S 864-029

 (7)  
Use the alternate trim switches to move the stabilizer airplane nose up for 5 seconds.

 (a)  
Make sure the stabilizre moves in the airplane nose up direction (stabilizer leading edge down).

 (b)  
Make sure that the UNSCHED STAB TRIM EICAS message is not shown on the EICAS display panel, P2.

 S 864-030
 (8)  
Use the alternate trim switches to move the stabilizer airplane nose down for 5 seconds.

 (a)  
Make sure the stabilizer moves in the airplane nose down direction (stabilizer leading edge up).

 (b)  
Make sure that the UNSCHED STAB TRIM EICAS message is not shown on the EICAS display panel, P2.

 S 864-031
 (9)  
Put the RIGHT STAB TRIM SHUTOFF valve switch on the P10 panel to the CUTOUT position.

 S 864-034

 (10)
 Put the CENTER STAB TRIM SHUTOFF valve switch on the P10 panel to the NORM position.

 S 864-033

 (11)
 Use the alternate trim switches to move the stabilizer airplane nose up.

 (a)  
Make sure the stabilizer moves in the airplane nose up direction (stabilizer leading edge down).

 S 864-032
 (12)
 Use the alternate trim switches to move the stabilizer airplane nose down.

 (a)  
Make sure the stabilizer moves in the airplane nose down direction (stabilizer leading edge up).

 E.
Put the Airplane Back to Its Usual Condition

 S 864-023
 (1)  
Remove the power from the right and center hydraulic systems (Ref 29-11-00).

 (2)
Remove electrical power if it is not necessary (Ref 24-22-00).

 S 864-024
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH ALTERNATE STAB TRIM ú

 27-41-03
 SWITCHES ON THE CONTROL STAND  ú ú 01 Page 405 ú Sep 20/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 STABILIZER TRIM CONTROL MODULE - MAINTENANCE PRACTICES
______________________________________________________
 1.  General_______
 A.  This procedure contains steps to remove and install the stabilizer trim control modules (STCMs) and the solenoid valves on the STCMs.
 B.  The procedures to remove and install the right and left STCMs are the same.
 C.  The procedures to remove and install each of the solenoid valves on the right and left STCMs are the same.
 TASK 27-41-05-022-001
 2.  Remove the Stabilizer Trim Control Modules (STCMs) and the Solenoid Valves__________________________________________________________________________
 A.  General
 (1)  This task contains two procedures, one to remove the STCM, and one to remove the solenoid valves on the STCM. Because this task contains two procedures, do only the applicable group of steps.
 To start one of these procedures, do the "Prepare for the Removal" group of steps. Then do the group of steps that is necessary to remove the component.
 B.  Equipment
 (1)  
Gage Assembly - B27039-2 (Part of the Elevator
 and Stabilizer Rigging Equipment, B27039-1)

 (2)  
Rig Pins from Set B20003-XX (Ref 20-10-24):

 (a)  
E/ST1 - P/N B20003-21

 (b)  
E/ST2 - P/N B20003-21

 C.  
References

 (1)  
06-42-00/201, Empennage Access Doors and Panels

 (2)  
20-10-24/201, Rig Pins

 (3)  
29-11-00/201, Main (Left, Right, and Center) Hydraulic Systems

 D.  
Access

 (1)  
Location Zones 211/212 Control Cabin 311/312 Area Aft of Pressure Bulkhead to BS 1787.45

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-41-05
 ALL  ú ú 01 Page 201 ú Dec 20/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL

CHECK NUT
CONTROL
ROD
　
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