S 985-138
(7)
Push for 1 second and release the TEST button on front of the center IRU.
S 285-139
(8)
Make sure that the IRU faultballs on the left and right yaw damper modules are yellow.
S 285-140
(9)
Stop for a minimum of 10 seconds then make sure that the IRU faultballs on the left and right yaw damper modules are black.
M. Put the airplane back to its initial condition.
S 865-141
(1) Remove the power from the left and center hydraulic systems (Ref 29-11-00).
S 865-142
(2) Remove electrical power if it is not necessary (AMM 24-22-00/201). ú ú TASK 22-21-00-735-145 ú4. AIRPLANES WITH YDM DASH NUMBERS 285T0013-122 THRU -126;
System Test - Yaw Damper System
_______________________________
GUNú A. General
GUNú
GUNúú NOTE:
____Verify the part number of the Yaw Damper Module before testing. ú
(1) The system test makes sure that these system interfaces operate correctly:
(a)
Modal Suppression Accelerometer
(b)
Yaw Damper servos
(c)
Inertial Reference Units
(d)
Air Data Computers
(e)
EICAS
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
22-21-00
ALL ú ú GUN.1 Page 520 ú Sep 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
B.
C.
D.
E.
757 MAINTENANCE MANUAL
(f)
Air/Ground relays
(g)
Hydraulic pressure switches and sources
(h)
System electrical power sources
(2)
The system test also makes sure that these functions operate correctly:
(a)
Channel fault disengagement
(b)
Disengage relay operation
(c)
Servo loop fault detection
(d)
Monitor operationReferences
(1)
24-22-00/201, Electrical Power - Control
(2)
27-21-00/501, Rudder and Rudder Trim Control System
(3)
27-61-00/201, Spoiler/Speedbrake Control System
(4)
29-11-00/201, Pressurize/Depressurize Main Hydraulic System
(5)
31-41-00/501, Engine Indication and Crew Alerting System
(6)
32-09-02/201, Air/Ground Relays
(7)
33-16-00/501, Master Dim and Test
(8)
34-12-00/501, Air Data Computing System
(9)
34-21-00/501, Inertial Reference SystemAccess
(1) Location Zones 119/120 Main Equipment Center 211/212 Control Cabin
(2) Access Panel 119BL Main Equipment Center
Prepare for Test
S 715-146
(1) Do the Prepare for Test procedures in the Yaw Damper Systems
Operational Test.Power-Up-Test
S 985-147
(1) Push the two YAW DAMPER-ON switch/lights and make sure the ON light on the yaw damper panel comes on.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
22-21-00
ALL ú ú 05 Page 521 ú Mar 20/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
S 845-380
WARNING: DO THE DEACTIVATION PROCEDURE FOR THE SPOILERS OR MOVE ALL
_______ PERSONS AND EQUIPMENT AWAY FROM THE SPOILER PANELS. THE SPOILERS CAN RETRACT QUICKLY AND CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(2)
Do the deactivation procedure for the spoilers (Ref 27-61-00) or move all persons and equipment away from the spoiler panels.
S 865-148
(3)
Open for 1 second and close these circuit breakers on the P11 panel:
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