9-12
GTN 625/635/650 Pilot’s Guide
190-01004-03 Rev. P
Traffic
9.4
TAS (Optional)
NOTE:
TIS and Traffic Advisory System (TAS) may not both be configured
at the same time.
TAS data comes from a TAS unit such as a Garmin GTS 800 or 820, Skywatch
497, KTA 810, or other unit.
Refer to the appropriate Traffic Advisory System’s Pilot’s Guides for a detailed
discussion of the respective traffic advisory system.
The type of traffic systems that is installed is described by the Traffic page
keys. If a Traffic Advisory System (TAS) is configured, a
TRF Status
and
ALT
Filter
key will be displayed.
NOTE:
Pilots should be aware of TAS system limitations. TAS systems
require transponders of other aircraft to respond to system interrogations.
If the transponders do not respond to interrogations due to phenomena
such as antenna shading or marginal transponder performance, traffic may
be displayed intermittently, or not at all. Aircraft without altitude reporting
capability are shown without altitude separation data or climb descent
indication. Pilots should remain vigilant for traffic at all times.
WARNING:
The Traffic Advisory System (TAS) is intended for advisory use
only to aid the pilot in visually acquiring traffic. No avoidance maneuvers
should be based solely upon TAS traffic information. It is the responsibility
of the pilot in command to see and maneuver to avoid traffic.
A Traffic Advisory System (TAS) enhances flight crew situational awareness
by displaying traffic information for transponder-equipped aircraft. The TAS
also provides visual and aural traffic alerts including voice announcements to
assist in visually acquiring traffic.
When the TAS is in Operating Mode, the unit interrogates the transponders
of intruding aircraft while monitoring transponder replies. The TAS uses this
information to derive the distance, relative bearing, and if reported, the altitude
and vertical trend for each aircraft within its surveillance range. The TAS then
calculates a closure rate to each intruder based on the projected Closest Point of
Approach (CPA). If the closure rate meets the threat criteria for a Traffic Advisory
(TA), visual and aural alerting is provided.
Summary of Contents for GTN 625
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