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Self Test A functional test that determines equipment
status.Self test differs from BITE
performance monitoring because it is
initiated by the crew and is not performed
continually or automatically.
Surveillance The volume of airspace surrounding
Volume your aircraft that TCAS scans for intruding
traffic.The TCAS system scans
approximately 40 NM in front of and
9,000 feet above and below the aircraft.
The volume will automatically begin to
decrease when f lying into a high density
area and may be reduced to approximately
15 NM in front of the aircraft.
TA Traffic Advisory.An audio and visual
indication that another aircraft is potential
threat.ATA may become a
Resolution Advisory within 15 seconds.
TA/VSI Traffic Advisory/Vertical Speed
Indicator.A flight instrument that gives
standard VSI indication,plan position of
local traffic,plus RA climb and descent
requirements.
Threat An aircraft that has satisfied TCAS threat
detection logic and thus requiring a
Resolution Advisory.
80
ACS-5059 • Rev 5 - 02/2000
Collision Avoidance System User’s Manu a l
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
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TCASII/ACASII Collision Avoidance System User’s Manual(16)
