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A
747-400 MAINTENANCE MANUAL
G. Power Up Test
S 865-093
(1) Open these circuit breakers:
(a) P7 Overhead Circuit Breaker Panel
1) 7C10 FLT CONT ELEC 2L AC
2) 7C12 FLT CONT ELEC 1L AC
3) 7C14 FLT CONT ELEC 1R AC
4) 7C16 FLT CONT ELEC 2R AC
S 715-094
(2)
Make sure that the INOP annunciators of the upper and the lower yaw dampers on the Overhead Panel (P5) come on.
S 865-095
(3)
Close these circuit breakers:
(a) P7 Overhead Circuit Breaker Panel
1) 7C10 FLT CONT ELEC 2L AC
2) 7C12 FLT CONT ELEC 1L AC
3) 7C14 FLT CONT ELEC 1R AC
4) 7C16 FLT CONT ELEC 2R AC
S 715-096
(4) Make sure that the INOP annunciators of the upper and the lower yaw dampers (P5) go off.
NOTE: The INOP annunciator can come on and then go off
____ two or three times because of the automatic inop interface test. The INOP annunciator will go off permanently in less than 15 seconds.
S 745-074
(5) Do a check on the existing faults of the yaw damper:
(a)
Push the LSK adjacent to <EXISTING FAULTS from the CMC MENU page 2/2 on the CDU.
(b)
Make sure that <22 YAW DAMPER does not show on the EXISTING FAULTS MENU page on the CDU.
NOTE: If no failure occurs, <22 YAW DAMPER does not show on
____ the EXISTING FAULTS MENU page.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
H. Power Supply Interface Test
S 865-227
(1)
Open the 7C14 FLT CONT ELEC 1R AC and the 7C16 FLT CONT ELEC 2R AC circuit breakers on the P7 Overhead Circuit Breaker Panel.
S 715-097
(2)
Make sure that the INOP annunciator of the lower yaw damper on the Overhead Panel (P5) comes on.
S 865-098
(3)
Close the 7C16 FLT CONT ELEC 2R AC circuit breaker on the P7 Overhead Circuit Breaker Panel and stop for 15 seconds.
S 715-099
(4)
Make sure that the INOP annunciator of the lower yaw damper stays on.
S 865-100
(5)
Open the 7C16 FLT CONT ELEC 2R AC circuit breaker on the P7 Overhead Circuit Breaker Panel.
S 865-101
(6)
Close the 7C14 FLT CONT ELEC 1R AC circuit breaker on the P7 Overhead Circuit Breaker Panel and stop for 15 seconds.
S 715-102
(7)
Make sure that the INOP annunciator of the lower yaw damper goes off.
S 865-103
(8)
Close the 7C16 FLT CONT ELEC 2R AC circuit breaker on the P7 Overhead Circuit Breaker Panel.
S 865-104
(9)
Open the 7C10 FLT CONT ELEC 2L AC and the 7C12 FLT CONT ELEC 1L AC circuit breakers on the P7 Overhead Circuit Breaker Panel.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 715-105
(10)
Make sure that the INOP annunciator of the upper yaw damper on the Overhead Panel (P5) comes on.
S 865-134
(11)
Close the 7C10 FLT CONT ELEC 2L AC circuit breaker on the P7 Overhead Circuit Breaker Panel and stop for 15 seconds.
S 715-135
(12)
Make sure that the INOP annunciator of the upper yaw damper goes off.
S 865-213
(13)
Open the 7C10 FLT CONT ELEC 2L AC circuit breaker on the P7 Overhead Circuit Breaker Panel.
S 715-137
(14)
Make sure that the INOP annunciator of the upper yaw damper comes on.
S 865-214
(15)
Close the 7C12 FLT CONT ELEC 1L AC circuit breaker on the P7 Overhead Circuit Breaker Panel and stop for 15 seconds.
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