Garmin MX20 Installation Manual - page 41

   Installation 

MX20 Installation Manual 

560-1025-09 Rev E 

31 

3.  Obtain ICAO address of the aircraft from the FAA only if the UAT/ADS-B system is installed. The 

ICAO address is a unique eight number code assigned to each aircraft. For U.S. registered aircraft, 

it will be necessary to have a specific address code assigned. These address codes are presently 

issued by:  

Federal Aviation Administration 

FAA Aircraft Registry 

P.O. Box 25504 

Oklahoma City, OK 73125 

Tel: 405 954 3116 

Fax: 405 954 3548 

If the aircraft is registered in a country other than the United States, please contact the local 

aviation authority of the country in which the aircraft is registered.  

The ICAO information entered on the MX20 is not used by the GDL 90, but should match the 

ICAO information entered into the GDL 90 Aircraft Personality Module (APM). When connected 

to a GDL 90, the MX20 will display the ICAO information received from the GDL 90.  

4.  Enter in Flight ID. (Required if UAT/ADS-B system is installed.)  

5.  Enter Category Code. (Required if UAT/ADS-B system is installed.) 

Category Code 

Aircraft Weight 

Small 

< 15,500 lbs. 

Medium 

15,500 to 75,000 lbs.  

Large 

75,000 to 190,000 lbs.  

Extra Large 

190,000 to 300,000 lbs.  

Heavy 

> 300,000 lbs.  

High Performance 

> 5g acceleration and > 400 kts 

6.  Enter in Ownship Symbol (Single Engine, Twin, or Jet). 

7.  Set the Terrain Clearance Mode to Normal for all operations.  

See Step 13