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 ALL  ú ú 05 Page 18 ú Feb 18/00
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A
747-400 MAINTENANCE MANUAL
 AUTOMATIC STABILIZER TRIM SYSTEM - ADJUSTMENT/TEST
__________________________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task is for the operational test of the Automatic Stabilizer Trim System. The second task is for the system test of the Automatic Stabilizer Trim System.
 (1)  
The operational test contains the Existing Faults Check and the Stab Trim Ground Test. The Existing Faults Check makes sure that there are no failures in the Stabilizer Trim/Rudder Ratio Modules (SRMs). The Stab Trim Ground Test makes sure that the FCC can send signals to the SRMs and the stabilizer trim control modules to move the horizontal stabilizer in the up and down directions. It makes sure that the autotrim mode of the SRMs operates correctly.

 (2)  
The system test uses the Central Maintenance Computer System (CMCS) to examine the interfaces of the automatic stabilizer trim system. It makes sure that the automatic stabilizer trim system operates correctly.

 B.  You can use one of the Control Display Units (CDU) to start the CMCS tests. The printer (optional) permits you to make a copy of the results of the CMCS tests. This printer is on the aft electronics control panel (P8).
 C.  When you do the operational test or the system test, make sure these systems are serviceable:
 (1)  
Integrated Display System (AMM 31-61-00/501).

 (2)  
Air Data System (AMM 34-12-00/501).

 (3)  
Inertial Reference System (AMM 34-21-00/501).

 (4)  
Radio Altimeter System (AMM 34-33-00/501).

 (5)  
Flight Management Computer System (AMM 34-61-00/501).

 (6)  
Central Maintenance Computer System (AMM 45-10-00/501).

 TASK 22-22-00-745-001
 2.  Operational Test - Automatic Stabilizer Trim System___________________________________________________
 A.  General
 (1)  The operational test contains the Existing Faults Check and the Stab Trim Ground Test. The Existing Faults Check makes sure that there are no failures in the Stabilizer Trim/Rudder Ratio Modules (SRMs). The Stab Trim Ground Test makes sure that the FCC can send signals to the SRMs and the stabilizer trim control modules to move the horizontal stabilizer in the up and down directions. It makes sure that the autotrim mode of the SRMs operates correctly.
 B.  References
 (1)  AMM 22-10-00/501, Autopilot/Flight Director System
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 22-22-00
 ALL  ú ú 01 Page 501 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (2)  
AMM 22-11-01/201, FCC Software Installation

 (3)  
AMM 24-22-00/201, Manual Control

 (4)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (5)  
AMM 34-21-00/201, Inertial Reference System

 (6)  
AMM 34-61-00/501, Flight Management Computer System

 (7)  
AMM 34-61-02/401, Control Display Unit

 (8)  
AMM 45-10-00/501, Central Maintenance Computer system

 (9)  
FIM 22-CMCS Message Index

 C. Access
 (1)  Location Zone
 221 Control Cabin, LH
 222 Control Cabin, RH

 D. Preconditions
 S 865-234
 (1)  These conditions are necessary for this task:
 (a)  
Electrical Power On (AMM 24-22-00/201).

 (b)  
Central Maintenance Computer (CMC), serviceable (AMM 45-10-00/501).

 (c)  
Control Display Unit (CDU), serviceable (AMM 34-61-02/401).

 (d)  
IRUs must be in the NAV mode (AMM 34-21-00/201).

 (e)  
Hydraulic Pressure Supplied (AMM 29-11-00/201).

 (f)  
Flight Control Computer (FCC), serviceable (AMM 22-11-01/401).

 (g)  
Flight Management Computer (FMC), serviceable (AMM 34-61-00/501).

 E. Prepare for the Operational Test
 S 865-046
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-006

 (2)  
　
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