration warning and annunciation.

 (3)  
Stabilizer position data to Stabilizer Position Modules (SPM's).

 D.  
The SPM's provide stabilizer position data to:

 (1)  
Autopilot Flight Director System (AFDS) (AMM 22-12-00).

 (2)  
Stabilizer Trim/Elevator Asymmetry Limiter Modules (SAM's) (AMM 27-41-00).

 2.  Component Details_________________
 A.  Stabilizer Position Indicators (Fig. 1)
 (1)  Stabilizer trim position is displayed by two indicators on the control stand. The indicators show stabilizer position from 0 to
 15.5 units of trim. The indicators receive their inputs from synchro transmitters in the LSTM's. A greenband on the face of each indicator shows the range of stabilizer settings for safe takeoff. The greenband range is from 2.0 to 7.0 units of trim. If a power failure occurs, the indicators will show an OFF flag at the bottom of the indicator. If a signal loss occurs, the indicator's tape will disappear out of view.
 B.  Stabilizer Trim Limit Switch and Position Transmitter Module (LSTM) (Fig. 2)
 (1)  
The stabilizer control system uses three interchangeable LSTM's, each connected via a cable system to the leading edge of the stabilizer torque box. The LSTM's are mounted just forward of and below the stabilizer in Section 48. Each LSTM contains two position transmitters (one synchro and one rotary variable differential transducer (RVDT)), three travel limit switches, and a greenband switch.
　
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