B.
References

 (1)  
AMM 06-09-05/201, Body Section 48 Access Doors and Panels

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

 (3)  
AMM 29-11-00/201, Main Hydraulic Supply System

 C.
Access

 (1)  
Location Zone
 221 Control Cabin, LH
 222 Control Cabin, RH
 311 Area Aft of Pressure Bulkhead, LH
 312 Area Aft of Pressure Bulkhead, RH

 (2)  
Access Panel
 312A Horizontal Stabilizer Jackscrew Access Door

 D.
Procedure

 S 862-023
 (1)  
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).

 S 862-024

 (2)  
Set the STAB TRIM 2 switch on the control stand to CUTOUT and attach DO-NOT-MOVE tag.

 S 862-025

 (3)  
Set the STAB TRIM 3 switch to ON.

 S 862-019

 (4)  
Do this task to pressurize the hydraulic system No. 3: "Supply Hydraulic Power" (AMM 29-11-00/201).

 (5)  
Open the access door 312A (AMM 06-09-05/201).

 S 862-021

 (6)  
Make sure that a person in the 48 section can hear you in the control cabin.

 S 012-020
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 862-022
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE
_______ HORIZONTAL STABILIZER CONTROL SURFACES BEFORE YOU MOVE THE STABILIZER. A MOVEMENT OF THE STABILIZER CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (7)  
Make sure the "B" dimension agrees with the units of trim on the stabilizer position indicator:

 (a)  
Use the STAB TRIM ALTN switches on the control stand to move the stabilizer to the necessary position.

 (b)  
Set the STAB TRIM 3 switch to CUTOUT and attach DO-NOT-MOVE tag.

 (c)  
Measure the "B" dimension.

 (d)  
Make sure that the "B" dimension agrees with the units of trim shown in this table: Make sure that the "B" dimension agrees with the units of trim shown in this table:

 ~................................................................. | "B" inches (millimeters) | Units of Trim | ...................................................................
 |  1.22 |0.33 (31.0 |8.4)  |  0.25 |0.15  |
 |  2.46 |0.60 (62.5 |15.2)  |  0.80 |0.25  |
 |  4.71 |0.60 (119.6 |15.2) |  1.80 |0.25  |
 |  7.42 |0.05 (188.5 |1.3)  |  3.00 |0.25 (neutral)  |
 | 26.91 |0.60 (683.5 |15.2) |  11.60 |0.25  |
 | 31.21 |0.60 (792.7 |15.2) |  13.50 |0.25  |
 | 34.03 |0.33 (864.4 |8.4)  |  14.75 |0.15  |

 2...........................….....................................1
 (e)  Remove the DO-NOT-MOVE tags and set the STAB TRIM 2 and 3 switches to AUTO.
 S 862-018
 (8)  
If the hydraulic power is not necessary, do this task: "Remove Hydraulic Power" (AMM 29-11-00/201).

 S 862-016

 (9)  
If the electrical power is not necessary, do this task: "Remove Electrical Power" (AMM 24-22-00/201).

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 ALL  ú ú 02 Page 206 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 HORIZONTAL STABILIZER TRIM CONTROL SYSTEM - ADJUSTMENT/TEST
___________________________________________________________
 1. General
_______
 A. There are eight tasks in this procedure:
 (1)  
The existing faults check of the stabilizer trim/rudder ratio modules (SRM)

 (2)  
The operational test of the stabilizer trim control system

 (3)  
The operational test of the alternate stabilizer trim switches
　
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