7-2
ENSTROM 480B RFM SUPPLEMENT
Rev. 1
Report No. 28-AC-061
Mar 21/17
7-2. Operation
1. The GTS 800 is capable of tracking up to 45 intruding
aircraft equipped with Mode A or C transponders, and
up to 30 intruders equipped with Mode S transponders.
A maximum of 30 aircraft with the highest threat
potential can be displayed simultaneously.
2. TAS Surveillance Volume: The GTS 800 surveillance
system monitors the airspace within ±10,000 feet of
own altitude. Under ideal conditions, the GTS 800 unit
scans transponder traffic up to 22 nm in the forward
direction. The range is somewhat reduced to the sides
and aft of own aircraft due to the directional
interrogation signal patterns. In areas of greater
transponder traffic density or when TCAS II (Traffic
Alert and Collision Avoidance System II) systems are
detected, the GTS 800 automatically reduces its
interrogation transmitter power (and therefore range) in
order to limit potential interference from other signals.
When paired with a 1090 MHz extended squitter
transponder, the GTS 800 receives 1090ES ADS-IN
traffic information from other 1090ES ADS-B OUT
compliant airborne aircraft to enhance the positional
accuracy and display of traffic within the TAS
surveillance range. Traffic data supplied only by ADS-B
Ground Based Transceivers (GBTs) is not displayed.
3. The GTS 800 TAS symbology used to depict intruding
traffic is shown in Table 7-1 and described as follows.
A Traffic Advisory displayed as a yellow circle or
triangle, alerts the crew to a potentially hazardous
intruding aircraft, if the closing rate, distance, and
vertical separation meet TA criteria. A Traffic
Advisory that is beyond the selected display range
(off scale) is indicated by a half TA symbol at the
edge of the screen at the relative bearing of the
intruder.
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