Cessna G1000

[spoolinup22]

Yeahh well I think I get to go up again later this week...I'll try to take pics and what not.

 

[Ivok]

Hi,
There is a picture of level flight with nice headwind You can see GND mode as well as track...C172 can fly backwards...)

 

[fholbert]

Didn't know a Cessna 172 could fly at 30kts.

Do they go that fast?

 

[gotWXdagain]

Lightly loaded and in the cold I've had a 172S as low as 25 indicated and still hanging on. Just barely.

 

[ProudPilot]

I do remember something about it going automatically into GND, which will still reply to the beacon with a code, just not alt. Hence it was policy to manually go to alt, good primacy training. Automation is nice, but you still have to be PIC.

 

[Itchy]

I always thought it was activated by GS > 30 via gps. Not airspeed.

 

[Sosee]

The SoCal controllers in the Los Angeles basin would have on air strokes if this happened with any regularity out here.

 

[JustinS]

A little slow to recover on that 2nd spin, letting the airspeed hit Vne.

That second one wasn't a spin. That was a spiraling dive! I can't believe they let it get to Vne before recovering.

 

[ppragman]

Lightly loaded and in the cold I've had a 172S as low as 25 indicated and still hanging on. Just barely.

Yeah I've flown the 172 backwards before

 

[jwp_145]

I've never seen the transponder go back to GND mode during slow flight. The AHRS, on the other hand, starts getting confused below 25 kts GS or so...

I did 25 knots groundspeed backwards according to the approach controller... the AHRS went absolutely apenuts.

 

[jwp_145]

Any airplane can fly at 30 knots. Ground or indicated.

We got the CRJ 200 down to 85 knots indicated in the simulator during a banking pushover.

 

[ProudPilot]

Ok, so here is the manual:

http://static.garmincdn.com/pumac/190-00498-07_0A_Web.pdf

Page 122, simply states:
"Altitude Mode is automatically selected when the aircraft becomes airborne. Altitude Mode may also be selected manually by pressing the ALT Softkey."

So, it depends on the aircraft, however

https://www.faa.gov/training_testing/training/fits/guidance/media/G1000.pdf

Page 5, states:
"As installed in most aircraft, these units transition to an ALT reporting mode at a ground speed of 30 Kt."

That is from Garmin to the FAA for DPE's, whose is down with the OPP (yeah you know me), in ATL, ATT. I think that is about as in depth as we can get before you call the Manufacturer of the aircraft as to what they set the definition of 'airborne' is, or what Garmin has customized to those specific aircraft. I do recall that it would go to GND in flight at times, and I forget when that happened and what our rule was. It's been years. However, that is why we always had the students manually set it for good situational awareness and aircraft transition. It wasn't an unsat item if they forgot it, but it got brought up. If ever in doubt, press ALT.

Good Luck, Fly Safe.