I was just attempting a flight from Hervey Bay to Brisbane in a QantasLink 717, the first time I’ve flown that jet in a while. After passing through 10,000ft I set the autopilot to climb to FL180, and then turned away to do some work. When I looked back the plane was topping out at FL320, and thereafter my attempts to get it to descend had some seriously bizarre impacts. If I set the VS to descend, it climbed, and vice-versa, but not to the magnitudes of VS I was setting in either case. Is this a known issue?
While taking manual control to try to force the darn thing back down, it went into reverse tornado mode and I soon aborted before it could start plummeting at Mach-something into the Pacific.