(2)  
The installation of the neutral shift mechanism.

 TASK 27-31-91-004-001
 2.  Elevator Neutral Shift Mechanism Removal
________________________________________
 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

 (3)  
F71336-501 - Stabilizer Trim Lock

 B.  
References

 (1)  
27-31-00/201, Elevator and Tab Control System

 C.  
Access

 (1)  
Location Zone
 101 Control Cabin, LH
 102 Control Cabin, RH
 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

 S 864-002
 (1)  
Do this task: "Remove the Elevator Hydraulic Systems A and B" (Ref 27-31-00/201).

 (2)  
Remove the access panel 3801 or 3802.

 (3)  
Open the access door 3701.

 S 864-005

 (4)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P6 Circuit Breaker Panel
 1) STABILIZER TRIM ACTUATOR

 S 014-003
 S 014-004
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 2) STABILIZER TRIM CONT
 3) AUTO FLT CONT SYS B MACH TRIM AC
 4) AUTO FLT CONT SYS B MACH TRIM DC
 5) AFDS MCP CRS-2
 6) AUTO FLT CONT SYS B SNSR EXC AC
 7) AUTO FLT CONT SYS B FCC DC
 8) AUTO FLT CONT SYS B ENGAGE INTLK B
 9) AUTO FLT CONT SYS B WARN LIGHT BAT

 (b)  P18 Circuit Breaker Panel
 1) AUTO FLT CONT SYS A MACH TRIM AC
 2) AUTO FLT CONT SYS A MACH TRIM DC
 3) AFDS MCP DC
 4) AFDS AIL FORCE LIM (Not on 737-500)
 5) AUTO FLT CONT SYS A SNSR EXC AC
 6) AUTO FLT CONT SYS A FCC DC
 7) AUTO FLT CONT SYS A ENGAGE INTLK A
 8) AUTO FLT CONT SYS A WARN LIGHT BAT

 S 034-006
 (5)  
Disconnect the electrical connectors D700 from the stabilizer trim actuator and D381 from the autopilot stabilizer trim servo.

 S 494-007

 (6)  
Install the stabilizer trim lock on the stabilizer trim wheel at the control stand (Fig. 402).

____NOTE: THE STABILIZER TRIM JACKSCREW SHOWN WITH THE STABILIZER LEADING EDGE AT ZERO DEGREES. 
1  THE "B" DIMENSION IS MEASURED BETWEEN THE CENTER OF THE UPPER AND LOWER GIMBAL PINS  "B" DIM  1  TRAMMEL BAR 

FWD
Stabilizer Trim Jackscrew Setting
Figure 401

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (a)  
Turn the trim wheel to put the handle at the top of the wheel.

 (b)  
Adjust the height of the trim lock to put the trim wheel handle correctly in the bottom of the yoke.

 (c)  
Install the pin through the yoke.

 (d)  
Install the safety pin.

 S 494-008
 (7)  
Install the rig pin E-5 in the aft control quadrant (Fig. 403).

 S 024-009

 (8)  
Remove the neutral shift mechanism:

 (a)  
Remove the bolt and the locknuts to disconnect the neutral shift crank from the mach trim actuator (Fig. 404).

 (b)  
Disconnect the aft ends of the input rods from the neutral shift crank.
　
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