Garmin manual GDL 88 Integration with TCAD/TAS/TCAS, Tcas/Tas

4.2.2GDL 88 Integration with TCAD/TAS/TCAS I

Installations with the GDL 88 interface to a TAS/TCAS/TCAD traffic system require a display to be installed.

Figure 4-4 GDL 88 With TCAS Not In Ground Station Coverage

When an active traffic system is interfaced with a GDL 88, the GDL 88 receives traffic from the active traffic system and attempts to match (or “correlate”) this traffic with ADS-B traffic that the GDL 88 has received and is already tracking. When a correlation is made, the active traffic system or ADS-B target with the most accurate information is displayed to the flight crew. Any active traffic system or ADS-B traffic that is not correlated will also be displayed for the flight crew. The correlation of traffic by the GDL 88 ensures that only the most accurate, and no duplicate, traffic targets are displayed for the flight crew’s situational awareness.

When interfaced to a TAS or TCAS system, traffic alerts are provided as follows:

Traffic

Correlated?

TAS/TCAS

Alert Active?

CSA Alert

Active?

Aural Alert Source

Visual Alert Source

Yes	Yes	N/A	TCAS/TAS	TCAS/TAS
Yes	No	N/A	None	None
No	Yes	Yes	TCAS/TAS (prioritized)	TCAS/TAS
			GDL 88	GDL 88
No	No	Yes	GDL 88	GDL 88

Table 4-1 TAS/TCAS Traffic Alerts

190-01122-03 Rev. A GDL 88 ADS-B Transceiver Pilot’s Guide 4-5