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the appropriate code shall be set in the TRS subfield. The transponder shall examine the TRS subtield to determine which rate to
use when it is broadcasting surface squitters.
2.3.6.3 ALTITUDE TYPE SUBFIELD (ATS)
This field shall only be used for a transponder implementation of extended squitter.
The transponder shall load the altitude field of the airborne position squitter from the same digital source as used for addressed
replies.
Nore.- This is done to minimize the possibility that the altitude in the squitter is difJerent from the altitude thar would be
obtained by direct interrogation.
If the GFM (2.5) inserts GNSS height (HAE) into the airborne position squitter, it shall instruct the transponder not to insert the
baro altitude into the altitude field. The ATS subfield shall be set to ONE for this purpose.
2.3.7 EVENT-DRIVPERNOT OCOL
The event-driven protocol register shall be as specified in the definition of register numbers OA16 in 2.5.5 and in the ,following
paragraphs.
2.3.7.1 PURPOSE
The event-driven protocol shall be used as a flexible means to support the broadcast of messages beyond those defined for position,
velocity, and identification.
Note.- Thcse typicully will be messages thar are broadcast regulurly for a period of time based on the occurrence of an event.
An example is the broadcust of emergency/priority status every second during a declared aircraft emergency. A second example is
the periodic broadcast of intent information for the duration of the opemtional condition.
2.3.8 EMERGENCY/PRIOSKTA~T~UWS
The emergencylpriorily status squitter shall be formatted as specified in the definition of register number 6lI6 and in the following
paragraphs.
2.3.8.1 TRANSMISSION RATE
This message shall be broadcast once per second for the duration of the emergency.
Message delivery shall bc accomplished using the event-driven protocol (2.3.7). Vie broadcast of this message shall take priority
over [he cvenl-driven protocol broadcast of all olhcr message types, as specified in 2.5.5.3.
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Part I Annex 10 - Aero~lautical Xelecornrnunications
2.3.9 CURRENTmEXT TRAJECTORY CHANGE POINT (TCP/TCP+I)
The currentlnext trajectory change point (TCP) squitter shall be formatted as specified in the definilion of register numbers 62,,
and 63,, and in the following paragraphs.
2.3.9.1 TRANSMISSION RATE
This message shall be broadcast once per 1.7 seconds for the duration of the operation.
2.3.9.2 MESSAGE DEIJVERY
Message delivery shall be accomplished using the event-driven protocol (2.3.7).
2.3.9.3 ThJECTORY pOINT/LEC TYPE
This Cbit (7-10) subfield shall be used to identify the type of TCP for which data are being provided in the message. The TCP
type subfield shall be encoded as follows:
Encoding Meaning
0000 No specific trajectory change potnt description information
000 1 "Straight" (geodesic) course to a "fly by" waypoint
0010 "Straight" (geodesic) course to a "fly over" waypoint
001 1 "Straight" (geodesic) course to a "speed change" waypoint
0100 "Straight" (geodesic) course to a "vertical speed change" waypoint
0101 Arc course to a "fly by" waypoint
01 10 Arc course to a "fly over" waypoint
Olll Arc course to a "speed change" waypoint
1000 Arc course to a "vertical speed change" waypoint
1001 Holding pattern to a holding fix
1010 Course FROM the waypoint, termination point unknown
101 1 Reserved for future use
1 100 Reserved for future use
1101 Reserved for futurc use
1 1 10 Reserved for future use
1111 Reserved for future use
If the trajectory point/leg can be classified in more than one of the categories identified in thc table above, then the typc having the
largest encoded value shall be used.
2.3.9.4 TcP DATA VALID
This I-bit (1 1) subfield shall be used to indicate the validity of the TCP/TCP+l message. A value of ONE shall indicate a valid
message. A value of ZERO shall indicate an invalid message.
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Nn. 77
Annex 10 - Aeronautical Telecommunications Volurne 111
This I-bit (12) subfield shall indicate whether the TCP is specified as position and time (4D), or position only (3D). A value ZERO
shall indicate a 4D TCP. A value ONE shall indicate a 3D TCP. The 3D TCP/TCP+l format shall be used if the distance to the
TCP/TCP+l is greater than 160 NM from the current position of the aircraft transmitting the TCP/TCP+I message.
This 10-bit subfield (13-22) shall be used to provide the binary encoded altitude of the current TCP/TCP+l message. The altitude
subfield shall be encoded as follows:
TCP/TCP + I ALTITUDE
　
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