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interrogation that convey RAC information.
Note.- This includes the vertical RAC (VRC), the cancel vertical RAC (CVC), the horizontal RAC (HRC) and the
cancel horizontal RAC (CHC).
4.3.6.1.3.4 Whenever own ACAS reverses its sense against an quipped threat, the resolution message that is sent on
the current and subsequent cycles to that threat shall contain both the newly selected RAC and the cancellation code for
the RAC sent before the reversal.
4.3.6.1.3.5 When a vertical RA is selected, the vertical RAC (VRC) (4.3.8.1.2.3.2.2) that own ACAS includes in a
resolution message to the threat shall be as follows:
a) "do not pass above" when the RA is intended to provide separation above the threat;
b) "do not pass below" when the RA is intended to provide separation below the threat.
4.3.6.1.4 Resolution nzessage processing. Resolution messages shall be processed in the order in which they arc
received and with delay limited to that required to prevent possiblc concurrent access to stored data and delays due to the
processing of previously received resolution messages. Resolution messages that are being delayed shall be temporarily
queued to prevent possible loss of messages. Processing a resolution message shall include decoding the message and
updating the appropriate data structures with the information extracted from the message.
Note.- According to 4.3.6.1.2, resolution message processing must not access arty data whose usage is not protected
by the coordination lock state.
4.3.6.1.4.1 An RAC or an RAC cancellation received from another ACAS shall be rejectcd if the encoded sense bits
indicate the existence of a parity error or if undefined value(<) are detected in the resolution message. An RAC or an
RAC cancellation rcceived without parity errors and without undefined resolution message values shall be considered
valid.
4.3.6.1.4.2 RAC storage. A valid RAC received from another ACAS shall be stored or shall be used to update
the previously stored RAC corresponding to that ACAS. A valid RAC cancellation shall cause thc previously stored
RAC to be deleted. A stored M C that has not been updated for an interval of 6 s shall be deleted.
4.3.6.1.4.3 RAC record update. A valid RAC or RAC cancellation received from another ACAS shall be used to
update the KAC record. If a bit in the RAC record bas not been refreshed for an interval of 6 s by any threat, that bit
shall be set to 0.
4.3.6.2 PROVISIONFSO R ACAS COMMUNICATION WITH GROUND STATIONS
4.3.6.2.1 Air-initiated downlink o f ACAS Ms. When an ACAS RA exists, ACAS shall:
a) transfer to its Mode S transponder an RA report for transmission LO the ground in a Comm-B reply (4.3.1 1.4.1); and
b) transmit periodic RA broadcasts (4.3.7.3.2).
28/11/02 4-12
Chapter 4 Annex 10 - Aeronautical Telecommunications
4.3.6.2.2 Sensitivity level corztrol (SLC) cornrnand. ACAS shall store SLC co~nnlands from Mode S ground stations.
An SIT cnmmai~dr eceived from a Mode S ground station shall remain effective until replaced by an SEC command from
the same ground station as indicaled by the site number contained in the IIS subfield of the interrogation. If an existing
stored command from a Mode S ground station is not refreshed within 4 minutes, or ~f the SLC command received has
the value 15 (4.3.8.4.2.1.1), the stored SLC command for that Mode S ground station shall be set to 0.
4.3.6.3 PROVISIONS FOR DATA TRANSFER BETWEEN ACAS AND ITS MODE S TRANSPONDER
4.3.6.3.1 Data transfer from ACAS to its Mode S transponder:
a) ACAS shall transfer RA information to its Mode S transponder for transmission in an RA report (4.3.8.4.2.2.1) and
in a coordination reply (4.3.8.4.2.4.2);
b) ACAS shall transfer current sensitivity level to its Mode S transponder for transmission in a sensitivity level report
(4.3.8.4.2.5); and
c) ACAS shall transfer capability information to its Mode S transpondcr for transmission in a data link capability
report (4.3.8.4.2.2.2).
4.3.6.3.2 Datu trunsfer from Mode S transponder to its ACAS:
a) ACAS shall receive from its Mode S transpondcr sensitivity level control commands (4.3~8.4.2.1. I) transmitted by
Mode S ground stations;
b) ACAS shall receive from its Mode S transponder ACAS broadcast messages (4.3.8.4.2.3.3) transmitted by other
ACAS; and
C) ACAS shall receive from its Mode S transponder resolution messages (4.3.3.4.2.3.2) transmitted by other ACAS for
air-air coordination purposes.
4.3.7 ACAS protocols
4.3.7.1 SURVEILLANCPREO TOCOLS
4.3.7.1.1 Surveillance of Mode A/C transponders. ACAS shall use the Mode C-only all-call interrogation (Chapter 3,
3.1.2.1.5.1.2) for surveillance of aircraft equipped with Mode A/C transponders.
4.3.7.1.2.1 Detection. ACAS shall monitor 1 090 MHz for Mode S acquisition squitters (DF = 11). ACAS shall detect
　
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