Telephonics Corporation
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1-10
TM113806 (3/10)
Table 1.3.4-1
AHRS ARINC 429 Data Labels
LABEL
DEFINITION
UNITS
RESOLUTION
UPDATE
RATE (HZ)
POSITIVE
SENSE
NAVIGATION
OVERLAY
TRACKER
MODE
NOTES
132 True
Heading
Deg
.0055
50
CW from
North
No
Yes
Secondary source for true heading for the
Tracker. If the data is not on the primary
data source (FMS) then the tracker will look
for true heading on AHRS bus.
Required for proper Tracker operation. If
not present then the tracker will be non-
operational and “AMS Data Fail” will be
displayed.
The Navigation Overlay or Target Marker
does not use this source for true heading.
175 Ground
Speed
Kt
.125
50
No
No Not
Used
312
Ground Speed
Kt
.125
50
No
No
Not Used
314 True
Heading
Deg
.0055
50
CW from
North
No Yes
Secondary source for true heading for the
Tracker. If the data is not on the primary
data source (FMS) then the tracker will look
for true heading on AHRS bus.
Required for proper Tracker operation. If
not present then the tracker will be non-
operational and “AMS Data Fail” will be
displayed.
The Navigation Overlay or Target Marker
does not use this source for true heading.
320
Magnetic
Heading
Deg .0055
50 CW from
North
No No
Not
Used
324 Pitch
Angle
Deg
.011
50
Up
Yes
Yes Required for Antenna Stabilization. If not
present then an “AT FAULT” will be
displayed.
Required for proper Tracker operation. If
not present then the tracker will be non-
operational and “NAV Data Fail” will be
displayed.
The document reference is online, please check the correspondence between the online documentation and the printed version.