jrouault's GPSV Problem

[jrouault]

What was the resolution to this pitch problem? I am experiencing the same exact issue.

Thanks,

Jason

[jrouault]

I have an RV-7A with the DigiFlight IIVSGV

[N65XX]

When I was building and powered up my DII VSG, the roll servo began shaking the stick. I called TT and they walked me thru the programming functions. TT then diagnosed a bad ground. Sure enough, the ground wire in the bundle was broken inside the insulation. I replaced the ground and it worked as advertised. A shot in the dark but I hope this helps. Dan

[jrouault]

I doubt that is the issue... I can put the A/P in GPSS mode and it does lateral navigation fine. I can adjust vertical speed up or down and the A/P seems to work fine... It is only when I engage GPSSV that I get the dive or climb.

[TrutrakTech]

I doubt that is the issue... I can put the A/P in GPSS mode and it does lateral navigation fine. I can adjust vertical speed up or down and the A/P seems to work fine... It is only when I engage GPSSV that I get the dive or climb.

Ah, there's some new info. What is your GPSV steering command source? So the altitude hold and VS features work correctly?

[jrouault]

I can set things up so GPS is either source from a GNS340W or an Advanced Flight System EFIS. I get the same behavior no matter which I source from. And yes, Alt hold and VS work features work correctly

[TrutrakTech]

Jason, I haven't forgotten about you. I'm going to run this situation by a few of the others here and see if we can come up with an idea for you. I'll let you know. Thanks!

[TrutrakTech]

Jason, is this behavior always at the same airport? Have you tried other airports and had better results?