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Flight Management System (FMS) for the Agusta AW139/AB139 Helicopter
The FMS uses the highest priority GPS for predictive RAIM. The priority
order for FMS 1 is GPS 1, GPS 3, GPS 2. The priority order for FMS 2
is GPS 2, GPS 3, GPS 1. The priority order for FMS 3 is GPS 3, GPS 1,
GPS 2. When only a single GPS is available, both FMSs use the single
GPS for predictive RAIM.
The ETA on the PREDICTIVE RAIM page is updated when the ETA
from the active flight plan changes by more than 10 minutes.
The message PREDICTIVE RAIM UNAVAILABLE is displayed on the
PREDICTIVE RAIM page when the GPS fails or the interface between
the FMS and GPS does not work properly.
Predictive RAIM is calculated using GPS almanac information. The
almanac within the GPS is automatically updated when the GPS is on
and tracking satellites. The almanac within the GPS is set invalid when
the almanac is older than 3.5 days. When the almanac is older than
3.5 days, the message ALMANAC EXPIRED is displayed on the
PREDICTIVE RAIM page. The almanac takes approximately
12--25 minutes to update once the GPS is tracking satellites. RAIM
predictions are not possible with an expired almanac.
The DESTINATION RAIM 1/2 page, shown in Figure 6--64, is displayed
by pushing the DEST prompt on the PREDICTIVE RAIM page.
00721.04
Figure 6- -64
DESTINATION RAIM 1/2
A28- - 1146- - 181
Navigation
REV 3 Mar 2009
6-79
Honeywell International Inc. Do not copy without express permission of Honeywell.
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