Installation Instructions

GTN 6XX/7XX AML STC Installation Manual 190-01007-A3
Page 5-68 Rev. 4
5.5.4.9.1.4 Aircraft Category
This setting selects the aircraft emitter category for which the GDL 88 is installed. Select Light for
aircraft with maximum gross weight less than 15,500.
5.5.4.9.1.5 Aircraft Length
Enter the length of the aircraft. This field has a range of 1 to 300 feet.
5.5.4.9.1.6 Aircraft Width
Enter the width (wingspan) of the aircraft. This field has a range of 1 to 300 feet.
5.5.4.9.1.7 Stall Speed
The stall speed setting is used in the GDL 88 air/ground determination for “Light” category aircraft
(aircraft weight is less than 15,500 lbs).
Enter the aircraft stall speed. This field has a range of 30 to 100 knots. Use the aircraft landing
configuration stall speed (Vs0) as specified in the aircraft pilot operating handbook (POH) or aircraft
approved flight manual supplement (AFMS).
5.5.4.9.1.8 ADS-B Transmit
This setting enables or disables the GDL 88 UAT transmitter. If it is desired for the GDL 88 to transmit,
select Enable, otherwise select Disable (default configuration).
NOTE
The GDL 88 is capable of transmitting ADS-B messages while in configuration mode.
Ensure the aircraft assigned ICAO 24-bit address is entered prior to enabling the GDL 88
UAT transmitter.
5.5.4.9.1.9 FIS-B Processing
This setting enables or disables the processing of Flight Information Service Broadcast (FIS-B). If it is
desired for the GDL 88 to process FIS-B, select Enabled (default configuration), otherwise select
Disabled.
5.5.4.9.1.10 Internal GPS/SBAS
If the GDL 88 unit has an internal GPS/SBAS present, this setting enables or disables the internal
GPS/SBAS receiver (GDL 88/D with internal GPS/SBAS only). If it is desired to utilize the internal
GPS/SBAS receiver as a GPS source, select Enabled (default configuration), otherwise select Disabled.
5.5.4.9.1.11 Transponder Interrogation
This setting enables or disables the transponder interrogation control panel interface. If it is desired for the
GDL 88 to communicate with the transponder wirelessly, select Enabled otherwise select Disabled.
Refer to the GDL 88 Part 23 AML STC Installation Manual.
5.5.4.9.1.12 UAT Call Sign ID Logic
This setting configures whether the Mode 3/A Code (Squawk Code) is transmitted in the UAT ADS-B
Out message. This setting must be set to Enabled (default configuration), allowing the GDL 88 to
transmit the pilot-entered Mode 3/A Code (Squawk Code) to FAA ground stations.