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Introduction
SECTION 3
TRAFFIC AVOIDANCE OPERATION
INTRODUCTION
The Traffic Function of the Bendix/King KMD 250 Multi Function Display
allows for the display and control of one of several models of traffic
avoidance systems. Some examples are TCAS I (Traffic Collision
Avoidance System), TCAS II, TAS (Traffic Avoidance System) and TIS
(Traffic Information Service).
This section describes the operation of the KMD 250 display for control-
ling the display of traffic. For detailed information on the proper use and
interpretation of the displayed traffic data when using TCAS I, TCAS II
and TAS systems, please reference the pilot's guide that is provided
with the traffic avoidance system.
An active traffic avoidance system (TCAS I, TCAS II or TAS) is used for
detecting and tracking aircraft near your own aircraft. Aircraft detected,
tracked, and displayed are referred to as Intruders. Intruders are shown
as symbols on the traffic display. The system identifies the relative
threat of each Intruder by using various symbols and colors. The
intruder's altitude, relative to your own aircraft's altitude, is annunciated if
the Intruder is reporting altitude. A trend arrow is used to indicate if the
Intruder is climbing or descending more than 500 feet per minute.
The passive Traffic Information Service (TIS) is a data link service that
provides information similar to VFR radar traffic advisories normally
received over voice radio. The data is received from the terminal Mode
S radar system through a TIS capable Mode S transponder to the KMD
display once per radar scan (approximately every 5 seconds).
TIS provides the relative position, relative altitude, altitude trend, and
estimated ground track angle for as many as 8 intruders that are within 7
NM horizontally and +3,500/-3000 feet vertically of the aircraft receiving
TIS. Only aircraft with operating transponders that are within the surveil-
lance volume of a TIS Mode S radar are visible to TIS. Terminal Mode
S radars equipped with TIS provide the service to 55 NM (or possibly
greater) of the radar location, and as low as the "line of site" limitation
inherent to radar surveillance.
ATC procedures and the "see and avoid concept" will continue to be the
primary means of ensuring aircraft separation. However, if communica-
tion is lost with ATC, TCAS/TAS/TIS adds a significant backup for colli-
sion avoidance.
3-1
Rev 2 Apr/2004
KMD 250 Pilot's Guide
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