Garmin GDL 88 User Manual
6-1
190-01122-03 Rev. A
GDL 88 ADS-B Transceiver Pilot’s Guide
6
INSTALLATION CONFIGURATIONS
6.1
Possible Installation Configurations
6.1.1
GDL 88 with ADS-B Out Transmission Enabled
The GDL 88 can provide for both the ADS-B Out and ADS-B In functionality.
In this case, the GDL 88 transmits ADS-B messages on 978 MHz and receives
ADS-B, ADS-R, TIS-B, and FIS-B services on the 1090 and 978 MHz links using
its dual link receive capabilities. This installation is limited by FAR 91.227 to use
below FL180.
ADS-B, ADS-R, TIS-B, and FIS-B services on the 1090 and 978 MHz links using
its dual link receive capabilities. This installation is limited by FAR 91.227 to use
below FL180.
6.1.2
GDL 88 with ADS-B Out Transmission Disabled
With ADS-B Out transmission disabled, the GDL 88 can provide for only ADS-B
In functionality. In this case, the GDL 88 receives ADS-B, ADS-R, TIS-B, and FIS-B
services on the 1090 and 978 MHz links using its dual link receive capabilities. In
order for the ADS-B Out mandate to be met, another LRU, Such as a Garmin GTX
330ES transponder, must be installed that complies with the ADS-B Out mandate
on either the 978 MHz or 1090 MHz link. For aircraft operated above FL180, a
1090 MHz ADS-B Out compliant LRU will be required.
services on the 1090 and 978 MHz links using its dual link receive capabilities. In
order for the ADS-B Out mandate to be met, another LRU, Such as a Garmin GTX
330ES transponder, must be installed that complies with the ADS-B Out mandate
on either the 978 MHz or 1090 MHz link. For aircraft operated above FL180, a
1090 MHz ADS-B Out compliant LRU will be required.
6.1.3
GDL 88 Only – No Display
In a minimal installation, the GDL 88 provides the required ADS-B Out
functionality with a standalone set of annunciators and control switches installed
in the cockpit. When a GDL 88 is installed without interface to an external
display, some ADS-B In functionality is still retained. A traffic annunciation light
is installed in the cockpit for CSA alerts and aural alerts are provided for these
threat aircraft, to include directionality from the ownship and range.
in the cockpit. When a GDL 88 is installed without interface to an external
display, some ADS-B In functionality is still retained. A traffic annunciation light
is installed in the cockpit for CSA alerts and aural alerts are provided for these
threat aircraft, to include directionality from the ownship and range.