S 865-025

 (2)  
Open the 7F10 EIU C circuit breaker on the P7 panel.

 S 865-067

 (3)  
Open the 7F15 EIU R circuit breaker on the P7 panel.

 S 865-026

 (4)  
Close the 414L8 CMC LEFT circuit breaker on the P414 panel.

 S 865-027

 (5)  
Open the 415L39 CMC RIGHT circuit breaker on the P415 panel.

 S 735-028

 (6)  
Do a test of the analog fault discrete and of the CMC interface from the left EIU.

 (a)
Put the left IRU into the Ground Test mode from a CDU.

 1)  Make sure that IRS LEFT comes into view on the main EICAS display for a short time.

 (b)
Put the center IRU into the Ground Test mode from a CDU.

 1)  Make sure that IRS CENTER comes into view on the main EICAS display for a short time.

 (c)
Put the right IRU into the Ground Test mode from a CDU.

 1)  Make sure that IRS RIGHT comes into view on the main EICAS display for a short time.
 S 865-029
 (7)  
Close the 7F10 EIU C circuit breaker on the P7 panel.

 (8)  
Set the EIU SEL switch on the P2-4 panel to the C position.

 (9)  
Open the 7F9 EIU L circuit breaker on the P7 panel.

 S 865-204
 S 865-030
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 34-21-00
 ALL  ú ú 05A Page 514 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 735-068
 (10) Do a test of the analog fault discrete and of the CMC interface from the center EIU.
 (a)
Put the left IRU into the Ground Test mode from a CDU.

 1)  Make sure that IRS LEFT comes into view on the main EICAS display for a short time.

 (b)
Put the center IRU into the Ground Test mode from a CDU.

 1)  Make sure that IRS CENTER comes into view on the main EICAS display for a short time.

 (c)
Put the right IRU into the Ground Test mode from a CDU.

 1)  Make sure that IRS RIGHT comes into view on the main EICAS display for a short time.
 S 865-031
 (11)
 Close the 7F15 EIU R circuit breaker on the P7 panel.

 S 865-032

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

 S 865-033

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

 S 735-034

 (14)
 Do a test of the analog fault discrete and of the CMC interface from the right EIU.

 (a)
Put the left IRU into the Ground Test mode from a CDU.

 1)  Make sure that IRS LEFT comes into view on the main EICAS display for a short time.

 (b)
Put the center IRU into the Ground Test mode from a CDU.

 1)  Make sure that IRS CENTER comes into view on the main EICAS display for a short time.

 (c)
Put the right IRU into the Ground Test mode from a CDU.

 1)  Make sure that IRS RIGHT comes into view on the main EICAS display for a short time.
 G.  Right CMC Interface Test
 S 865-035
 (1)  
Close the 415L39 CMC RIGHT circuit breaker on the P415 panel.

 (2)  
Close the 180D16 CMC-SW circuit breaker on the P180 panel.

 (3)  
Open the 414L8 CMC LEFT circuit breaker on the P414 panel.

 S 865-135

 (4)  
Put the left IRU into the Ground Test mode from a CDU.

 S 865-036
 S 865-037
 (a)  Make sure that IRS LEFT comes into view on the main EICAS display for a short time.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 34-21-00
 ALL  ú ú 10A Page 515 ú Feb 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 865-136
 (5)  Put the center IRU into the Ground Test mode from a CDU.
　
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