S 865-080

 (12)
 Set the EIU SEL switch on the P2-4 panel to the R position.

 S 865-081

 (13)
 Open the 7F10 EIU C circuit breaker on the P7 panel.

 (a)  Make sure that the >IRS DC LEFT message comes into view on the main EICAS display.
 S 865-082
 (14)
 Set the IRS L mode switch on the MSU to the OFF position.

 S 865-083

 (15)
 Open the 6D7 IRS AC LEFT circuit breaker on the P6 panel.

 S 865-084

 (16)
 Close the 6D8 IRS AC CENTER circuit breaker on the P6 panel.

 S 865-085

 (17)
 Set the IRS C mode switch on the MSU to the ATT position.

 (a)  Make sure that the IRS ALIGN MODE C and >IRS DC CENTER messages come into view on the main EICAS display. 1) Make sure that the IRS ALIGN MODE C message goes out of
 view within 30 seconds.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400 MAINTENANCE MANUAL
 S 865-086
 (18)
 Close the 7F10 EIU C circuit breaker on the P7 panel.

 S 865-188

 (19)
 Set the EIU SEL switch on the P2-4 panel to the C position.

 S 865-087

 (20)
 Open the 7F15 EIU R circuit breaker on the P7 panel.

 (a)  Make sure that >IRS DC CENTER comes into view on the main EICAS display.
 S 865-088
 (21)
 Close the 7F9 EIU L circuit breaker on the P7 panel.

 S 865-089

 (22)
 Set the EIU SEL switch on the P2-4 panel to the L position.

 S 865-090

 (23)
 Open the 7F10 EIU C circuit breaker on the P7 panel.

 (a)  Make sure that >IRS DC CENTER comes into view on the main EICAS display.
 S 865-091
 (24)
 Set the IRS C mode switch on the MSU to the OFF position.

 S 865-092

 (25)
 Open the 6D8 IRS AC CENTER circuit breaker on the P6 panel.

 S 865-093

 (26)
 Close the 6D9 IRS AC RIGHT circuit breaker on the P6 panel.

 S 865-094

 (27)
 Set the IRS R mode switch on the MSU to the ATT position.

 (a)  Make sure that the IRS ALIGN MODE R and >IRS DC RIGHT messages come into view on the main EICAS display. 1) Make sure that the IRS ALIGN MODE R message goes out of
 view within 30 seconds.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 34-21-00
 ALL  ú ú 08A Page 505 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 865-095
 (28)
 Close the 7F10 EIU C circuit breaker on the P7 panel.

 S 865-096

 (29)
 Set the EIU SEL switch on the P2-4 panel to the C position.

 S 865-097

 (30)
 Open the 7F9 EIU L circuit breaker on the P7 panel.

 (a)  Make sure that >IRS DC RIGHT comes into view on the main EICAS display.
 S 865-098
 (31)
 Close the 7F15 EIU R circuit breaker on the P7 panel.

 S 865-099

 (32)
 Set the EIU SEL switch on the P2-4 panel to the R position.

 S 865-100

 (33)
 Open the 7F10 EIU C circuit breaker on the P7 panel.

 (a)  Make sure that >IRS DC RIGHT comes into view on the main EICAS display.
 S 865-101
 (34)
 Set the IRS R mode switch on the MSU to the OFF position.

 S 865-102

 (35)
 Open the 6D9 IRS AC RIGHT circuit breaker on the P6 panel.

 S 865-103

 (36)
 Close the 6E7 IRS DC LEFT circuit breaker on the P6 panel.

 S 865-104

 (37)
 Set the IRS L mode switch on the MSU to the ATT position.

 (a)  Make sure that >IRS AC LEFT comes into view on the main EICAS display.

 (38)
 Set the IRS L mode switch on the MSU to the OFF position.
　
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