S 715-235

 (4)  
Make sure that the YAW DAMPER UPR 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 UPR 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 UPR 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 UPR indication (amber) stays.

 S 865-237
 (5)  
Close the 7C09 UPR YAW DAMPER circuit breaker on the P7 Overhead Circuit Breaker Panel and stop for 15 seconds.

 S 715-239

 (6)  
Make sure that the INOP annunciator of the upper yaw damper goes off.

 S 715-241

 (7)  
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.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400
MAINTENANCE MANUAL

 (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.

 S 865-243
 (8)  
Open the 7C18 LWR YAW DAMPER circuit breaker on the P7 Overhead Circuit Breaker Panel.

 S 715-245

 (9)  
Make sure that the INOP annunciator of the lower yaw damper on the Overhead Panel (P5) comes on.

 S 715-247

 (10)
 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 865-223
 (11)
 Close the 7C18 LWR YAW DAMPER circuit breaker on the P7 Overhead Circuit Breaker Panel and stop for 15 seconds.

 S 715-249

 (12)
 Make sure that the INOP annunciator of the lower yaw damper goes off.

 S 715-251

 (13)
 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.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400 MAINTENANCE MANUAL
 (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.

 (f)  
Make sure that the YAW DAMPER LWR indication (amber) does not show.

 S 865-253
 (14) Set the Ground-Test-Enable switch on the P461 Pilot's Overhead Maintenance Panel to the NORM position.
 K. Air/Ground System Interface Test
 S 865-212
 WARNING: PREPARE THE SAFETY-SENSITIVE SYSTEMS FOR THE AIR MODE BEFORE
_______ YOU OPEN THE AIR/GROUND CIRCUIT BREAKERS. IN THE AIR MODE, MANY OF THE AIRPLANE SYSTEMS CAN OPERATE AND CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
　
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