Garmin GDL 84 Pilots Guide - Page 37

Installation Configurations - position fault

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6 INSTALLATION CONFIGURATIONS 6.1 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 configuration is limited by 14 CFR 91.227 to use below FL180. 6.1.2 GDL 88 with ADS-B Out Transmission Disabled 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, is required. For aircraft operated above FL180, a 1090 MHz ADS-B Out compliant system is required. 6.1.3 GDL 84/88 Only - No Display In a minimal installation, the GDL 84/88 provides the required ADS-B Out functionality. This configuration requires standalone annunciators and control switches in the cockpit. An optional traffic annunciation light in the cockpit can provide visual CSA alerts. As a configuration option, Aural alerts can provide for these threat aircraft, to include directionality from the ownship and range. 6.1.4 External ADS-B Annunciator The external ADSB annunciator is only required when the GDL 84/88 is not interfaced to a compatible control display unit and is always required for GDL 84/88 installations. When one or more GDL 84/88 faults are present, the ADS-B annunciator activates one or both of two lights to indicate the presence and type of the highest priority GDL 84/88 fault present. For example, if both a No Position (priority 2) fault and a Fault (priority 3) are present, the ADS-B annunciator will indicate the presence of a No Position fault. In the single annunciator configuration, within the first 20 seconds after power up the light will flash if the unit has a fault that requires service. The faults that cause the flashing do not directly impact the capability for the GDL 84/88 to provide rule compliant ADS-B Out transmissions. They do, however, require attention/service and could degrade the overall performance of the GDL 84/88. A solid annunciator light may be caused by the following: a 190-01122-03 Rev. E Garmin GDL 84/88 ADS-B Transceiver Pilot's Guide 6-1

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6-1
190-01122-03
Rev. E
Garmin GDL 84/88 ADS-B Transceiver Pilot’s Guide
6
INSTALLATION CONFIGURATIONS
6.1
Installation Configurations
6.1.1
G
DL 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 configuration is limited by 14 CFR 91.227
to use below FL180.
6.1.2
GDL 88 with ADS-B Out Transmission Disabled
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, is required. For aircraft operated above FL180, a 1090 MHz ADS-B
Out compliant system is required.
6.1.3
GDL 84/88 Only – No Display
In a minimal installation, the GDL 84/88 provides the required ADS-B Out
functionality. This configuration requires standalone annunciators and control
switches in the cockpit. An optional traffic annunciation light in the cockpit can
provide visual CSA alerts. As a configuration option, Aural alerts can provide for
these threat aircraft, to include directionality from the ownship and range.
6.1.4
External ADS-B Annunciator
The external ADSB annunciator is only required when the GDL 84/88 is
not interfaced to a compatible control display unit and is always required for
GDL 84/88 installations. When one or more GDL 84/88 faults are present, the
ADS-B annunciator activates one or both of two lights to indicate the presence
and type of the highest priority GDL 84/88 fault present. For example, if both
a No Position (priority 2) fault and a Fault (priority 3) are present, the ADS-B
annunciator will indicate the presence of a No Position fault.
In the single annunciator configuration, within the first 20 seconds after
power up the light will flash if the unit has a fault that requires service. The
faults that cause the flashing do not directly impact the capability for the
GDL 84/88 to provide rule compliant ADS-B Out transmissions. They do,
however, require attention/service and could degrade the overall performance
of the GDL 84/88. A solid annunciator light may be caused by the following: a