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If AQ equals 0 in the interrogation, the RI field of the reply shall contain the value 0.
If AQ equals 1 in the interrogation, the R1 field of the reply shall contain the maximum cruising true airspeed capability
of the aircraft as defined in 3.1.2.8.2.2.
In response to a UF = 0 with RL = 1 and DS + 0, the transponder shall reply with a DF = 16 reply in which the MV
field shall contain the contents of the GICB register designated by the DS value. In response to a UF = 0 with RL = 1
and DS = 0, the transponder shall reply with a DF = 16 with an MV field of all zeros. Receipt of a UF = 0 with DS + 0
but RL = 0 shall have no associated ACAS cross-link action, and the transponder shall reply as specified in 3.1.2.8.2.2.
Note.- SSR Mode S transponders transmit acquisition quitters (unsolicited downlink transmissions) to permit
passive acquisition by interrogators with broad antenna beams, where uctive acquisition muy be hindered by all-call
synchronous garble. Exumples of such interrogators are an airborne collision avoidance system and an airport surface
sunJeillance systenz.
3.1.2.8.5.1 Acquisition squitfer format. The format used for acquisition squitter transmissions shall be the all-call
reply, (DF = 11) with I1 = 0.
3.1.2.8.5.2 Acquisition squitter rate. Acquisition squitter transmissions shall be emitted at random intervals hat are
uniformly distributed over the range from 0.8 to 1.2 seconds using a time quantization of no greater than 15 milliseconds
relative to the previous acquisition squitter, with the following exceptions:
Cliapter 3 Annex 10 - Aeronautical Telecommunications
a) the scheduled acquisition squitter shall be delayed if the transponder is in a Wansaction cycle (3.1.2.4.1);
b) the acquisition squitter shall be delayed if an extended squitter is in process;
c) the scheduled acquisition squitter shall be delayed if a mutual suppression interface is active (see Note I below); or
d) acquisition squitters shall only be transmitted on the surface if the transponder is not reporting the surface position
type of Mode S extended squitter.
An acquisition squitter shall not be interrupted by link transacdons or mutual suppression activity after the squitter
transmission has begun.
Note I.- A mutual suppression system may be used to connect onboard equipment operating in the same frequency
band in order to prevent mutual inte$erence. Acquisition squitter action resumes as soon as practical after a mutual
suppression interval.
Note 2.- The sugace report type may be selected automatically by the aircraft or by c o m n d s from a squitter ground
station (3.1.2.8.6.7).
3.1.2.8.5.3 Acquisition squitter antenno selection. Transponders operating with antenna diversity (3.1.2.10.4) shall
transmit acquisition squitters as,follows;
a) when airborne (3.1.2.8.6.71, the transponder shall transmit acquisition squitters alternately from the two antennas;
and
b) when on the surface (3.1.2.8.6.71, the transponder shall transmit acquisition squitters under control of SAS
(3.1.2.6.1.4.1 f)). In the absence of any SAS commands, use of the top antenna only shall be the default.
Note.- Acquisition squitters are not emitted on the sulface if the transponder is reporting the sudace type of extended
sqrritter (3.1.2. S. 6.4.3).
3.1.2.8.6 EXTENDEDSQ UITTER, DOWNLJNK FORMAT 17
1 6 9 33 89
Note.- SSR Mode S transponders transmit extended squitters to support the broadcast of aircraft-derived position for
surveillance purposes. The broadcast of this type of informtion is a fonn of automtic dependent surveillance (ADS)
known as ADS-broadcast (ADS-B).
3.1.2.8.6.1 Extended squitter formt. The format used for the extended squitter shall be a 112-bit downlink format
(DF = 17) containing the following fields:
Field Reference
DF downlink format 3.1.2.3.2.1.2
CA capability 3.1.2.5.2.2.1
AA address, announced 3.1.2.5.2.2.2
ME message, extended squitter 3.1.2.8.6.2
PI parity/interrogator identifier 3.1.2.3.2.1.4
The PI field shall be encoded with II equal to 0.
3.1.2.8.6.2 ME: Message, extended squitter: This 56-bit (33-88) downlink field in DF = 17 shall be used to transmit
broadcast messages. The formats and update rates for each register used to support extended squitter (BDS 0,5; BDS 0,6;
BDS 0,7: BDS 0,8; BDS 0,9; BDS 0,A) shall be as defined in Annex 10, Volume III, Part I, Appendix 1 to Chapter 5.
Annex 10 - Aeronautical Telecommunications Volume ZV
Note.- Guidance material on transponder register formats and data sources is included in the Manual on Mode S
Specific Services (Doc 9688).
3.1.2.8.6.3 Extended squitter types
3.1.2.8.6.3.1 Airborne position squitter: The airborne position extended squitter type shall use format DF = 17 with
the contents of GICB register 05 {HEX) inserted in the ME field.
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