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d) the Mode S transponder shall receive from its ACAS an indication that RAs are enabled or inhibited for transmission
in the RI field of downlink formats 0 and 16.
4.3.1 1.2.2 Data transfer from Mode S tra~zspon,dero its ACAS:
a) The Mode S lransponder shall transftr to its ACAS received sensitivity level control commands (4.3.8.4.2.1,l)
transmitted by Mode S stations;
Cliapter 4 Annex 10 - Aeronautical Xeltcommunications
b) lhc Modc S transponder shall transfer to its ACAS received ACAS broadcast messages (4.3.8.4.2.3.3) transmitted
by other ACASs;
c) the Mode S transponder shall transfer to its ACAS received resolution messages (4.3.8.4.2.3.2) transmitted by othcr
ACASs for air-air coordination purposes; and
d) the Mode S transponder shall transfer to its ACAS own aircraft's Mode A identity data for transmission in an
RA broadcast (4.3.8.4.2.3.4.5).
4.3.1 1.3 COMMUNICATION OF ACAS
INFORMATION TO OTHER ACAS
4.3.1 1.3.1 Surveillance reply. The ACAS Mode S transponder shall use the short (DF = 0) or long (DF = 16)
surveillance formats for replies to ACAS surveillance interrogations. The surveillance reply shall include the VS field as
specified in Chapter 3, 3.1.2.8.2, the RI field as specified in Chapter 3, 3.1.2.8.2 and in 4.3.8.4.1.2, and the SL field as
specified in 4.3.8.4.2.5.
4.3.1 1.3.2 Coordination reply. The ACAS Mode S transponder shall transmit a coordination reply upon receipt of a
coordinaljon interrogation from an equipped threat subject to Lhe conditior~so f 4.3.11-3.2.1. The coordination reply shall
use the long air-air surveillance reply format, DF = 16, with the VS field as specified in Chapter 3, 3.1.2.8.2, the RI field
as specified in Chapter 3, 3.1.2.8.2 and in 4.3.8.4.1.2, the SL field as specified in 4.3.8.4.2.5 and the MV field as specified
in 4.3.8.4.2.4. Coordination replies shall be transmitted even if the minimum reply rate limits of the transponder (Chapter
3, 3.1.2.10.3.7.2) are exceeded.
4.3.1 1.3.2.1 The ACAS Modc S transponder shall reply with a coordination reply to a coordination interrogation
received from another ACAS if and only if the transponder is able to deliver the ACAS data content of the interrogation
to its associated ACAS.
4.3.1 1.4 COMMUN~CATO~F OANCA S
INFORMATION TO GROUND STATIONS
4.3.1 1.4.1 RA reports to Mode S ground station.^. During the period of an RA and for 18k1 s following the end of
the RA, the ACAS Mode S transponder shall indicate that it has an RA report by setting the appropriate DR field code
in replies to a Mode S sensor as specified in 4.3.8.4.1.1. The RA report shall include the MI3 field as specified in
4.3.8.4.2.2.1. The RA report shall describe the most recent RA that existed during the preceding 18k1 s period.
Note.- Upon receipt of a reply with DR = 2, 3, 6 or 7, a Mode S ground station may request downlink of the RA report
by setting RR = 19 and either Dl f 7, or DI = 7 and RRS = 0 in a surveillance or Comm-A interrogation to the ACAS
aircrafr. When this interrogation is received, the transponder replies with a Comm-B reply whose MB field contains the
RA report.
4.3.1 1.4.2 Data link cupability report The presence of an ACAS shall be indicated by its Mode S transponder to a
ground station in the Mode S data link capability report.
Note.- This indication causes the transponder to set codes in a data link capability report as specified in 4.3.8.4.2.2.2.
4.3.12 Indications to the flight crew
4.3.1 2.1 CORRECTIVAEN D PREVENTIVE RAS
Recommendation.- Indications to the flight crew should distinguish between preventive and corrective Ms.
Annex 10 - Aeronautical Telecommunications Volume lV
4.3.12.2 ALTITUDCER OSSING US
Recommendation.- IfACAS generates an altitude crossing RA, a spect@c indication should be given to theflight crew
that it is crossing.
4.4 PERFORMANCE OF THE ACAS I1 COLLISION AVOIDANCE LOGIC
Note.- Caution is to be observed when considering potential improvements to the reference ACAS II system described
in Section 4 of the guidance material in AttachmentA since changes may affect more than one aspect of the .ry.rtem
performance. It is essential that alternative designs would not degrade the performances of other designs and that such
compatibility is demonstrated with a high degree of confidence.
4.4.1 Definitions relating to the performance of the collision avoidance logic
Note.- The notation Itl, t2] is used to indicate the interval between tl and t2.
Altitude layer. Each encounter is attributed to one of six altitude layers as follows:
Layer I 2 3 4 5 6
The altitude layer of an encounter is determined by the average altitude of the two aircraft at closest approach.
Note.- For the purposes of defining the perfarmunce of the collision avoidance logic, there is no need to specih the
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