Wobble at Altitude?

[el_kab0ng 29]

I've been doing relatively short and low level (under 30,000 feet) hops around Texas without issue. Today I decided to stretch out the 550 with a high altitude (39000 feet) long distance flight (~1200nm) and noticed that once I was at altitude, a slight wobble became pretty significant the longer I let the AP try to correct it. My only recourse was to disable the AP, stabilize the wobble, then re-activate the AP. Have any of you guys witnessed this before? I had the yaw damper and 1/2 bank enabled (and tried to disable both without any difference in the wobble), so I'm not sure what could have caused it.

 

Thoughts?

[CAPFlyer 2]

Typically, if you have that kind of wobble, you're either too slow, too heavy, or both.  If you're above 75% payload, don't go much above FL330 until you burn off some of your fuel and make sure you're keeping your speed up.

 

BTW, I've talked to a couple of real world Citation pilots and they say that the real thing is fairly sensitive to weight and the real AP does tend to hunt quite a bit when heavy.

[el_kab0ng 29]

Interesting. I wonder if that's how Carenado modeled their 550 or if it was just a glitch (kind of like the CS757 does with some of the later versions of FSUIPC). I'll keep an eye on it and report back any updates from additional flights.

[dpcnh 0]

Think it is an issue with their FMS.  Altitude hold without the FMS works fine.  As soon as you kick on the FMS Nav, the plane starts to Oscillate.  

[el_kab0ng 29]

Yeah.. I learned that lesson with the B1900D and never turn on the FMS if I'm using GPS for navigation. I haven't seen the wobble since I first reported it, but I did have a weird dual engine failure on approach to KAUS recently (I had plenty of fuel and static controls, so I'm not sure what happened there), so it looks like I still have gremlins in the system.