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Flight Management System (FMS) for the Agusta AW139/AB139 Helicopter
Degraded (DGR) -- DGR is an alerting annunciator. This
D
annunciator is displayed or lit when the FMS cannot guarantee the
position accuracy for the present phase of flight due to sensor
availability. The approved sensors for the flight phases are listed in
Table 3--2.
Approved Sensors for Flight Phase
Flight Phase
Departure or
Terminal
En route
Oceanic
VOR/DME or VOR
Approach
GPS Approach
NDB Approach
The DGR annunciator is displayed on the horizontal situation
indicator (HSI) or primary flight display (PFD) page when both of the
following conditions are valid:
— The sensors being used for navigation are not approved for the
current phase of flight.
— The FMS is the selected aircraft navigation source on EDS.
System Components
3-12
Honeywell International Inc. Do not copy without express permission of Honeywell.
Table 3- -2
Approved Sensors
(Navigation Mode)
GPS
DME/DME
X
X
X
X
X
X
X
X
X
X
X
VOR/DME
X
X
X
X
A28- - 1146- - 181
REV 3 Mar 2009
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