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seconds if the Mode A identity code is changed to a value other than those listed in 3.1.2.6.10.1.1.1.
Note.- The value of 'TC is given in 3.1.2.10.3.9.
3.1.2.6.10.1.1.3 Terminution of the permanent alert condition. The permanent alert condition shall be terminated
and replaced by a temporary alert condition when the Mode A identity code is set to a value other than 7500, 7600 or
7700.
3.1.2.6.10.1.2 Ground report. The on-the-ground status of the aircraft shall be reportcd in the FS field and the VS
field (3.1.2.8.2.1) and the CA field (3.1.2.8.1.1). If a means for automatically indicating the on-the-ground condition
(e.g. a weight on wheels or strut switch) is available at the transponder data interface, it shall be used as the basis for the
reporting of vertical status. If a means for automatically indicating the on-the-ground condition is not available at
the transponder data interface (3.1.2.10.5.1.3), the FS and VS codcs shall indicate that the aircraft is airborne and the CA
field shall indicate that the aircraft is either airborne or on the ground (CA = 6).
3.1.2.6.10.1.3 Special position identificution (SPI). An equivalent of the SPI pulse shall be transmitted by Mode S
transponders in the FS field and the surveillance status subfield (SSS) when manually activated. This pulse shall be
transmitted for TI seconds after initiation (3.1.1.6.3, 3.1.1.7.13 and 3.1.2.8.6.3.1.1).
Note.- The value of TI is given in 3.1.2.10.3.9.
3.1.2.6.10.2 Capability reporting protocol
Note.- Aircraft capability is reported in special fields as defined in the following paragraphs.
3.1.2.6.10.2.1 Capability report. The 3-bit CA field, contained in the all-call reply, DF equals 11, shall report the
basic capability of the Mode S transponder as described in 3.1.2.5.2.2.1.
3.1.2.6.10.2.2 Dutu link capability report. Thc data link capability report shall provide the interrogator with a
dcscriptinn of the data link capability of the Mode S installation. The report shall be obtained by a ground-initiated
Comm-B reply in response to an interrogation containing RR equals 17 and DI is not equal to 7 or DI equals 7 and RRS
cquals 0 (3.1.2.6.11.2). The definition of this register is described in 5.2.9.2 of Volume IT1 to Annex 10.
3.1.2.6.10.2.2.1 Subfields in MB for duta link cupability report. The subfields within the MB field of all data link
capability reports shall be: (3.1.2.6.11.2.1)
BDS1 A value of 1 shall be inserted in this 4-bit (33-36) subtield as a first part of Conim-B data selector (BDS)
code.
Annex ID - Aeronautical Telecommunications Volume lV
BDS2 A value of 0 shall be inserted in this 4-bit (37-40) subtield as a second part of Comm-B data selector (BDS)
code.
SCS This I-bit (66) squitter capability subfield shall report the capability of the transponder to transmit extended
squitter position reports. It shall be set to 1 if BDS registers 05 and 06 (HEX} have been updated within the
last ten plus or minus one seconds. Otherwise, it shall be set to 0.
Note.- BDS registers 05 and 06 {HEX} are used for the extended squitter airborne and surface position reports,
respectively.
SIC This I-bit (67) surveillance identifier capability subfield shall report the capability of the transponder to
support the surveillance identifier (SI) codes.
3.1.2.6.10.2.2.2 Updating of the data link capability report. Thc transponder shall, at intervals not exceeding four
seconds, compare the current data link capability status with that last reported and shall, if a difference is noted, initiate
a revised data link capability report by Comm-B broadcast (3.1.2.6.11.4) for BDSl = 1 (33-36) and BDS 2 = 0 (37-40).
The transponder shall initiate, generate and transmit the revised capability report even if the aircraft data link capability
is degraded or lost. The transponder shall set the BDS code for the data link capability report.
Note.- The setting of the BDS code by the transponder ensures that a broadcast change of capability report will
contain rhe BDS code for all cases of data link failure (e.g. the loss of the transponder data link inte$ace).
3.1.2.6.10.3 Validation of declared on-the-ground status
Note- For aircraft with an automatic means of determining vertical status, the CAfleld reports whether the aircraft
is airborne or on the ground. ACAS II acquires aircraft using the short or extended sqz~itter;b oth of which contain the CA
field. I f an aircraft reports on-the-ground status, that aircrafi will not be interrogated by ACAS II in order to reduce
unnecessary interrogation activity. If the aircraft is equipped to report extended squitter messages, the function that
formats these messages may have information available to validate that an aircrafi reporting "on-the-ground" is actually
airborne.
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