BendixKing KMH 920 System KMH 980 - Manual (Page 41)

KTA 970/KMH 980 Pilot’s Guide
Rev 2 006-18273-0000
33
TCAS I Appendix
Mode S Transponder Transponder that replies to ATC interrogations
giving an ATCRBS identification code, encoded altitude and other data
fields including discrete aircraft address and airspeed capability.
NAR Non-Altitude Reporting traffic.
Non-Threat Intruder An aircraft that has entered the TCAS I surveil-
lance volume at a distance greater than 5 miles or altitude greater than
1200 feet above or below your own aircraft.
Pressure Altitude Indicated altitude when barometric pressure is set to
29.92” Hg. (1013mb). Pressure altitude is used by TCAS I to determine
the relative altitude of traffic.
Proximity Intruder An aircraft that is within 5 miles range and within
1200 feet above or below your own aircraft but does not meet the TCAS
I definition of a threat.
Rad Alt or RALT Radio Altitude is the height above the ground as deter-
mined by a radio altimeter. RALT is used by TCAS I to inhibit TAs close
to the surface. Radio altitude above terrain is absolute. As such, RALT
height is sometimes referred to as absolute altitude in some systems.
RALT systems typically function below 2,500 ft AGL.
Relative Altitude The difference in altitude between two aircraft. TCAS
I calculates relative altitude as the difference between your own aircraft’s
pressure altitude and the encoded pressure altitude of the Intruder.
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.
Sensitivity Level TCAS I has two sensitivity levels (SL). SL A shall be
automatically invoked using the following order of precedence: (1) when
the TCAS I aircraft is below 2,000 feet AGL (if equipped with radio
altimeter) OR (2) when the landing gear is Extended (no radio altimeter
installed). SL B occurs under all other flight conditions. If aircraft is not
equipped with either a radio altimeter or retractable landing gear, TCAS I
shall stay in SL B at all times.
Surveillance Volume The volume of airspace surrounding your aircraft
that TCAS I scans for Intruding traffic. The TCAS I system scans
approximately 20 NM around and 10000 feet above and below the air-
craft. The volume will automatically begin to decrease when flying into a
high density area.
TA Traffic Advisory. An audio and visual indication that another aircraft
is a potential threat.
Threat An aircraft that has satisfied TCAS I threat detection logic and
thus requiring a Traffic Advisory.