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Coding
for SLC based on altitude band 2-7
for SLC from pilot input 0,1,2
for SLC from Mode S ground stations 0,2-6
4.3.4.3.2 Altitude-band SLC command. Where ACAS selects an SLC commar~db ased UII al~itudc,l ~ys~eiessihsa ll
be applied to the nominal altitude thresholds at which SLC command value changes are required as follows: for a
climbing ACAS aircraft the SLC command shall be increased at the appropriate altitude threshold plus the hysteresis
value; for a descending ACAS aircraft the SLC command shall be decreased at the appropriate altitude threshold minus
the hysteresis value.
4.3.4.3.3 Pilot SLC command. For the SLC command set by the pilot the value 0 shall indicate the selection of the
"automatic" mode for which the sensitivity level selection shall be based on the other commands.
Table 4-2
Sensitivity level 2 3 4 5 6 7
Nominal warning time no RAs 15s 20s 25 s 30s 35s
Annex 10 - Aeronautical TeIecommunications Volume ZV
4.3.4.3.4 Mode S ground station SLC command. For SLC commands transmitted via Mode S ground stations
(4.3.3.4.2.1.1), the value 0 shall indicate that the station concerned is not issuing an SLC command and that sensitivity
level selection shall be based on the other commands, including non-0 commands from other Mode S ground stations.
ACAS shall not process an uplinked SLC value of I .
4.3.4.3.4.1 ATS selection of SLC command code. ATS authorities shall ensure that procedures are in place to inform
pilots of any ATS selected SLC command code other than 0 (4.3.4.3.1).
4.3.4.3.5 S~lecliorr~ul e. Own ACAS sellsilivity level shall be set to the smallest non-0 SLC command received from
any of the sources lislcd in 4.3.4.3.
4.3.4.4 Selection of parameter valrnes for RA generation. When the sensitivity level of own ACAS is 3 or greater, the
parameter values used for RA generation that depend on sensitivity level shall be based on the greater of the sensitivity
level of own ACAS, So, and the sensitivity level of the intruder's ACAS, SF
4.3.4.5 Selection of parameter values for TA generation. The parameter values used for TA generation that depend
on sensitivity level shall bc selected on the same basis as those for RAs (4.3.4.4) except when an SLC command with a
value of 2 ("TA only" mode) has been received from either the pilot or a Mode S ground station. In this case, the parameter
values for TA generation shall retain the values they would have had in the absence of the SLC command from the pilot
or Mode S ground station.
4.3.5 Resdution advisories (RAs)
4 3.5.1 RA generation. For all threats, ACAS shall generate an R.4 except where it is not possible to select an l2.4
that can be predicted to provide adequate separation either because of uncertainty in the diagnosis of the intruder's flight
path or because there is a high risk chat a manoeuvre by the threat will negare the RA.
4.3.5.1.1 RA cancellation. Once an RA has been generated against a threat or threats it shall be maintained or
modified until tests that are less stringent than those for threat detection indicate on two consecutive cycles that the RA
may be cancelled, at which time it shall bc cancelled.
4.3.5.2 RA selection. ACAS shall generate the RA that is predicted to provide adequate separation from all threats
and that has the least effect on the current flight path of the ACAS aircraft consistent with the other provisions in this
chapter.
4.3.5.3 RA effectiveness. The RA shall not recommend or continue to recommend a manoeuvre or manoeuvre
restriction that, considering the range of probnblc thrcat trajectories, is more likely to reduce separaliun ~ l l iullc~~ east:i l,
subject to the provisions in 4.3.5.5.1.1 and 4.3.5.6.
Note.- See also 4.3.5.8.
4.3.5.4 Aircrafr capubility. The RA generated by ACAS shall be consistent: with the performance capability of the
aircraft.
4.3.5.4.1 Proximity to the ground. Descend RAs shall not be generated or maintained when own aircraft is below
300 rn (1 000 fi) AGL.
4,3.5.4.2 ACAS shall not operale in sensitivity levels 5.1 when own aircraft is below 300 m (1 000 ft) AGL.
4.3.5.5 Reversals of sense. ACAS shall not reverse the sense of an RA from one cycle to the next, except as
permitted in 4.3.5.5.1 to ensure coordination or when the predicted scpwalion at closest approach for the existing sense
is inadequate.
4.3.5.5.1 Srnsr rrvrrsals agoinst equipped threats. If an KAC received from an equipped threar is incompatible with
the current RA sense, ACAS shall modify the RA sense to conform with the received RAC if own aircraft address is higher
in value than thal of the threat.
Chapter 4 Annex 10 - Aeronautical Telecommrcnica~ions
Note.- 4.3.6.1.3 requires that the own ACAS RAC for the threat is also reversed.
　
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