737-300/400/500
MAINTENANCE MANUAL

TRIM
UNITS

0

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
17
STAB LE POSITION
3` UP
 2` UP
 1` UP
 0`
 1` DOWN
 2` DOWN
 3` DOWN
 4` DOWN
 5` DOWN
 6` DOWN
 7` DOWN
 8` DOWN
 9` DOWN 10` DOWN 11` DOWN 12` DOWN 13` DOWN
14` DOWN
"B" DIM  FWD 
45.84 (REF) BALLNUT AGAINST STOP 
44.42 43.00 41.57  "B" DIMENSION 1  TRAMMEL BAR 
40.15 
38.71 
37.28 
35.84 
34.40 
32.96 31.51 30.06  STABILIZER TRIM JACKSCREW EDGE AT ZERO DEGREES SHOWN WITH STABILIZER LEADING 
28.61 
27.16 
25.70 
24.24 
22.79 
BALLNUT AGAINST STOP 21.32 (REF)  1  "B" DIMENSION IS MEASURED BETWEEN CENTER OF UPPER AND LOWER GIMBAL PINS 

Stabilizer Trim Jackscrew Setting
Figure 502

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737-300/400/500MAINTENANCE MANUAL
 8)  Make sure the rig pins E-2 and E-3 move freely through the installation holes of the shoulder bolts (Fig. 504).
 9)  Make sure the tension in cables EAR, EBR, EAL, and EBL is in +/- 10 pounds of the table value at the ambient temperature (Fig. 501).
 (g)  Adjust the control cables EA and EB to their correct cable rigging tension: 1) Remove the bolts from the adjustable ends of the pitch
 force tranducer.
 2)  Use the turnbuckles to adjust the cable tension to the value for ambient temperature (Fig. 501).
 3)  Check the neutral position. a) Make sure the rig pins E-1, E-2, E-3, and E-5 move
 freely. 4) Adjust the pitch force transducers (AMM 22-11-92/501). 5) Connect the pitch force transducers. 6) Remove the rig pins E-2 and E-3. 7) Install the shoulder bolts. 8) Install the locking clips on all the turnbuckles. 9) Remove the rig pins E-1 and E-5.
 S 225-114
 (5)  
Check for proper location of the Index Plates. (AMM 27-31-81/401)

 S 825-042

 (6)  
AIRPLANES WITHOUT THE MECHANICAL STOP ON THE ELEVATOR BUS CRANK; Adjust the elevator pushrods:

 (a)  
Make sure that the elevators are adjusted correctly at the neutral position: 1) Hold the right elevator with the trailing edge aligned with

 the index mark (Fig. 505).
 NOTE: Measurements are done by a straight line point to
____ point from the center of the index mark to the upper aft inboard edge of each elevator.
 2)  Make sure the trailing edge of the left elevator aligns with the index mark in 0.12 inch or less.
 (b)  
If the elevators are not adjusted correctly at the neutral position, adjust the elevator (Fig. 505): 1) Install the rig pin E-5 in the aft control quadrant. 2) Do this task: "Power Control Unit Removal" (AMM

 27-31-14/401) to remove the right PCU. 3) Install the rigging and restraining tool in the position of the right PCU.

 (c)  
Make sure the right elevator aligns with the index mark in 0.12 inch or less.

 (d)  
If the elevator does not align, adjust the right rod end fitting: 1) Remove the bolt that attaches the elevator pushrod to the

 crank of the output torque tube.
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737-300/400/500
MAINTENANCE MANUAL

AUTOPILOT 
B ACTUATOR 
OUTPUT 
TORQUE 
TUBE 
NEUTRAL 
SHIFT 
SENSOR 

MACH TRIM
ACTUATOR

AUTOPILOT A ACTUATOR
ELEVATOR A PCU
FEEL AND CENTERING UNIT
ELEVATOR
STABILIZER B PCU
POSITION SENSOR
INPUT TORQUE TUBE AFT CONTROL QUADRANTS
　
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