(10)
Make sure that the INOP annunciator of the upper yaw damper goes off.
S 715-240
(11)
Make sure that the YAW DAMPER UPR indication (amber) does not show on the main EICAS display:
(a)
Set the EIU SEL switch on the P2-2 panel to the L position.
(b)
Make sure that the YAW DAMPER UPR indication (amber) does not show.
(c)
Set the EIU SEL switch on the P2-2 panel to the C position.
(d)
Make sure that the YAW DAMPER UPR indication (amber) does not show.
(e)
Set the EIU SEL switch on the P2-2 panel to the R position.
(f)
Make sure that the YAW DAMPER UPR indication (amber) does not show.
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747-400 MAINTENANCE MANUAL
S 865-242
(12)
Open the 7C18 LWR YAW DAMPER circuit breaker on the P7 Overhead Circuit Breaker Panel.
S 715-244
(13)
Make sure that the INOP annunciator of the lower yaw damper on the Overhead Panel (P5) comes on.
S 715-246
(14)
Make sure that a YAW DAMPER LWR indication in amber shows on the main EICAS display:
(a)
Set the EIU SEL switch on the P2-2 panel to the L position.
(b)
Make sure that the YAW DAMPER LWR indication (amber) stays.
(c)
Set the EIU SEL switch on the P2-2 panel to the C position.
(d)
Make sure that the YAW DAMPER LWR indication (amber) stays.
(e)
Set the EIU SEL switch on the P2-2 panel to the R position.
(f)
Make sure that the YAW DAMPER LWR indication (amber) stays.
S 865-225
(15)
Close the 7C18 LWR YAW DAMPER circuit breaker on the P7 Overhead Circuit Breaker Panel and stop for 15 seconds.
S 715-248
(16)
Make sure that the INOP annunciator of the lower yaw damper goes off.
S 715-250
(17)
Make sure that the YAW DAMPER LWR indication (amber) does not show on the main EICAS display.
(a)
Set the EIU SEL switch on the P2-2 panel to the L position.
(b)
Make sure that the YAW DAMPER LWR indication (amber) does not show.
(c)
Set the EIU SEL switch on the P2-2 panel to the C position.
(d)
Make sure that the YAW DAMPER LWR indication (amber) does not show.
(e)
Set the EIU SEL switch on the P2-2 panel to the R position.
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747-400 MAINTENANCE MANUAL
(f) Make sure that the YAW DAMPER LWR indication (amber) does not show.
E. Put the Airplane Back to Its Usual Condition
S 865-252
(1)
Set the Ground-Test-Enable switch on the P461 Pilot's Overhead Maintenance Panel to the NORM position.
S 865-209
(2)
Push and release the engage switches of the upper and the lower yaw dampers (P5) to disengage the yaw damper system.
S 865-226
(3)
Set all the mode selector switches on the IRS control panel (P5) to the OFF position if it is not necessary (Ref 34-21-00/201).
S 865-211
(4)
Remove electrical power if it is not necessary
(Ref 24-22-00/201).
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