(2)  
The two stabilizer position indicators are electrically driven by the synchro transmitters in the left and right LSTM's. The synchro in the center LSTM is used for flight recorder information.

 (3)  
The RVDT's in the three LSTM's signal stabilizer trim position to corresponding SPM's.

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A

757
MAINTENANCE MANUAL

FIRST OFFICER'S 
SEE  A  STABILIZER TRIM 
POSITION INDICATOR 
SEE  B 
FLIGHT COMPARTMENT 
GREEN BAND RANGE 
(2.0 TO 7.0 UNITS OF TRIM) 
SEE  B 
INDICATING TAPE 
FWD 
AMBER AND WHITE  CAPTAIN'S 
OFF INDICATION  STABILIZER TRIM 
POSITION INDICATOR 
A 

ELECTRICAL CONNECTOR
STABILIZER TRIM POSITION INDICATOR
B
Stabilizer Trim Position Indicator Figure 1 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH STAB TRIM LEVERS ON THE ú

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757
MAINTENANCE MANUAL

SEE  C  POSITION INDICATOR FIRST OFFICER'S STABILIZER TRIM 
SEE  D 
FLIGHT COMPARTMENT 
GREEN BAND RANGE (2.0 TO 7.0 UNITS OF TRIM) 
INDICATING TAPE  FWD 
AMBER AND WHITE OFF INDICATION  POSITION INDICATOR STABILIZER TRIM CAPTAIN'S SEE  D 
C 

ELECTRICAL CONNECTOR
STABILIZER TRIM POSITION INDICATOR
D
Stabilizer Trim Position Indicator Figure 1 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH ALTERNATE STAB TRIM ú

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A

STABILIZER TRIM CONTROL
A
MODULE (STCM) (2 LOCATIONS) FWD
L
COMPONENT FUNCTION
UP LIMIT SWITCH 1
FLAPS RETRACTED UP LIMIT SWITCH 2
FLAPS NOT RETRACTED
SWITCH 3 D0WN LIMIT
GREEN
SWITCH 4 BAND
RVDT SPM (L)
CAPTAIN'S
SYNCHRO INDICATOR
ELECTRICAL CONNECTOR
757
MAINTENANCE MANUAL

STABILIZER TRIM LIMIT SWITCH AND POSITION TRANSMITTER MODULE (LSMT)
RIG PIN HOLE (EXAMPLE)
(EXAMPLE)
SEE B
STABILIZER TRIM BALLSCREW ACTUATOR
SWITCH  A
SEE A
ACTUATION
A CAMS
GEARS

RVDT
SYNCHRO
SPLINED INPUT SHAFT (MISSING TOOTH)
MICRO SWITCH (EXAMPLE)
LSTM INTERNALS (EXAMPLE)
C
COMPONENT FUNCTION
UP LIMIT SWITCH 1
FLAPS RETRACTED UP LIMIT
SWITCH 2 FLAPS NOT RETRACTED
SWITCH 3 D0WN LIMIT
GREEN
SWITCH 4 BAND
RVDT SPM (C)
NOT
SYNCHRO USED
ELECTRICAL
CONNECTOR

LSTM FUNCTIONS
A-A

B R COMPONENT
FUNCTION
UP LIMIT SWITCH 1
FLAPS RETRACTED UP LIMIT
SWITCH 2 FLAPS NOT RETRACTED
SWITCH 3
DOWN LIMIT GREEN
SWITCH 4 BAND
RVDT
SPM (R) F/O'SSYNCHRO INDICATOR
ELECTRICAL
CONNECTOR

Stabilizer Trim Limit Switch and Position Transmitter Modules
Figure 2 (Sheet 1)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH STAB TRIM LEVERS ON THE ú

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 CONTROL STAND  ú ú 03 Page 4 ú Jun 20/93
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757 MAINTENANCE MANUAL
　
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