(3)  
Make sure the crank arm of the neutral shift mechanism can move freely between the clevis of the actuator arm.

 S 434-010
 CAUTION: MAKE SURE THAT YOU TURN THE NEUTRAL SHIFT CRANK IN THE UP
_______ DIRECTION. IF YOU INSTALL THE NEUTRAL SHIFT CRANK INCORRECTLY, THE STABILIZER CAN MOVE QUICKLY WHEN YOU ENGAGE THE AUTOPILOT. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (4)  Install the Double Bolt:
 (a)  
Install the double bolt, two washers, and the large nut that attaches the actuator arm to the neutral shift mechanism.

 (b)  
Tighten the nut to 85-100 pound-inches.

 CAUTION: DO NOT CHANGE THE TORQUE ON THE LARGE NUT AFTER YOU
_______ TIGHTEN THE SMALL NUT. IF CHANGED, THE TORQUE VALUE WILL BE INCORRECT.
 (c)  
Install the washer and the small nut on the double bolt.

 (d)  
Tighten the nut to 30-35 pound inches.

 (e)  
Tighten the mounting bolts on the side to 20-25 pound-inches.

 S 434-023
 (5)  
Install the electrical connector to the mach trim actuator.

 S 094-024

 (6)  
Remove the rigging pin E-5 from the aft control quadrant.

 S 724-025

 (7)  
Do the mach trim actuator A/T (Ref 22-21-11/501).

 F. Put the airplane back to its initial condition.
 S 414-026
 (1)  
Install the access panel 3802.

 S 864-027

 (2)
Make sure you remove the tags and close these circuit breakers:

 (a)  P6-2 Circuit Breaker Panel
 1) AUTO FLT CONT SYS B MACH TRIM AC

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 22-21-11
 ALL  ú ú 01 Page 406 ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 2) AUTO FLT CONT SYS B MACH TRIM DC
 (b)  P18-1 Circuit Breaker Panel 1) AUTO FLT CONT SYS A MACH TRIM AC 2) AUTO FLT CONT SYS A MACH TRIM DC
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 22-21-11
 ALL  ú ú 01 Page 407 ú Mar 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 MACH TRIM ACTUATOR - ADJUSTMENT/TEST
____________________________________
 1.  General
 A.  This procedure contains two tasks. The first task is a test of the Mach Trim actuator. There are two Mach Trim Actuator tests provided, but one of the tests are necessary. These tests use:
 (1)  
C22003-22 test box

 (2)  
DFCS BITE (-912 and on FCC)

 B.  The second task is a BITE test of the Mach Trim System.
 TASK 22-21-11-725-001
 2.  Mach Trim Actuator Test (C22003-22 test box)
_______________________
 A.  Special Tools and Equipment
 (1)  
F80055-1, Actuator Trammel Bar

 (2)  
C22003-22, Test Box - Elevator Control System, Mach Trim Actuator

 B.  Standard Tools and Equipment
 (1)  VTVM - Fluke (digital)
 C.  References
 (1)  
AMM 12-31-41/201, Body Section 48, Access doors and panels

 (2)  
AMM 24-22-00/201, Electrical Power Control

 (3)  
AMM 27-41-00/501, Horizontal Stabilizer Trim Control System

 (4)  
AMM 29-15-00/201, Hydraulic Systems

 D.  Access
 (1)  
Location Zone
 705 Tail Cone Access Door

 (2)  
Access Panels
 3802 Tail Cone Access Door
 3701 Stabilizer Trim Access Door

 E.  Prepare for Test
 S 865-002
 (1)  
Supply electrical power (AMM 24-22-00/201, Electrical Power Control).

 S 865-003

 (2)  
Make sure these circuit breakers are closed:

 (a)  
P6-2 circuit breaker panel 1) AUTO FLT CONT SYS B MACH TRIM AC 2) AUTO FLT CONT SYS B MACH TRIM DC

 (b)  
P18-1 circuit breaker panel 1) AUTO FLT CONT SYS A MACH TRIM AC 2) AUTO FLT CONT SYS A MACH TRIM DC
　
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