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757 MAINTENANCE MANUAL
 (2)  S 865-375Push and hold the test button on the L ADC.
 NOTE:____ When you push the test button on the ADC, the ADC will send a self-test signal and a failure signal to the YDM. The failure signal is stored by the YDM as a fault message that can be viewed when you push the YDM's DISPLAY button.
 (3)  S 985-273Push the DISPLAY button on the left YAW DAMPER module.
 (4)  S 285-274Make sure that this message is shown on the left YAW DAMPER module fault display: (a) L ADC
 (5)  S 985-275Push the DISPLAY button on the right YAW DAMPER module.
 (6)  S 285-276Make sure that this message is shown on the right yaw damper module fault display: (a) L ADC
 (7)  S 985-277Release the test button on the L ADC.
 (8)  S 985-278Push the DISPLAY button on the left YAW DAMPER module.
 (9)  S 285-279Make sure that these fault messages are not shown on the left yaw damper module fault display: (a) L ADC

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757
MAINTENANCE MANUAL

 (b) R ADC
 S 985-280
 (10)
 Push the DISPLAY button on the right YAW DAMPER module.

 S 285-281

 (11)
 Make sure that these fault messages are not shown on the right yaw damper module fault display:

 (a)
L ADC

 (b)
R ADC

 S 985-282
 (12)
 Push and hold the test button on the R ADC.

 S 985-283

 (13)
 Push the DISPLAY button on the left YAW DAMPER module.

 S 285-284

 (14)
 Make sure that this message is shown on the left yaw damper module fault display:

 (a) R ADC
 S 865-376
 (15)
 Push the DISPLAY button on the right YAW DAMPER module.

 S 285-285

 (16)
 Make sure that this message is shown on the right yaw damper module fault display:

 (a) R ADC

 (17)
 Release the test button on the R ADC.

 (18)
 Push the DISPLAY button on the left YAW DAMPER module.

 S 985-286
 S 985-287
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757 MAINTENANCE MANUAL
 S 285-288
 (19) Make sure that these fault messages are not shown on the left yaw damper module fault display:
 (a)  
L ADC

 (b)  
R ADC

 S 985-290
 (20)
 Push the DISPLAY button on the right YAW DAMPER module.

 S 285-289

 (21)
 Make sure that these fault messages are not shown on the right yaw damper module fault display:

 (a)  
L ADC

 (b)  
R ADC

 L. Inertial Reference Unit (IRU) Interface Test
 NOTE: When you push the TEST button on the IRU, the IRU starts a 10
____ second self-test. The yaw damper response to this is to store a fault message that can be shown on the fault YDM's display.
 S 985-291
 (1)  
Push and release the TEST button on front of the left IRU.

 S 985-292

 (2)  
Stop for a minimum of 5 seconds, then push the DISPLAY button on the left YAW DAMPER module.

 S 285-293

 (3)  
Make sure that this message is shown on the left yaw damper module fault display:

 (a)  L IRU

 (4)  
Push the DISPLAY button on the right YAW DAMPER module.

 S 985-294
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