Re: Squat interlock

Date:         10 Jul 99 02:33:39 
From: (Jonathan Thornburg)
Organization: Universitaet Wien (Vienna, Austria) / Institut fuer Theoretische Physik
References:   1 2 3 4
Next article
View raw article
  or MIME structure

In article <airliners.1999.707@ohare.Chicago.COM>,
James Matthew Weber  <> wrote:
> I think you can get the spoiler to come to the 'in flight' detent with
> out the sqat switches,  but that isn't automatic. On Boeing Aircraft at
> least, it is possible to deploy reverse thrust, brakes, and
> spoiler/speed brakes at any time (although it may not be easy to do so,
> it can be done).
> However at least on an A320 this is not the case, and this lead to the
> loss of a Lufthansa A320 at Warsaw a few year ago in what should have
> been a non-event.

I'm not wild about some of Airbus's GUIs, but blaming their computer
systems for this sort of accident (with the implication that
less-computerized designs are free from similar problems) is just
plain wrong:

As David Davidson <> noted (12 Oct 1998) in
article <airliners.1998.1620@ohare.Chicago.COM>),
> A Piedmont 737-200 had a very similar accident. The crew landed too fast
> on a wet runway. The airplane didn't settle down and didn't get the
> weight-on-wheels signal or wheel spinup. The reversers wouldn't deploy
> and the spoilers didn't come up by themselves. Guess what? No computers
> involved, just a bunch of relays and switches.

-- Jonathan Thornburg <>
   Universitaet Wien (Vienna, Austria) / Institut fuer Theoretische Physik
   "The first strike in the American Colonies was in 1776 in Philadelphia,
    when [...] carpenters demanded a 72-hour week." -- Anatole Beck