S 865-092

 (17)
 Close these circuit breakers on the P11 panel:

 (a)
11A18, YAW DAMPER LEFT

 (b)
11C6, FLT CONT ELEC 1L AC

 (c)
11C8, FLT CONT ELEC 2L AC

 S 865-093
 (18) Open these circuit breakers on the P11 panel:
 (a)
11F34, YAW DAMPER RIGHT

 (b)
11G17, FLT CONT ELEC 1R AC

 (c)
11G27, FLT CONT ELEC 2R AC

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 S 865-094
 (19) Close this circuit breaker on the P11 panel:
 (a) 11C30, LANDING GEAR POS SYS 1
 S 285-095
 (20)
 Make sure that the YAW DAMPER INOP L light on P5 panel is off.

 S 285-096

 (21)
 Stop for a minimum of 2 seconds then make sure that the AIR/GRD faultball on the left yaw damper module is yellow.

 S 285-097

 (22)
 Make sure that the YAW DAMPER maintenance message is shown on the lower EICAS display.

 S 865-098

 (23)
 Open this circuit breaker on the P11 panel and attach a DO-NOT-CLOSE tag:

 (a) 11C30, LANDING GEAR POS SYS 1
 S 285-099
 (24)
 Stop for a minimum of 10 seconds then make sure that the AIR/GRD faultball on the left yaw damper module is black and the YAW DAMPER maintenance message is not shown.

 S 865-100

 (25)
 Close these circuit breakers on the P11 panel:

 (a)
11F34, YAW DAMPER RIGHT

 (b)
11G17, FLT CONT 1R AC

 (c)
11G27, FLT CONT 2R AC

 (d)
11S19, AIR/GND SYS 2

 S 285-101
 (26) Stop for a minimum of 2 seconds then make sure that the AIR/GRD faultball on the left and right yaw damper modules are yellow.
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 S 865-102
 (27) Open this circuit breaker on the P11 panel:
 (a)  11S19, AIR/GND SYS 2
 S 285-103
 (28)
 Stop for a minimum of 10 seconds then make sure that the AIR/GRD faultballs on the left and right yaw damper modules are black.

 S 865-104

 (29)
 Close these circuit breakers on the P11 panel:

 (a)  
11C30, LANDING GEAR POS SYS 1

 (b)  
11S19, AIR/GND SYS 2

 S 865-353
 (30) Put the safety sensitive systems back to their initial conditions (Ref 32-09-02/201).
 J. Hydraulic Interface Test
 S 865-105
 (1)
Remove the power from the left hydraulic system (Ref 29-11-00).

 S 865-106

 (2)  
Stop for a minimum of 6 seconds then continue.

 S 985-107

 (3)  
Put the YAW DMPR test switch on the P61 panel in the L position, then put the switch back to the center.

 S 285-108

 (4)  
Make sure that the rudder position indicator on the lower EICAS display shows no rudder movement.

 S 285-109

 (5)  
Stop for a minimum of 15 seconds then make sure that the YAW DAMPER INOP L light is on.

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MAINTENANCE MANUAL

 (6)  S 285-110Make sure that the left YDM HYD PRESS fault ball shows black and the YD ACT faultball shows yellow.
 (7)  S 985-111Push the left YAW DAMPER switchlight on the overhead panel, P5, twice to re-engage left system.
　
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