(10)
Make sure that the HYD PRESS faultball on the left Yaw Damper Module shows black.
S 865-115
(11)
Remove the power from center hydraulic system (Ref 29-11-00).
S 285-345
(12)
Stop for a minimum of 6 seconds then continue.
S 985-117
(13)
Put the YAW DMPR test switch on the P61 panel in the R position, then put it back to the center.
S 285-118
(14)
Make sure that the rudder position indicator on the lower EICAS display shows no rudder movement.
S 285-119
(15)
Stop for a minimum of 15 seconds then make sure that the YAW DAMPER INOP R light is on.
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A
757 MAINTENANCE MANUAL
S 285-120
(16)
Make sure that the Right YDM HYD PRESS faultball shows black and the YD ACT faultball shows yellow.
S 985-121
(17)
Push the right YAW DAMPER switchlight on the overhead panel, P5, twice to re-engage right system.
S 865-122
(18)
Pressurize the center hydraulic system (Ref 29-11-00).
S 285-123
(19)
Make sure that the YAW DAMPER INOP R light is off.
S 285-124
(20)
Make sure that the HYD PRESS faultball on the right Yaw Damper Module shows black.
K. Air Data Computer Interface Test
S 985-125
(1)
Push and hold the TEST button on the front of the left Digital Air Data Computer (DADC).
S 285-126
(2)
Make sure that the DADC faultballs on the left and right Yaw Damper Modules are yellow.
S 285-127
(3)
Make sure that the YAW DAMPER INOP L and R lights are off.
S 285-128
(4)
Release the test button on the DADC and make sure that the DADC faultballs on the Yaw Damper Modules show black.
(5)
Push and hold the TEST button on the front of the right DADC.
S 985-129
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
S 285-130
(6)
Make sure that the DADC faultballs on the left and right Yaw Damper Modules are yellow.
S 285-131
(7)
Make sure that the YAW DAMPER INOP L and R lights are off.
S 285-132
(8)
Release the test button on the DADC and make sure the Yaw Damper Module DADC faultballs show black.
L. Inertial Reference Unit (IRU) Interface Test
S 985-383
(1) Push for 1 second then release the TEST button on front of left IRU.
NOTE: When you push the TEST button on the IRU, the IRU starts a 10
____ second self-test. The yaw damper response to this test is to set the IRU faultball to yellow.
S 285-134
(2)
Make sure that the IRU faultballs on the left and right yaw damper modules are yellow.
S 265-346
(3)
Stop for a minimum of 10 seconds then make sure that the IRU faultball on the left and right yaw damper modules are black.
(4)
Push for 1 second and release the TEST button on front of right IRU.
S 285-136
(5)
Make sure that the IRU faultballs on the left and right yaw damper modules are yellow.
S 985-135
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