22-21-05
 YAW DAMPER MODULE  ú ú 01 Page 402 ú Mar 20/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757 MAINTENANCE MANUAL
 (d)  11G27, CSEU 2R AC
 or
 FLT CONT ELEC 2R AC

 S 014-020
 (2)  Open the aft cargo door and remove bulkhead lining in the bulk cargo compartment (AMM 25-50-03/401).
 D. Remove Modal Suppression Accelerometer
 S 864-003
 (1)  
Remove the electrical connector from the modal suppression accelerometer.

 S 984-004

 (2)  
Hold the modal suppression accelerometer in position.

 S 034-005

 (3)  
Remove mounting bolts and washers.

 S 024-006

 (4)  
Remove the modal suppression accelerometer from the area aft of the bulk cargo compartment.

 TASK 22-21-05-424-007
 3.  Install Modal Suppression Accelerometer_______________________________________
 A. References
 (1)  
AMM 24-22-00/201, Electrical Power - Control

 (2)  
AMM 25-50-03/401, Bulkhead Lining

 (3)  
AMM 32-09-02/201, Air/Ground Relays

 (4)  
AMM 34-12-00/501, Air Data Computing System

 (5)  
AMM 34-21-00/501, Inertial Reference System

 B. Access
 (1)  
Location Zones
 165/166 Area Aft of Bulk Cargo Compartment
 211/212 Control Cabin

 (2)  
Access Door
 822 Aft Cargo Compartment Door

 C. Install Modal Suppression Accelerometer
 S 424-022
 (1)  
Put the modal suppression accelerometer into mounting position in the ceiling in the area aft of bulk cargo compartment.

 (2)  
Install the modal suppression accelerometer with washers and bolts.

 S 434-010

 (3)  
Connect the electrical connector to the modal suppression accelerometer.

 S 424-009
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH -122 AND ON ú

 22-21-05
 YAW DAMPER MODULE  ú ú 02 Page 403 ú May 28/01
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A

757 MAINTENANCE MANUAL
 D. Model Suppression Accelermoter Test
 S 864-012
 (1)  Remove DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel:
 (a)  
11C6, CSEU 1L AC
 or
 FLT CONT ELEC 1L AC

 (b)  
11C8, CSEU 2L AC
 or
 FLT CONT ELEC 2L AC

 (c)  
11G17, CSEU 1R AC
 or
 FLT CONT ELEC 1R AC

 (d)  
11G27, CSEU 2R AC
 or
 FLT CONT ELEC 2R AC

 S 864-013
 (2)  
Supply electrical power (AMM 24-22-00/201).

 S 284-014

 (3)  
Make sure that these systems operate:

 (a)  
Air/Ground Relays (AMM 32-09-02/201)

 (b)  
Air Data Computing System (AMM 34-12-00/501)

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

 S 984-015
 (4)
Push the RESET button on the front panel of the yaw damper module.

 S 984-016

 (5)  
Stop for 10 seconds, then push the display button on the front panel of the yaw damper module.

 S 284-017

 (6)  
Make sure that the fault message ACCEL is not shown on the front panel of the yaw damper module.

 E. Put the airplane back to its initial condition.
 S 414-018
 (1)  
Install the bulkhead lining in the bulk cargo compartment and close the aft cargo door (AMM 25-50-03/401).

 (2)
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 864-019
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH -122 AND ON ú

 22-21-05
 YAW DAMPER MODULE  ú ú 02 Page 404 ú May 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
　
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