曝光台 注意防骗
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The performance requirements specified in 4.4.3 and 4.4.4 each apply to three distinct situations in which the following
conditions concerning the intruder's ACAS and trajectory shall apply:
a) where the intruder involved in each encounter is not equipped (4.4.2.1 j) I)), it follows a trajectory identical to that
which it follows when own aircraft is not equipped;
b) where the intruder is ACAS-equipped but follows a trajectory identical to that in the unequipped encounter
(4.4.2.1 j) 2)):
1) it follows the identical trajectory regardless of whether or not there is an RA;
2) the intruder ACAS generates an RA and transmits an RAC that is received immediately after any KA is first
announced to the pilot of own aircraft;
3) the sensc of the RAC generated by the intruder ACAS and transmitted to own aircraft is opposite to the sense
of the first RAC selected and transmitted to the intruder by own aircraft (4.3.6.1.3);
4) the RAC transmitted by the intruder is received by own aircraft; and
5) the requirements apply both when own aircraft has the lower aircraft address and when the intruder aircraft has
the lower aircraft address; and
c) where the intruder is equipped with an ACAS having a collision avoidance logic identical to that of own ACAS
(4.4.2.1 j) 3)):
1) the conditions relating to the performance of own aircraft, ACAS and pilot apply equally to the intruder aircraft,
ACAS and pilot;
2) RACs transmitted by one aircraft are received by the other; and
3) the requirements apply both when own aircraft has the lower aircraft address and whcn the intruder aircraft has
the lower aircraft address.
4.4.2.8 COMPATIi3l1,ITY BETWEEN DIFFERENT COLLISION AVOIDANCE 1,OGIC DESIGNS
Recommendation.- When considel-itzg altewza!ive colliszon avordar~ce logic designs, cert$cariotz arithurities sizollld
verlh that.
Annex 10 - Aeronautical Telecommunications Volume IV
a) the peijfomances of the alternative design are acceptable in encounters involving ACAS units that use existing
designs; and
b) the performances of the existing designs are not degraded by the use of the alternative design.
Note.- To address tlze compatibility between different collision avoidance logic designs, the conditions described
in 4.4.2.7 b) are the most severe that can be anticipated in this respect.
4.4.3 Reduction in the risk of collision
Under the conditions of 4.4.2, the collision avoidance logic shall be such that the expected number of collisions is reduced
to the following proportjons of the number expected in the absence of ACAS:
a) when the intruder is not ACAS equipped 0.18;
b) when the intruder is equipped but does not respond 0.32; and
c) when the intruder is equipped and responds 0.04.
4.4.4 Compatibility with air traffic management (ATM)
4.4.4.1 NUISANCAEL ERT RATE
4.4.4.1.1 Under the conditions of 4.4.2, the collision avoidance logic shall be such that the proportion of RAs which
are a "nuisance" (4.4.4.1.2) shall not exceed:
.06 when own aircraft's vertical rate at the time the RA is first issued is less than 400 ftlmin: or
.08 when own aircraft's vertlcal rate at the time the RA is first issued exceeds 400 ftlmin.
Note.- This requirement is not qualified by the ACAS equipage of the intruder (4.4.2.7) since it has negligible effect
on the occurrence and ,frequency of nuisance RAs.
4.4.4.1.2 An RA shall be considered a "nuisance" for the purposes of 4.4.4.1.1 unless, at some point in the encounter
in the absence of ACAS, the horizontal separation and the vertical separation are simultaneously less than the following
values:
horizontal vertical
separation separation
above FLlOO 2.0 NM 750 ft
below FL100 1.2 NM 750 ft
4.4.4.2 COMPATIBLSEEN SE SEI,ECTION
Under the conditions of 4.4.2, the collision avoidance logic shall be such that the proportion of encounters in which
following the RA results in an altitude separation at closest approach with the opposite sign to that occumng in the
absence of ACAS shall not exceed the following values:
a) when he intruder is not ACAS equipped .08;
b) when the intruder is cquipped but does not respond .O8; and
c) when the intruder is equipped and responds .12.
Chapter 4 Annex I0 - Aerorzautical Telecommunications
4.4.4.3 DEVIATIONCASU SED BY ACAS
4.4.4.3.1 Under the conditions of 4.4.2, the collision avoidance logic shall be such that the number of RAs
resulting in "deviations" (4.4.4.3.2) greater than the values indicated shall not exceed the following proportions of the
total number of RAs:
I when own aircrcrfr's vertical rate
at the time the RA isfirst issued
when the intruder is not ACAS equipped,
for deviations 2300~7
for deviations 260Qft
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