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Something odd happened on autopilot yesterday...

PostPosted: Thu Nov 15, 2007 5:28 pm
by greenhorn
Hi all,

I was flying the BAE 146 Avroliner (the red one in the gambling livery) north over the UK at 26000 ft.  Air pressure was 3020mb, I was cruising at 300kts IAS on autopilot (with NAV switched on - basically the plane was flying itself  8-))

All of a sudden, the plane started swinging wildly across the sky, porpoising through 2000ft or so, and swinging through 90* left to right and more, basically it got so bad I had to disengage autopilot and drop down 10000ft before the wing stalled.  Very odd.

I was using the 15min update real-life weather, it was cold and fairly windy, pressure was as I said earlier.  Basically, was this just a glitch, or something I was doing wrong?  As a last resort before dropping out of autopilot and descending I switched on the Yaw Dampener, but it had no effect.

Thanks for replies, I'd like to know what killed my 80 or so passengers :D

Cheers

Seb

Re: Something odd happened on autopilot yesterday.

PostPosted: Thu Nov 15, 2007 5:43 pm
by MattNW
Icing maybe?

Re: Something odd happened on autopilot yesterday.

PostPosted: Thu Nov 15, 2007 5:51 pm
by Wii
Did you have autothrottle on?

Re: Something odd happened on autopilot yesterday.

PostPosted: Thu Nov 15, 2007 5:57 pm
by greenhorn
Autothrottle, Flight Direction, Altitude Hold, NAV, the entire autopilot basically, was on.

Re: Something odd happened on autopilot yesterday.

PostPosted: Thu Nov 15, 2007 6:39 pm
by Ashar
It's FS ;D

Re: Something odd happened on autopilot yesterday.

PostPosted: Thu Nov 15, 2007 7:02 pm
by Brett_Henderson
Sounds like you encountered a massive wind shift... and the autopilot got into an "overcorrect/undercorrect" cycle.. It's happened to me before. A large change in wind will bring on large corrections by the autopilot (both pitch and throttle) and if the wind shifts back quickly, you've got a doubled effect for a period of time...

Re: Something odd happened on autopilot yesterday.

PostPosted: Fri Nov 16, 2007 3:18 pm
by beaky
When in doubt, disengage that AP! Same applies in RL...

Re: Something odd happened on autopilot yesterday.

PostPosted: Fri Nov 16, 2007 6:12 pm
by greenhorn
Thanks guys, I didn't think it was me :D

As a point of interest, as I was descending in manual control the aircraft was still getting blown around quite a lot so maybe it was a glitch in the wind engine.

Cheers

Seb