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STAB TRIM 
LIMIT SWITCHES 
(AIRPLANE NOSE UP) 
SEE  B 
ACTUATOR 
TABLE I  TRAMMEL 
"B"  BAR 
UNITS  "B"  DIMENSION 
SWITCH  OF  DIMENSION  1 
TRIM 
STAB AUTOPILOT AND 
PSTA LIMIT SWITCH 
(NOSE DOWN)  0.25  45.49 |0.05 
(FLAPS NOT UP) (S145) 
2.5  42.28 |0.05 
PSTA LIMIT SWITCH  737-300  737-300 
(FLAPS UP) (NOSE DOWN) (S844)  AND -500 737-400 2.8  41.85 |0.05 737-400 AND -500  FWD 
PSTA  A 
LIMIT SWITCH  12.5  27.88 |0.05 
(NOSE UP) (S115) 
STAB AUTOPILOT LIMIT 
SWITCH (NOSE UP)  14.0  25.70 |0.05 
(S144) 

1 THE "B" DIMENSION IS MEASURED BETWEEN THE CENTER OF THE UPPER AND LOWER GIMBAL PINS
Stabilizer Trim Limit Switch Installation
Figure 401 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
L86871
A 737-300/400/500MAINTENANCE MANUAL 
(AMM 31-26-24/401) SWITCH, S546 STAB TAKEOFF WARNING 
STAB AUTOPILOT AND ELEC ACTUATOR LIMIT SWITCH, S145 SEE C E 
LIMIT SWITCH, S844 SEE C E STAB ELEC ACTUATOR BRACKETS MOUNTING SWITCH 
CAM 
(AMM 31-26-24/401) SWITCH, S132 STAB TAKEOFF WARNING 
LIMIT SWITCH, S115 C D STAB ELEC ACTUATOR SEE 
FWD  B SWITCH, S144 SEE C D STAB AUTOPILOT LIMIT  BRACKET MOUNTING LOCKWASHER 
THE SWITCHES) (EXAMPLE OF LIMIT SWITCH SEE F  SWITCH ARM  C  WASHER  ARM NUT SWITCH  SWITCH NUT 
Stabilizer Trim Limit Switch Installation Figure 401 (Sheet 2) 

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
1.24 INCH (INSTALL THE SWITCH ARM IN APPROXIMATELY THIS POSITION BEFORE YOU ADJUST THE
MOUNTING SWITCH)
BRACKET

EXAMPLE OF LIMIT SWITCHES (S-115 AND S-144)
D
FREE POSITION OF THE SWITCH ARM MOUNTING

 SWITCH ARM NUT  (TIGHTEN AND SWITCH NUT 
ADJUST THE SWITCH) EXAMPLE OF LIMI E T SWITCHES (S-145 AND S- 844)  F EXAMPLE OF ALL S WITCHES 

Stabilizer Trim Limit Switch Installation
Figure 401 (Sheet 3)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 2) Pull the limit switch free from the bracket.
 TASK 27-41-94-404-007
 3.  Stabilizer Trim Limit Switches Installation (Fig. 401)
___________________________________________
 A.  References
 (1)  
AMM 12-31-41/201, Body Section 48 Access Doors and Panels

 (2)  
AMM 27-41-94/501, Stabilizer Trim Limit Switches

 B.  
Access

 (1)  
Location Zone
 701 Tail Compartment

 (2)  
Access Panels
 3701 Stabilizer Trim Access Door

 C.  
Procedure

 S 424-010
 (1)  
Install the limit switch:

 (a)  
Install the switch shaft: 1) Install the switch shaft through the mounting hole in the bracket. 2) Attach the switch in the position with the switch nut as shown in figure 401.

 3)  Install a lockwire to the switch nut and the mounting bracket.

 (b)  
Install the switch arm: 1) Turn the switch arm to the approximate position for installation. 2) Set the switch arm on the switch shaft to engage the serrations.
　
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