User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
T
3
CAS/Part No.9005000
Table 1-33: BDS 0,9 Airborne Velocity Subtypes 3 & 4 – Airspeed and Heading (cont.)
Bits
Parameter
Parameter Data
External Source(s)
38-46
Vertical Rate
N/A
Feet per minute
Label 165 Vertical Rate from GPS 1 or 2
(best HIL value) or Label 212 Vertical
Rate from ADC.
Applicable to –XX400 and subsequent:
IRS Label 365 Inertial Vertical Velocity is
the primary source to encode the Vertical
Rate field. Label 212 Vertical Rate is an
alternate data source.
47-48
Reserved
49
Difference Sign
+
-
50-56
Difference from
Geo and Baro
Altitudes
Feet
Label 370 Height Above Ellipsoid (HAE)
from GPS 1 or 2 (best HIL value) or Label
076 Geometric Altitude from GPS 1 or 2
(best HIL value) or Label 203 Baro
Altitude from ADC.
NOTE:
Subtype 3 is used when NS and EW velocities are Not valid and Airspeed is less than
1022 knots.
Subtype 4 is used when NS and EW velocities are Not valid and Airspeed is greater than
1022 knots.
Table 1-34: BDS 1,0 Data Link Capability
Bits
Parameter
Parameter Data
External Source(s)
1-8
BDS 1,0 Code
9
Continuation
Flag
YES
NO
10-15
Reserved
Applicable to –XX400 and subsequent, See Bit 15 definition below:
15
Overlay
Command
Capability
0 = No OCC
1 = Transponder has
OCC
16
Reserved for
ACAS
17-23
Mode S Sub
Network
Version
Number
0-127
Pub. No. 8600200-001, Revision 004
34-45-29
1-128
04 Nov 2014
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