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TM113806 (3/10)
Table 1.3.6-1
Air Data System ARINC 429 Data Labels (Cont)
LABEL
DEFINITION
UNITS
RESOLUTION
TX RATE
(HZ)
NAVIGATION
OVERLAY
TRACKER
MODE
NOTES
220 Baro
Altitude
#2
Ft
1 Ft
2
No
Yes
Not required for Navigation Overlay mode or Target Marker
operation.
Primary source for Baro Altitude for the tracker is label 204.
If the data is not on the primary data source (ADS) then the
tracker will look for Baro Altitude on FMS bus. If not on
the FMS bus, then tracker will look for altitude data from
this label.
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.
251 Baro
Altitude
#3
Ft
1 Ft
2
No
Yes
Not required for Navigation Overlay mode or Target Marker
operation.
Primary source for Baro Altitude for the tracker is label 204.
If the data is not on the primary data source (ADS) then the
tracker will look for Baro Altitude on FMS bus. If not on
the FMS bus, then tracker will look for altitude data from
this label.
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.
252 Baro
Altitude
#4
Ft
1 Ft
2
No
Yes
Not required for Navigation Overlay mode or Target Marker
operation.
Primary source for Baro Altitude for the tracker is label 204.
If the data is not on the primary data source (ADS) then the
tracker will look for Baro Altitude on FMS bus. If not on
the FMS bus, then tracker will look for altitude data from
this label.
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.
The document reference is online, please check the correspondence between the online documentation and the printed version.
