Garmin GTX 335 Series Pilot's Manual - Page 25

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4.2.2

No Source of Heading Data

Due to helicopter maneuverability, ground track may not correspond to heading at low

speeds. Limitations apply to GTX 345 installations with no source of heading data

provided.

ADS-B traffic will not display when operating at less than 15 knots groundspeed. Aural

traffic alerts will issue, appropriately. If a TAS/TCAS is interfaced to the GTX 345 then:

• TAS/TCAS traffic targets will continuously display at all speeds.

• If in excess of 15 knots in backward or sideway flight, TAS/TCAS and ADS-B

targets may not correlate. Two targets may appear on the display for each

actual target being received over both ADS-B and TAS/TCAS.

To optimize situational awareness the GTX 345 correlates TCAD/TAS/TCAS with

ADS-B In traffic, combining data from all sources. This creates the most accurate and

comprehensive traffic picture. When a correlation is made the most relevant target is

displayed. There are no duplicates. Any active traffic system, or ADS-B traffic that is not

correlated, will also display.

When a GTX 3X5 and TAS/TCAS system integrate, the GTX 3X5 controls the operating

mode of the TAS/TCAS system. It does this by using both its own air/ground logic and the

available mode controls from the interfaced display. The GTX 345 provides all traffic aural

alerts.

190-01499-00 Rev. C

GTX 335/345 Pilot's Guide

GTX 3X5 XPDR

1 – GTX 3X5 SERIES XPDR

4-3