The International Cessna 170 Association

There is one of two reasons [for the Air on Ground failure]. First way to fail it is if you are taxing faster than 15 knot for longer than 10 seconds. This will put the unit in Air mode even if you are on the ground so you needs to slow the taxi before takeoff and after landing. The second way and I think happened is once you started the plane and turn on the ESG let it get it's GPS position before you start to move about 2 minutes and start in STBY mode. After you get a Lat/Lon then press the ALT button just once and then you will see the display go to GND which means you are in ALT mode but on the ground. Now if the pilot presses the ALT button again it will ask you if you want to bypass Ground mode by hitting the FUNC button. If you press this then it puts you in the Air when your on the ground too! Don't do this or you wont pass. So as long as you taxi below 15 knots and the display shows GND in the window he is good. Once he takes off it will switch to ALT mode and then switches back to GND mode when he lands and gets below 15 knots after 10 seconds. I recommend stopping after clearing the runway for about 15 seconds then begin taxi to parking area and shut down at less than 15 knots. Also Try not to do any Touch-N-Go's or landings at other airports during this test because they could loose contact as well and you fail the test. The test does not start over once you land and takeoff again it continues as one flight. It only will begin another flight cycle if you shutdown and restart the ESG transponder. Remember even in STBY mode the ESG is transmitting ADS-B data. Good luck I hope this helps! The AOPA also had a good article on passing this rebate test flight. Here is the Link:

https://www.aopa.org/news-and-media/all ... -clarified