Date: 17 Sep 97 02:49:17 From: email@example.com (Larry Stone) References: 1
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In article <airliners.1997.2180@ohare.Chicago.COM>, "Ruth or Doug Blue" <firstname.lastname@example.org> wrote: >Several of us (non pilots) have been told that a large passenger jet should >not descend below about 10,000 feet at more than about 250 knots air speed >in controlled flight. Should that speed be inadvertently exceeded, what >sort of problems would arise? We felt that they might be related mainly to >temperature increase in the denser air, but wondered if anyone had detailed >information. That's because it's against the law in the U.S. (or more techinically - the FAR's (Federal Air Regulations)). It's because the airspace is so much more congested as you go lower. I don't know of any aerodynamic reasons for it and it may be exceeeded if operationally required. Many heavy international departures do operationally require it (to keep their climb speed a safe margin above their stall speed) - I've heard pilots of some of these flights tell ATC they'll need as fast as 330 knots. -- -- Larry Stone --- email@example.com http://www.wwa.com/~lstone/ Belmont, CA, USA My opinions, not United's.