BendixKing KTA 910 System KTA 970 - Manual (Page 14)

Rev 2
KTA 870/KMH 880 Pilot’s Guide
006-18265-0000
TAS Theory of Operation and Symbology
6
TAS OPERATION
TAS monitors the airspace surrounding your aircraft by interrogating the
transponder of the Intruding aircraft. The interrogation reply enables
TAS to compute the following information about the Intruder:
1. Range between your aircraft and the Intruder.
2. Relative bearing to the Intruder.
3. Altitude and vertical speed of the Intruder, if the Intruder is
reporting altitude.
4. Closing rate between the Intruder and your aircraft.
Using this data TAS predicts the time to, and the separation at, the
Intruder’s Closest Point of Approach (CPA). Should TAS predict that
certain safe boundaries may be violated, it will issue a Traffic Advisory
(TA) to alert the crew that closing traffic is nearby.
TAS SENSITIVITY LEVEL
TAS separates the surrounding airspace into two altitude layers. A dif-
ferent sensitivity threshold level for issuing TAs (traffic advisories) is
applied to each altitude layer. Lower altitudes have less sensitive TA
threshold levels to prevent unnecessary advisories in the higher traffic
densities anticipated at lower flight levels, i.e., terminal areas.
TAS has two sensitivity levels (SL) which are described in Table 1, TAS
Sensitivity Levels. SL A is invoked using the following order of prece-
dence: (1) when the TAS 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. Table
2, Typical Traffic Advisory Conditions for Sensitivity Levels describes
what conditions will cause a TA to be issued. If aircraft is not equipped
with either a radio altimeter or retractable landing gear, TAS will stay in
SL B at all times.
Sensitivity
Level
DESCRIPTION
SL A In sensitivity level A, TAS performs surveillance and tracking func-
tions and provides traffic advisories. The conditions for sensitivity
level A are any one of the following:
(1) Own aircraft is in-flight and is below 2,000 feet AGL, if a radio
altimeter is installed.
(2) Own aircraft is in-flight and the Landing Gear is extended, if a
radio altimeter is NOT installed.