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Description / Abstract:
This document considers functional requirements consisting of:
airborne surveillance and separation assurance processing (ASSAP),
and cockpit display of traffic information (CDTI) as described in
the Aircraft Surveillance Applications (ASA) Minimum Aviation
System Performance Standards (MASPS), RTCA Document DO 289, and in
the Safety, Performance and Interoperability Requirements documents
for the applications approved by RTCA SC-186 and EUROCAE WG-51:
ATSA-AIRB (DO-319/EUROCAE DOCUMENT ED-164), ATSA-VSA
(DO-314/ED-160), ATSA-ITP (DO-312/ED-159) ATSA-SURF
(DO-322/ED-165), TSAA (DO-348/ED-232), and CAVS (DO-354/ED-233).
Operational performance standards for functions or components that
exceed the stated minimum requirements are identified as optional
features.
DO-317B incorporates the following "prime" differences from
DO-317A:
Traffic Situation Awareness with Alerts (TSAA): Traffic
Situation Awareness with Alerts (TSAA) is an application that is
intended to reduce the number of mid-air collisions and near
mid-air collisions involving general aviation aircraft. TSAA
provides voice annunciations to flight crews to draw attention to
Target Aircraft and also adds visual cues to the underlying basic
traffic situation awareness. The TSAA application uses ADS-B
information, and where available Automatic Dependent
Surveillance-Rebroadcast (ADS-R) and Traffic Information
Service-Broadcast (TIS-B) information to provide the flight crew
with indications of nearby aircraft in support of their
see-and-avoid responsibility.
CDTI Assisted Visual Separation (CAVS): Similar to VSA, the CDTI
is used to assist the flight crew in acquiring and maintaining
visual contact with a preceding aircraft (designated traffic) while
performing a visual separation on approach procedure in Visual
Meteorological Conditions (VMC). The fundamental difference between
VSA and CAVS is that the flight crew is authorized to use the
information provided by the CDTI for the preceding aircraft, after
visual acquisition and cross correlation on the CDTI, as a
substitute for out the window information while performing the CAVS
procedure. Therefore, once the preceding aircraft has been acquired
by correlating the traffic on the CDTI with a visual acquisition of
the traffic out-the-window, the CAVS procedure can continue through
the use of the Traffic Display when the traffic information
out-the-window is no longer available (for example, lost in lights
during approach at night). CAVS can be used for parallel runway
operations; however it cannot be used for designated traffic closer
than the Caution "CAVS Minimum Range" Alert threshold