(3)
Remove access door 3802 on the tail cone (AMM 12-31-41/201).

 (4)
Open the stabilizer trim access door 3701 (AMM 12-31-41/201).

 S 015-004
 S 015-005
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 825-006
 (5)  Set the horizontal stabilizer at 3 units of trim equal to the jackscrew "B" dimension of 41.57 |0.01 inches (AMM 27-41-81/401, Stabilizer Jackscrew Setting). Use the trammel bar to make sure the "B" dimension is correct (Fig 501, Sheet 1).
 NOTE: One person must be in the tail with a headset and one person
____
 must be in the control cabin.

 S 085-007
 (6)  
Remove the trammel bar.

 S 035-008

 (7)  
Disconnect the airplane wires from the Mach Trim Actuator.

 S 485-009

 (8)
Connect the test box to the Mach Trim Actuator (Fig 501 sheet 2).

 S 485-010

 (9)  
Connect the VTVM to the RVT output on the test box.

 S 865-011
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
_______ SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. AILERONS, RUDDERS, ELEVATORS FLAPS, SLATS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS CAN MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (10) Supply hydraulic power (AMM 29-15-00/201, Hydraulic Systems).
 F. Mach Trim Actuator Test
 S 725-015
 (1)  Do these steps to do a test of the mach trim actuator.
 (a)  
Set the power switch on the test box to the ON position.

 (b)  
Set the speed switch on the test box to 12uf.

 (c)  
Operate the actuator with the direction control (EXTEND/RETRACT) on the test box to get a null on the VTVM (100mV maximum).

 (d)  
Set the speed switch on the test box to 2uf.

 (e)  
Operate the actuator with the direction control (RETRACT) to get a value of 17.6 +/- 0.3V AC on the VTVM.

 (f)  
Make sure the time to retract the actuator is between 10 and 19 seconds.

 (g)  
Move the aft control quadrant in the tail cone (Fig 501, sheet 2) to make sure the system is in the center, then release.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
 (h)  
Measure the right elevator position, in inches, up from the index mark on the tail cone (Fig 501, sheet 3) and write the position down.

 (i)  
Operate the actuator with the direction control (EXTEND) to get a value of 0 +/- 0.100V AC on the VTVM.

 (j)  
Make sure the time necessary to retract the actuator is between 10 and 19 seconds.

 (k)  
Move the aft control quadrant in the tail cone to make sure the system is in the center, then release it.

 (l)  
Measure the right elevator position, in inches, up (or down) from the index mark on the tail cone and write the position down.

 (m)  
Calculate the distance the elevator moved from the value in step (h) to the value from step (l).

 (n)  
Make sure that the distance is 2.52 |0.25 inches.

 NOTE: This is the same as an angular movement of 4.20 |0.25
____
 degrees.

 G. Put the airplane back to its initial condition
 S 085-016
 (1)  
Disconnect the VTVM.

 S 085-017

 (2)  
Remove the test box from the Mach Trim Actuator.

 S 435-018

 (3)  
Connect the airplane wire.

 S 865-019

 (4)  
Remove hydraulic power.

 S 415-020

 (5)  
Install access panel 3802 on the tail cone.

 S 415-021

 (6)  
　
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