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4-5
190-01122-03 Rev. A
GDL 88 ADS-B Transceiver Pilot’s Guide
4.2.2 GDL 88 Integration with TCAD/TAS/TCAS I
InstallationswiththeGDL88 interfacetoaTAS/TCAS/TCAD traffic system
requireadisplaytobeinstalled.
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)
GDL 88
TCAS/TAS
GDL 88
No No Yes GDL 88 GDL 88
Table 4-1 TAS/TCAS Traffic Alerts