S 014-003
 S 014-004
 S 494-006
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A
737-300/400/500MAINTENANCE MANUAL
10. LOCKNUT
12. INPUT ROD
8. SUPPORT BRACKET
7. BEARING ASSEMBLY9. MICROADJUSTMENT ROD
AFT CONTROL QUADRANT
FWD
A
Feel and Centering Unit Installation Figure 401
6. OUTPUT CRANK
11. NEUTRAL  SHIFT SENSOR
1. MACH TRIM  ACTUATOR
SEEA
2.
 FEEL AND  CENTERING UNIT

3.
 FEEL ACTUATOR

5. OUTPUT ROD
4. CRANK
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737-300/400/500MAINTENANCE MANUAL
 S 014-008
 (5)
Do this task: "Mach Trim Actuator Removal" (Ref 22-21-11/401).

 S 024-007

 (6)  
Remove the centering unit (Fig. 401):

 (a)  
Disconnect the output rod (5) from the crank (4) of the aft control quadrant.

 (b)  
Disconnect the microadjustment rod (9) from the centering unit.

 (c)  
Disconnect the hydraulic lines.

 (d)  
Remove the four bolts that attach each bearing assembly (7) to the support bracket (8).

 (e)  
Remove the centering unit (2) from the airplane.

 TASK 27-31-64-404-002
 3.  Feel and Centering Unit Installation (Fig. 401)____________________________________
 A. Special Tools and Equipment
 (1)  Rig Pin (E-5) - 0.309/0.311 inch diameter, 6.7 |0.25 inches long (MS20392-4)
 NOTE: The rig pin is part of the rig pin kit F70207-69, -78 or -83.
____
 (2)  
F80055-1 - Trammel Bar

 B.
References

 (1)  
12-12-00/301, Hydraulic Servicing

 (2)  
22-21-11/401, Mach Trim Actuator

 (3)  
22-11-14/501, Elevator Neutral Shift Sensor

 (4)  
27-31-00/201, Elevator and Tab Control System

 (5)  
27-31-00/501, Elevator and Tab ControlSystem

 (6)  
27-31-64/601, Feel and Centering Unit

 C.
Access

 (1)  
Location Zone
 704 Tail Cone
 711 Elevator and Tab, LH
 712 Elevator and Tab, RH

 (2)  
Access Panels
 3701 Stabilizer Trim Access Door
 3801 Tail Cone Access Door, LH
 3802 Tail Cone Access Door, RH

 D.
Procedure

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737-300/400/500MAINTENANCE MANUAL
 S 224-024 CAUTION: YOU MUST CAREFULLY DO THE TASK BELOW BEFORE YOU INSTALL THE
_______
 CENTERING UNIT.  FAILURE TO DO THE STEPS CORRECTLY CAN CAUSE
 DAMAGE TO THE EQUIPMENT.
 (1)  If it is necessary do this task: " Feel and Centering Unit Wear Limits Inspection" (Ref 27-31-64/601). (a) If the recommended inspection is done, adjust the input rods of the neutral shift and the output rod of the feel and centering unit in this task: "Adjustment - Elevator and Tab Control System" (Ref 27-31-00/501).
 S 424-011
 (2)  Install the centering unit (2) (Fig. 401): (a) Install the feel actuator to the feel and centering unit if not already installed (b) Set the centering unit (2) on the support bracket (8) between the flanges. (c) align the bolt installation holes in the bearing housing and the bracket.
 (d) (e)  Install the four bolts through each bearing assembly (7) in the support bracket (8).Attach the microadjustment rod (9) to the centering unit. Make sure that the index mark on the neutral shift sensor shaft
　
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