OPERATIONS MANUAL

Navigation Systems
EICAS Messages:
CAUTION MESSAGES (accompanied by caution light and beeper sound)
ILS ANTENNA
{ gear is down
AND more than one glideslope system not switched
from capture antenna to track antenna }
OR
{ flight control computer has captured localizer
AND more than one localizer system not switched
from capture antenna to track antenna }
ADVISORY MESSAGES
>GPS
fault in both GPS sensor units
>GPS ()
fault in one GPS sensor unit (LEFT or RIGHT)
IRS ()
fault in IRU (LEFT, CENTER, or RIGHT)
>IRS AC ()
AC power loss in IRU (LEFT, CENTER, or RIGHT)
>IRS DC ()
DC power loss in IRU (LEFT, CENTER, or RIGHT)
IRS MOTION
aircraft motion detected during position alignment
TRANSPONDER () fault in transponder (L or R)
IRS ALIGN MODE ()
MEMO MESSAGES
IRU (L, C, or R) alignment in progress
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