Mitsubishi MU-2 Marquise v2 autopilot issues.

[jfwharton]

I just purchased the MU-2 Marquise v2 and cannot get the autopilot to engage in NAV mode.  I'm flying the GNS 530 vairant.  Have a flight plan loaded but after takeoff I cannot get NAV to select.  HDG works but NAV does not.  What am I missing.  I also tried using the Reality XP GTN 750 but it  does not couple to the HSI.

Edited July 16, 2022 by jfwharton

[Cameron]

Sounds like you don't have GPS Steering (GPSS) enabled.

I'd type it out, but better to just watch this great explanation from @Graeme_77: https://twitch.tv/videos/1528083688

He starts discussing it around the 25 minute mark.

[tkyler]

49 minutes ago, jfwharton said:

I just purchased the MU-2 Marquise v2 and cannot get the autopilot to engage in NAV mode.  I'm flying the GNS 530 vairant.  Have a flight plan loaded but after takeoff I cannot get NAV to select.  HDG works but NAV does not.  What am I missing.  I also tried using the Reality XP GTN 750 but it  does not couple to the HSI.

ANYBODY who reads this....I am working on these AP docs soon.  We were quite sure that many folks would ask this question. It is a very common mis-conception.  Cameron is right, this is a GPSS concept and will probably take some explanation for folks to understand how it works.  Even I myself, being a bit of an old-timer,  had to get a AP lesson from Philipp at Laminar to fully understand and implement it.  Rest assured though, that once you get the hang of it, it is quite a satisfying way to fly.  NAV only works with radio signals, not GPS.  Stay tuned for those AP docs soon.

-TomK

Edited July 16, 2022 by tkyler

[swapilot48]

Lucky for me, this is almost exactly like the Twin Otter I fly for work so I am used to the concept. It was bizarre at first though, that HDG controls not only HDG but also GPS tracking. 

[jfwharton]

Thank you for that information.  An unusual way for the autopilot to work but it works now.  Now to figure out how to get the Avitab to work.  I just get a blank screen.

 

OK nevermind.  I found the power button to turn on the avitab tablet and now have the checklists.

Edited July 16, 2022 by jfwharton