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switch to the normal velocity coding shall be made if both the east-west AND north-south velocities drop below 1 000 kt.
2.3.5.2 SUBTYPES 3 AND 4
Subtypes 3 and 4 of the airborne velocity format shall be used when the transmitting aircraft's velocity over ground is not known.
These subtypes substitute airspeed and heading for the velocity over ground. Subtype 3 shall be used at subsonic velocities, while
subtype 4 shall be used when the velocity exceeds 1 022 kt.
This message shall not bc broadcast if the only valid data are the intent change flag and the Im capability flag (2.3.5.3, 2.3.5.4).
After initialization, broadcasl shall be suppressed by loading register 0916 with all zeros and then discontinuing the updating of the
register until data input is available again.
The supersonic version of the velocity coding shall be used if thc airspeed exceeds 1 022 kt. A swikh to the normal velocity
coding shall be made if the airspeed drops below 1 000 kt.
2.3.5.3 INTENT CHANGE FLA G IN AIRBORNE VELOCITY MESSAGES
An intent change event shall be triggered 4 seconds after the detection of new information being inserted in registers 4,O to 4,2.
The code shall remain set for 18 * I second following an intent change.
28/11/02
No. 77
Annex 10 - Aeronautical Xe~ecommunicatwns
Intent change flag coding:
0 = no change in intent
1 = intent change
Note 1.- Register 4jI6i s not included since it contains dynamic data which will be ~nntinuouslyc hanging.
Note 2.- A fonr-second delay is required to provide for settling time for intent data derived from manually set devices.
2.3.5.4 IFR CAPABILITY FIAG (IFR) W AIRBORNE VELOCITY MESSAGES
The IFR capability flag shall be a I-bit (bit 10) subfield in the subtypes 1, 2, 3 and 4 airborne velocity messages. LFR = 1 shall
signify that the transmitting aircraft has a capability for applications requiring ADS-B equipage class A1 or above. Otherwise, IFR
shall be set to 0.
2.3.5.5 MAGNETIC HEADING IN AIRBORNE VELOCITY MESSAGES
2.3.5.5.1 Magnetic heading status
This 1-bit field shall define the availability of the magnetic heading value. Coding for this field shall be: 0 = not available and
1 = available.
2.3.5.6 MAGNETIC HEADING VALUE
This 10-bit field shall contain the aircraf~ magnetic heading (in degrees clockwise from magnetic north) when velocily over ground
is not available. The magnetic heading shall be encoded as an unsigned angular weigh~cd binary numeral with an MSB of 180
degrees and an LSB of 36011 024 degrees, with zero indicating magnetic north. The data in the field shall be rounded to the nearest
multiple of 36011 024 degrees.
2.3.5.7 D~FFERENFCREOM BAR0 ALTITUDE IN AIRBORNE VELOCITY MESSAGES
This 8-bit field shall contain the signed difference bc~ween barometric and GNSS altitude. (Coding for this field shall be as
indicated in Tables 2-9a and 2-9b.)
The difference between baro altitude and GNSS height above ellipsoid (HAE) shall be used if available. If GNSS HAE is not
available, GNSS altitude (MSL) shall be used when airborne position is being reported using format type codes 1 I through 18.
If airborne position is being reported using format type code 9 or 10, only GNSS (BAE) shall be used. For format type code 9 or
10, if GNSS (HAE) is not available, the field shall be coded with all zeros. Thc basis for the baro altitude difference (eilher GNSS
(HAE) or GNSS altitude MSL) shall be used consistently for the reported difference.
2.3.6 STATUSR EGISTER FORMAT
The status register shall be formatted as specified in the definition of register number 0716 and in the following paragraphs
2.3.6.1 PURPOSE
Unlike the other extended squitter registers, lhe contents of this register shall not be broadcast. The purposc of this register shall
be to serve as an interface between the transponder function and the general Formatterlrnanager fiinction (GFM, 2.5). The two fields
defined for this format shall be the transmission rate subfield and the altitude type sublield.
28111102
No. 77
Annex 10 - Aeronautical Telecommunications Volume ZII
2.3.6~2 TRANSMI~SIROATNE sueFIELD (TRS)
This field is only used for a transponder implementation of extended squitter.
The TRS shall be used to notify the transponder of the aircraft motion status while on the surfacc. If the aircraft is moving, the
surface position squitter shall be broadcast at a rate of twice per second, and identity squi~tcrsa t a rate of once per 5 seconds. If
the aircraft is stationary, the surface position squittet shall be broadcast at a rate of once per 5 seconds and the identity squitter at
a rate of once per 10 seconds.
The algorithm specified in the definition of register number 0716 shall be used by the GFM (2.5) to determine motion status and
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