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B
1.3.2 Basic TAS System
The Airborne TAS system is capable of surveillance of aircraft equipped with tran-
sponders (i.e., Mode S and ATCRBS) able to reply to ATCRBS Mode C interroga-
tions in their operational environments. This is a step toward determining
potential collisions and displaying traffic advisory information to the pilot. The TAS
system will interoperate with the U.S. National Standard Air Traffic Control Radar
Beacon System (ATCRBS) and perform reliably out to a range of ten nautical
miles for densities up to 0.08 aircraft per square nautical mile while complying with
all ATCRBS signals-in-space requirements. The TAS equipment will not degrade
either the electromagnetic or the air traffic environment.
When all features are implemented the equipment has the capabilities of the Traf-
fic Advisory System (TAS) defined by TSO-C147 Class A.
The TAS system will provide:
(1) An alert to the pilot using an audible and visual advisory of the proximity of
an intruder aircraft.
(2) The range to ± 0.1 nautical mile, altitude (if reported by surveilled aircraft),
and relative bearing of intruder aircraft with maximum installed accuracy of
± 30° with high reliability. If the intruder aircraft is transponder equipped,
within ten nautical miles, ± 10,000 feet relative altitude, and TAS is not in
interference limiting, it will be reliably detected and reported.
(3)Timely data that does not lag more than 2 seconds behind the actual rela-
tive position as seen by the pilot during normal flight operations.
(4) Probability of displaying false targets will be less than 2%. If they are dis-
played, they will not persist for more than a few seconds.
(5) No increase of traffic on the Secondary Surveillance Radar radio frequen-
cies in a manner that degrades the ATC system.
(6) Display of indications that do not encourage the pilot to maneuver without
first visually acquiring the other aircraft and determining that a maneuver is
required.
1.3.3 System Components
The KMH 880 Multi-Hazard Awareness System shall be composed of the KMH
820 (TAS/EGPWS Processor), a top mounted directional antenna (KA 815), a bot-
tom mounted antenna (a KA-815 directional antenna which shall provide esti-
mated bearing of target aircraft, or an omni-directional monopole antenna which
will not provide bearing information), a top mounted GPS antenna (KA 92), and a
Configuration Module (KCM 805).
Rev 3, August/2002
10609I03.CDL
KMH 880/KTA 870
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