Garmin GTN 625 Installation Manual - page 156
GTN 625/635/650 TSO Installation Manual
190-01004-02
Page 6-46
Rev. F
AIR/GROUND LOGIC
Select the source for the air/ground logic.
SQUAT SWITCH SENSE
The squat switch sense field may be set to either High or Low. If the air/ground logic field is set to squat
switch, the squat switch sense field is used to define the state of the squat switch input. If the squat sense
field is set to High, then when the squat switch input is high, the aircraft is considered to be on the ground.
If the squat sense field is set to low, then when the squat switch input is low, the aircraft is considered to be
on the ground.
MAX AIRSPEED (GTX 33 ONLY)
Select the maximum true airspeed for the aircraft. The default is
<= 150 KTS.
ADDRESS TYPE (GTX 33 ONLY)
Select the method of entry of the aircraft address.
ADDRESS (GTX 33 ONLY)
Enter the Aircraft Address. Enter the aircraft registration number in hexadecimal code format. The Octal
code for the Mode S Address is an 8-digit number that can be found on the aircraft registration certificate
or by visiting www.faa.gov and entering the N-number of the aircraft into the N-number inquiry section of
the website. Convert the Octal Mode S Address into hexadecimal format and enter the hex ID of the
aircraft. If the ‘Flight ID’ is configured to SAME AS TAIL, ensure that the correct tail number appears in
the Flight ID field.
Selection
Description
Auto Airborne Off
This is not a valid setting.
Squat Switch
The transponder is connected to a squat switch to determine airborne state.
GPS Data
The transponder is using GPS data to determine the airborne state. Only
select this setting if a GTX input port is configured to GPS.
Altitude Data
Select this setting if a squat switch is not installed and no GTX input ports are
configured for GPS.
Selection
Description
<= 75 KTS
Max aircraft operating speeds less than or equal to 75 knots TAS.
<= 150 KTS
Max aircraft operating speeds less than or equal to 150 knots TAS.
<=300 KTS
Max aircraft operating speeds less than or equal to 300 knots TAS.
<=600 KTS
Max aircraft operating speeds less than or equal to 600 knots TAS.
<=1200 KTS
Max aircraft operating speeds less than or equal to 1200 knots TAS.
>1200 KTS
Max aircraft operating speeds greater than 1200 knots TAS.
UNKNOWN
Max aircraft speed is unknown.
Selection
Description
US Tail
N-Registration Number (GTN main software version 3.00 or later)
HEX ID
Allows technician to enter the aircraft registration number in hexadecimal code
format.