From kls Tue Mar 24 11:38:26 1998 Path: bounce-back Newsgroups: sci.aeronautics.airliners Date: 24 Mar 98 11:38:26 From: kls@ohare.Chicago.COM (Karl Swartz) Subject: Re: A320 emergency procedure References: Message-ID: Approved: kls@ohare.Chicago.COM Sender: kls@ohare.Chicago.COM Organization: Chicago Software Works, Menlo Park, California >For roll: engine thust disymetry. Which also has an effect in both other axes. Yaw is in fact what you're producing from the asymetric thrust, not roll, but the yaw leads to one wing generating more lift than the other, producing the desired roll. Pitch is also affected since the engines are below the centerline and thus any change in thrust will have a pitch effect. Is the yaw damper still effective in Direct Law? Without it, and with the other controls largely crippled, I'd expect you'd end up fighting an uphill battle with Dutch Roll and phugoid oscillations, just like UA 232 (the DC-10 that lost hydraulics and crash landed at Sioux City). -- Karl Swartz |Home kls@chicago.com |Work kls@netapp.com |WWW http://www.chicago.com/~kls/ "The average dog is a nicer person than the average person." - Andrew A. Rooney