Anybody have any idea why this happened?

1) VNAV and LNAV selected but AP off.

2) Engage AP, disengage LNAV and engage HDG.

3) A/C tries to maintain hdg 300 for a while in winds.

4) I tweak HDG to 299 and it goes into a heavy bank left. I disengage VNAV (in a panic) and the aircraft moves violently to the left in a way it definitely shouldn't...

 

 

What are you using to inject weather?  What the wind speed/direction jump around on the ND.

If you are using ActiveSky I always recommend turning turbulence and effects sliders down to about 25%.  The simulator platform has very unrealistic turbulence modelling and advanced aircraft will not tolerate that abuse.

2 minutes ago, downscc said:

What are you using to inject weather?  What the wind speed/direction jump around on the ND.

If you are using ActiveSky I always recommend turning turbulence and effects sliders down to about 25%.  The simulator platform has very unrealistic turbulence modelling and advanced aircraft will not tolerate that abuse.

Yes I'm using AS16. Thank you, I will try that - if anybody else has any other suggestions in the mean time these would be very welcome; but what you say is probably right as, in the events leading up to that sudden movement, you can see there are strong winds

 

EDIT: However it doesn't address why it banked left so much for 1 degree change on the HDG bug?

1 minute ago, JKawai said:

Yes I'm using AS16. Thank you, I will try that - if anybody else has any other suggestions in the mean time these would be very welcome; but what you say is probably right as, in the events leading up to that sudden movement, you can see there are strong winds

Based on your other post, it's likely that its hardware or the weather injection.

16 minutes ago, scandinavian13 said:

Based on your other post, it's likely that its hardware or the weather injection.

what about the bank to about 275º when i dialed 299 though? As that is controlled by MCP, not weather or hardware?

1 hour ago, JKawai said:

what about the bank to about 275º when i dialed 299 though? As that is controlled by MCP, not weather or hardware?

Define "control." The MCP can't do much in the way of control if the aircraft is being bombarded with unrealistic weather effects, or bad signals from hardware. For the latter, try setting your AP on, and then hold the yoke full left. What wins, the AP or your hardware?

8 hours ago, scandinavian13 said:

Define "control." The MCP can't do much in the way of control if the aircraft is being bombarded with unrealistic weather effects, or bad signals from hardware. For the latter, try setting your AP on, and then hold the yoke full left. What wins, the AP or your hardware?

Thanks for this. Hardware works perfectly in calibration and in all other phases of flight so I'm a bit confused. Must be the weather engine telling the plane to bank systematically to the left so I've turned turbulence down. 

 

EDIT : just remembered it's also done weird stuff on SIDS too - banking completely away from the direction of it when crossing way points of the SID, even when speed is slow enough to make them. I'll record video every time now to see if I can capture anything but in the mean time I've turned down turbulence as I say.

3 hours ago, JKawai said:

Thanks for this. Hardware works perfectly in calibration and in all other phases of flight so I'm a bit confused. Must be the weather engine telling the plane to bank systematically to the left so I've turned turbulence down. 

 

EDIT : just remembered it's also done weird stuff on SIDS too - banking completely away from the direction of it when crossing way points of the SID, even when speed is slow enough to make them. I'll record video every time now to see if I can capture anything but in the mean time I've turned down turbulence as I say.

My vote is EZDok camera shake. Then perhaps AS turbulence.

52 minutes ago, scandinavian13 said:

My vote is EZDok camera shake. Then perhaps AS turbulence.

EDIT: You gave explanation on other thread, post deleted