S 985-249

 (2)  
Put the YAW DMPR test switch on the P61 panel in the L position, then put the switch back to the center.

 S 285-250

 (3)  
Make sure that the rudder position indicator on the lower EICAS display shows no rudder movement.

 S 865-251

 (4)  
Stop for a minimum of 15 seconds after you do the two steps before.

 S 285-252

 (5)  
Make sure that the YAW DAMPER INOP L light is on.

 S 985-253

 (6)  
Push the DISPLAY button on the left YAW DAMPER module.

 S 285-254

 (7)  
Make sure that this message is not shown on the left YAW DAMPER module fault display:

 (a)  HYD SWITCH
 S 985-255
 (8)  Push the left YAW DAMPER switch/light on the overhead panel, P5, twice to re-engage left system.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 22-21-00
 ALL  ú ú 10 Page 537 ú May 20/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 S 865-256
 (9)
Pressurize the left hydraulic system (Ref 29-11-00).

 S 285-257

 (10)
 Stop for a minimum of 30 seconds then make sure the YAW DAMPER INOP L light is off.

 S 985-258

 (11)
 Push and release the RESET button on the left YAW DAMPER module.

 S 985-259

 (12)
 Push the DISPLAY button on the left YAW DAMPER module.

 S 285-260

 (13)
 Make sure that this message is not shown on the left yaw damper module fault display:

 (a) HYD SWITCH
 S 865-261
 (14)
 Remove pressure from the center hydraulic system (Ref 29-11-00).

 S 985-262

 (15)
 Put the YAW DMPR test switch on the P61 panel in the R position, then put the switch back to the center.

 S 285-263

 (16)
 Make sure that the rudder position indicator on the lower EICAS display shows no rudder movement.

 (17)
 Stop for a minimum of 15 seconds after you do the two steps before.

 (18)
 Make sure that YAW DAMPER INOP R light is on.

 S 755-374
 S 285-264
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 22-21-00
 ALL  ú ú 12 Page 538 ú Dec 20/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 S 985-265
 (19)
 Push the DISPLAY button on the right YAW DAMPER module.

 S 285-266

 (20)
 Make sure that this message is not shown on the right yaw damper module fault display:

 (a) HYD SWITCH
 S 985-267
 (21)
 Push the right YAW DAMPER switch/light twice to re-engage right system.

 S 865-268

 (22)
 Pressurize the center hydraulic system (Ref 29-11-00).

 S 285-269

 (23)
 Stop for a minimum of 30 seconds then make sure that YAW DAMPER INOP R light is off.

 S 985-270

 (24)
 Push the RESET switch on right yaw damper module.

 S 985-271

 (25)
 Push the DISPLAY button on the right YAW DAMPER module.

 S 285-272

 (26)
 Make sure that these fault messages are not shown on the right yaw damper module fault display:

 (a)
HYD SWITCH

 (b)
YD ACT

 K. Air Data Computer Interface Test
 S 845-363
 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.
 (1) Do the deactivation procedure for the spoilers (Ref 27-61-00) or move all persons and equipment away from the spoiler panels.
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