Lynx
®
NGT-9000
Pilot’s Guide 4-1
Principles of TAS Operation
CHAPTER 4
PRINCIPLES OF TAS OPERATION
INTRODUCTION
This chapter describes Traffic Advisory (TA) criteria and other factors
that affect the display of traffic symbols for models of the Lynx
NGT-9000 with a Active Traffic Awareness System (TAS). Table 4-1
summarizes the criteria necessary to display a traffic advisory. Figure
4-1 shows the TAS Traffic Zone Graphic.
SENSITIVITY LEVELS
The A or B sensitivity level is used to determine when to display a
TA. Having two sensitivity levels allows the unit to reduce the number
of nuisance TAs during takeoff and landing (sensitivity level A), and
to maximize the detection of TAs during the cruise phase of flight
(sensitivity level B).
Sensitivity Level A
Sensitivity level A consists of two criteria for displaying a TA:
The intruder aircraft enters into an area of airspace surrounding
ownship defined by a 0.2 nmi horizontal radius and a height of
±600 ft from ownship
The intruder aircraft approaches ownship on a course that will
intercept ownship within 15 or 20 seconds (within 15 seconds for
a non-altitude reporting intruder aircraft; within 20 seconds for an
altitude reporting intruder aircraft).
The unit uses sensitivity level A in the following situations (corresponds
to numbers 1, 2, 5, 6, 13, and 14 in Table 4-1):
Ownship has a valid AGL (above ground level) altitude and is
below 2,000 ft AGL.
The unit calculates height above terrain using GPS Altitude and
nearest airport elevation.
Ownship AGL Altitude is Invalid , and ownship ground speed is
available and is less than 120 knots.
1.
2.
1.
2.
3.
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