Telephonics Corporation
R ADAR SYSTEMS D IVISION
TM113806 (3/10) 1-19
Table 1.3.6-1
Air Data System ARINC 429 Data Labels
LABEL DEFINITION UNITS RESOLUTION
TX RATE
(HZ)
NAVIGATION
OVERLAY
TRACKER
MODE
NOTES
203 Baro Altitude Ft 1 Ft 2 No Yes Not required for Navigation Overlay mode or Target Marker
operation.
This is the last source for Baro Altitude. Primary source is
from the Air Data System Label 204.
Required for proper Tracker operation. If not present then
the tracker will set the altitude of 5000 feet. Minor errors in
range (typically less than 0.5 nm) will occur when the
aircraft deviates away from 5000 feet.
204 Baro Altitude Ft 1 Ft 2 No Yes Not required for Navigation Overlay mode or Target Marker
operation.
Primary source for Baro Altitude for the tracker. If the data
is not on the primary data source (ADS) then the tracker will
look for Baro Altitude on FMS bus.
Required for proper Tracker operation. If not present then
the tracker will set the altitude of 5000 feet. Minor errors in
range (typically less than 0.5 nm) will occur when the
aircraft deviates away from 5000 feet.
212 Altitude Rate Ft/Min 16 50 No Yes Not required for Navigation Overlay mode or Target Marker
operation.
This is the last source for Vertical Velocity. Primary source
is from the Air Data System Label 204.
Required for proper Tracker operation. If not present then
the tracker will set the vertical velocity to 0 ft/min. Minor
errors in range (typically less than 0.5 nm) will occur during
aircraft transitions in altitude.
The document reference is online, please check the correspondence between the online documentation and the printed version.
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