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A
757
MAINTENANCE MANUAL
(b)
Make sure that the rudder position indicator on the lower EICAS display (AMM 31-41-00/501) shows this sequence of rudder movement in less than 10 seconds: 1) The rudder moves approximately 3 degrees trailing edge
right 2) The rudder moves approximately 3 degrees trailing edge left 3) The rudder goes back to the center.
(c)
Make sure that the YAW DAMPER R INOP light goes off in less than 15 seconds.
S 284-026
(12)
AIRPLANES WITH YDM -101 THRU -121; Make sure that all faultballs on the front of the two yaw damper modules show black.
S 984-027
(13)
AIRPLANES WITH YDM -122 THRU -999; Push the DISPLAY button on the left and right yaw damper modules.
S 744-038
(14)
Make sure that the message NO FAULTS is shown on the display of the two modules.
E. Put the Airplane Back to Its Initial Condition
S 864-042
(1)
Push the left or right YAW DAMPER switch/light on the P5 panel, as applicable, to disengage the yaw damper system.
S 864-030
(2)
Remove the pressure from the left and center hydraulic systems (AMM 29-11-00/201).
(3)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
S 864-031
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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757 MAINTENANCE MANUAL
MODAL SUPPRESSION ACCELEROMETER - REMOVAL/INSTALLATION
______________________________________________________
1. General_______
A. Two modal suppression accelerometers are in the ceiling in the area aft of the bulk cargo compartment. They can be accessed through the aft cargo door.
TASK 22-21-05-024-021
2. Remove the 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. Prepare for Removal
S 864-001
(1) Open these circuit breakers on the overhead circuit breaker panel, P11, and attach DO-NOT-CLOSE tags:
(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
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH -122 AND ON ú
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MAINTENANCE MANUAL
MODAL SUPPRESSION ACCELEROMETER
Modal Suppression Accelerometer Installation
Figure 401
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