Garmin International
1200 E. 151
st
Street Olathe, KS 66062
USA
ROTORCRAFT FLIGHT MANUAL SUPPLEMENT
for STC SR02123SE
GARMIN GDL 84H/88H ADS-B TRANSCEIVER
190-01310-J2 Rev. 1
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SYSTEM DESCRIPTIONS
Pilot’s Guide
The Garmin GDL 84/88 Pilot’s Guide, part number and revision listed below,
contain additional information regarding GDL 84H/88H system description,
control, and function. Cockpit Reference Guides and Pilot Guides for interfaced
displays provide additional operating information.
GDL 84/88 ADS-B Transceiver Pilot’s Guide
P/N 190-01122-03 Rev E or later
Mode 3/A Code, IDENT, and Emergency Status
Mode 3/A Code, IDENT, and Emergency Status data that is included in the
ADS-B OUT message is obtained automatically by the GDL 84H/88H. No pilot
action except normal use of the transponder is required.
Flight ID
Flight Identification will default to the aircraft registration. If interfaced with a
Garmin transponder or GTN an alternate Flight ID can be entered via those
interfaces and will automatically be updated at the GDL 84H/88H.
Transmitted Air Ground Status
The ADS-B OUT message includes the air/ground status of the rotorcraft.
Rotorcraft which do not have a Radar Altimeter OR GNS or GTN display
interfaced to the GDL 84H/88H will transmit “in air” any time the collective is
raised. Rotorcraft which have a Radar Altimeter OR GNS or GTN display
interfaced to the GDL 84H/88H will transmit “in air” any time the height above
the surface is more than 25 feet or groundspeed is in excess of 15 knots.
Pressure Altitude Broadcast Inhibit
For rotorcraft with an interfaced Garmin GTX 33/330/32/327 or SL 70
transponder the broadcast of pressure altitude is controlled by the transponder
mode. Turning the transponder to ALT will also broadcast pressure altitude in
the ADS-B output. Turning the transponder to ON will inhibit pressure altitude
from being broadcast.
For rotorcraft without a Garmin GTX 33/330/32/327 or SL 70 transponder
pressure altitude broadcast is controlled via a separate switch or interfaced GNS
or GTN display.
Summary of Contents for GDL 84H
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