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Aircraft rolls right when GTN750 enguaged

Printed From: Just Flight Forum
Category: Just Flight Products
Forum Name: PA-28R Arrow/Turbo Arrow III/IV and Warrior II
Forum Description: Discussion area for the PA-28 aircraft (PA-28 Arrow III, Turbo Arrow III/IV and Warrior II)
URL: http://forum.justflight.com/forum_posts.asp?TID=32027
Printed Date: 26 Apr 2024 at 6:30am


Topic: Aircraft rolls right when GTN750 enguaged
Posted By: freebird
Subject: Aircraft rolls right when GTN750 enguaged
Date Posted: 07 Jan 2018 at 3:43pm
Issue:

GTN750 programmed with departure involving left turnout and track to VOR. Fly runway heading and then enguage autopilot. Aircraft enters a steep bank to the right and stays in that configuration. Not sure if it would ever roll out onto a heading as the turn is so steep that height can''t be maintained and a crash ensues.

Why is this happening?

Cockpit configuration:

  • GTN750 powered up by cycling to KX170, powering on and then cycling back to 750.
  • GTN750 programmed with left turn departure and enroute procedure. Departure activated.
  • All other navaids powered on
  • NAV1 indicating initial VOR and VOR identified. OBS set to inbound heading.
  • NAV1 frequency indicating live on GTN750
  • HDG bug set to runway heading
  • KN62A set to Remote
  • Coupler radio selector set to NAV1
  • A/P On
  • HDG On
  • Nav/approach coupler set to NAV

Simulator configuration:

  • P3D v3.3
  • PA-28R Arrow III Service Pack 2.3
  • Flight 1 GTN750 version 1.22 (Trainer v6211)
  • FSUIPC
  • Windows 8.1


Replies:
Posted By: Mace_RB
Date Posted: 15 Jan 2018 at 9:50am
A slight shallow roll-right after AP engage is a known bug in FSX and it has carried over into P3D.  

HOWEVER, a steep bank isn't normal!  I don't know if the standard roll-right bug is getting amplified on your system, or if there is something more involved going on.  Possibly your roll scalars are set too high in your cfg file?

I have also noticed that my Arrow is having trouble using the "NAV" feature on the AP.  I'm still investigating that, but it may be related to what you're seeing.  I would set up a flight plan, which shows in the GPS100/500.   Then when I initiate the "NAV" AP dial, the plane BANKS HARD RIGHT.   Very interesting that you're seeing the same, albeit with the GTN750, which I do not own...


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