(h)  
Connect the hydraulic lines.

 S 432-146
 (2)  
FOR THE LEFT STCM (1); Connect electrical connectors DB189A, DB189B, DB189C, DB189D and DB189E.

 S 432-123

 (3)  
FOR THE RIGHT STCM (1); Connect electrical connectors DB188A, DB188B, DB188C, DB188D and DB188E.

 S 862-014

 (4)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P7, Overhead Circuit Breaker Panel
 1) 7C10, FLT CONT ELEC 2L AC
 2) 7C11, FLT CONT ELEC 2L DC
 3) 7C12, FLT CONT ELEC 1L AC
 4) 7C13, FLT CONT ELEC 1L DC
 5) 7C14, FLT CONT ELEC 1R AC
 6) 7C15, FLT CONT ELEC 1R DC
 7) 7C16, FLT CONT ELEC 2R AC
 8) 7C17, FLT CONT ELEC 2R DC
 9) 7E6, STAB TRIM L CONT
 10) 7E7, STAB TRIM L S/O VLV
 11) 7E8, STAB TRIM L RATE
 12) 7E19, STAB TRIM R CONT

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400
MAINTENANCE MANUAL

 13) 7E20, STAB TRIM R S/O VLV 14) 7E21, STAB TRIM R RATE 15) 7E23, STAB TRIM ALTN CONT
 S 862-015
 (5)  
Remove the DO-NOT-MOVE tags and set the STAB TRIM 2 and 3 switches to AUTO.

 S 712-016

 (6)  
Do this task: "Operational Test - Stabilizer Trim Control Module" (Ref paragraph 4).

 TASK 27-41-04-712-017
 4.  Operational Test - Stabilizer Trim Control Module_________________________________________________
 A. General
 (1)  
This task is an operational test of the replacement STCM. To do this test, it is necessary to have the stabilizer position indicating system and the elevator control system adjusted.

 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.
Prepare for Test

 S 012-018
 (1)  
Open the access door 312A (AMM 06-09-05/201).

 (2)
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).

 S 862-020

 (3)  
Do this task to pressurize the hydraulic systems No. 2 and No. 3: "Supply Hydraulic Power" (AMM 29-11-00/201).

 S 862-021

 (4)  
FOR THE LEFT STCM; Set the STAB TRIM 3 switch to ON and the STAB TRIM 2 switch to CUTOUT.

 S 862-019
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 862-126
 (5)  
FOR THE RIGHT STCM; Set the STAB TRIM 2 switch to ON and the STAB TRIM 3 switch to CUTOUT.

 E.
Do a Test of the STCM

 S 712-022
 (1)  
Use the STAB TRIM switches to do this test of the STCM:

 (a)  
Move the STAB TRIM switches on the captain's control wheel slowly forward until the motor operates.

 (b)  
Move the STAB TRIM switches slowly aft to move the stabilizer to the opposite direction.

 (c)  
Make sure the stabilizer position indicator on the control stand starts, operates and stops smoothly.

 (d)  
Move the STAB TRIM switches quickly from the stop to stop three times.

 (e)  
Make sure that the stabilizer starts smoothly in one second.

 (f)  
Make sure the stabilizer operates and stops smoothly.

 S 712-024
 (2)
　
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