Trafc Advisory System (TAS) (If Equipped)
The optional Trafc Advisory System (TAS) is designed to help in detection
and avoidance of other aircraft. Your airplane may be equipped with either
the L3 Avionics Skywatch TAS or the Garmin GTS 800 Trafc Awareness
System. TAS uses an on-board interrogator-processor and an altitude
reporting transponder for the air-to-air trafc data link. Trafc is displayed
according to TCAS symbology using four different symbols.
TAS Symbol Description
Non-Threat
Trafc
Proximity
Advisory (PA)
Trafc Advisory
(TA)
Trafc Advisory
Off Scale
Figure 7-32 – Trafc Annunciations (TAS)
A Non-threat Advisory, shown as an open white diamond, indicates that an
intruding aircraft is at greater than ±1200 feet relative altitude or the distance
is beyond 5 nm.
A Proximity Advisory indicates that the intruding aircraft is within ±1200 feet
and is within 5 nm range, but is still not considered a threat.
A Trafc Advisory (TA) alerts the crew to a potentially hazardous intruding
aircraft. Closing rate, distance, and vertical separation meet TA criteria.
The GTS 800 surveillance system monitors the airspace within ±10,000 feet
of your airplane’s altitude. Under ideal conditions, the GTS 800 unit scans
transponder trafc up to 12 nm in the forward direction. This range can be
greatly reduced to the sides and behind your airplane, down to approximately
2 nm, due to the directional interrogation signal patterns and shadowing
caused by the fuselage and wings.
NOTE: Under certain conditions, double depictions of aircraft may be
displayed. These double depictions are normally seen as two targets in the
same proximity with the same altitude.
WARNING: The GTS 800 Trafc Advisory System (TAS) is intended for
advisory use only, to aid the pilot in visually acquiring trafc. No avoidance
maneuvers should be based solely upon TAS trafc information. It is the
responsibility of the pilot in command to see and maneuver to avoid trafc.
NOTE: Pilots should be aware of TAS limitations. TAS requires
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, trafc 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 trafc at all times.
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