S 715-139

 (16)
 Make sure that the INOP annunciator of the upper yaw damper goes off.

 S 865-140

 (17)
 Close the 7C10 FLT CONT ELEC 2L AC circuit breaker on the P7 Overhead Circuit Breaker Panel.

 I. 28 Volt DC Power Test
 S 865-107
 (1)  Open these circuit breakers:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7C15 FLT CONT ELEC 1R DC

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747-400 MAINTENANCE MANUAL
 2) 7C17 FLT CONT ELEC 2R DC
 S 715-149
 (2)  
Make sure that the INOP annunciator of the lower yaw damper on the Overhead Panel (P5) comes on.

 S 865-150

 (3)  
Close the 7C15 FLT CONT ELEC 1R DC circuit breaker on the P7 Overhead Circuit Breaker Panel.

 S 715-151

 (4)  
Make sure that the INOP annunciator of the lower yaw damper goes off.

 S 865-152

 (5)  
Open the 7C15 FLT CONT ELEC 1R DC circuit breaker on the P7 Overhead Circuit Breaker Panel.

 S 715-153

 (6)  
Make sure that the INOP annunciator of the lower yaw damper comes on.

 S 865-154

 (7)  
Close the 7C17 FLT CONT ELEC 2R DC circuit breaker on the P7 Overhead Circuit Breaker Panel.

 S 715-155

 (8)  
Make sure that the INOP annunciator of the lower yaw damper goes off.

 S 865-156

 (9)  
Close the 7C15 FLT CONT ELEC 1R DC circuit breaker on the P7 Overhead Circuit Breaker Panel.

 (10)
 Make sure that the INOP annunciator of the lower yaw damper is off.

 S 715-157
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 S 865-106
 (11) Open these circuit breakers:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7C11 FLT CONT ELEC 2L DC
 2) 7C13 FLT CONT ELEC 1L DC

 S 715-000
 (12)
 Make sure that the INOP annunciator of the upper yaw damper on the Overhead Panel (P5) comes on.

 S 865-142

 (13)
 Close the 7C11 FLT CONT ELEC 2L DC circuit breaker on the P7 Overhead Circuit Breaker Panel.

 S 715-215

 (14)
 Make sure that the INOP annunciator of the upper yaw damper goes off.

 S 865-144

 (15)
 Open the 7C11 FLT CONT ELEC 2L DC circuit breaker on the P7 Overhead Circuit Breaker Panel.

 S 715-216

 (16)
 Make sure that the INOP annunciator of the upper yaw damper comes on.

 S 865-148

 (17)
 Close the 7C13 FLT CONT ELEC 1L DC circuit breaker on the P7 Overhead Circuit Breaker Panel.

 S 715-217

 (18)
 Make sure that the INOP annunciator of the upper yaw damper goes off.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 S 865-224
 (19) Close the 7C11 FLT CONT ELEC 2L DC circuit breaker on the P7 Overhead Circuit Breaker Panel.
 J. Yaw Damper Engage Test
 S 865-230
 (1)  
Set the Ground-Test-Enable switch on the P461 Pilot's Overhead Maintenance Panel to the ENABLE position.

 S 865-232

 (2)  
Open the 7C09 UPR YAW DAMPER circuit breaker on the P7 Overhead Circuit Breaker Panel.

 S 215-254

 (3)  
Make sure that the INOP annunciator of the upper yaw damper on the Overhead Panel (P5) comes on.
　
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