Filter
Top Products
Rev 2 Apr/2004 KMD 250 Pilot’s Guide
3-9
Section 3
Traffic Avoidance
Traffic Information Service
TRAFFIC INFORMATION SERVICE (TIS)
This section applies only to TIS systems.
TIS is an alerting system that provides visibility to nearby traffic
enhancing “see and avoid” collision avoidance. It’s purpose is to
increase situational awareness by supplying information to assist in visu-
ally acquiring nearby aircraft. TIS does not relieve the pilot of “see and
avoid” responsibility. No avoidance maneuvers are provided or recom-
mended by TIS.
The service is offered through the Federal Aviation Administration’s
Mode S terminal sensors and uses the same surveillance information
provided to ATC. Estimated bearing, distance, altitude and heading
information for aircraft within 7 NM and +3,500/-3,000 feet altitude of
your aircraft is sent over the Mode S datalink to the TIS display. The
pilot is also alerted to aircraft that are predicted to be within 30 seconds
of a potential collision, no matter the distance or altitude.
Target aircraft are displayed only if operating a Mode A, C or S
transponder. TIS operation is transparent to ATC and requires no con-
troller intervention.
When the onboard TIS system makes a request for TIS, the request is
sent via the Mode S transponder through the datalink. The first available
Mode S sensor capable of supporting TIS for your aircraft responds by
sending data back through the datalink on every scan of the sensor
(approximately every 5 seconds). TIS will be provided by the sensor as
long as the aircraft is within coverage range of that sensor. When
entering the coverage range of another sensor, TIS will continue pro-
vided the next sensor is TIS capable. The transfer of service is auto-
matic. In addition to traffic data, the aircraft receives status messages
that advise the pilot when TIS service has been initiated, is continuing, or
has been terminated.
While coverage varies with terrain and local site parameters, “line-of-
sight” coverage is to be expected within 55 NM of a TIS capable Mode S
sensor. Terrain and obstacles can cause areas of no radar coverage.
KMD 250 w/ TIS Display
KT 73 Mode S
Mode S
Sensor
TIS
ALGORITHMS