Re: Airliner Windows

Date:         11 Sep 97 03:35:32 
From: (Don Stokes)
Organization: Daedalus Consulting
References:   1 2 3 4
Followups:    1
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Marc Schaeffer  <> wrote:
>The Comet 1 crashes you relate to (especially YP) occured because of
>metal fatigue which started at the rear A.D.F aerial hatches which was
>located in the upper part of the fuselage. The fatigue started at the
>corner of this window. As a consequence the center fuselage splitted
>along the top center line. The pressure differential you relate to was
>therefore pretty obvious ...

YP (Elba) was found to have failed at an upper navigation window.  YU, the
aircraft stressed in the test tank at Farnborough, failed at the forward
escape hatch window.  YY went down in deep water and was not able to be
adequately investigated.  The problem there was not any particular window,
but the fact the windows were square and the fuselage skin too thin.

Of the other Comet 1 crashes, two were on takeoff, where the problem was
found to be inadequate airspeed on takeoff (pilots were subsequently
required to gain more speed before rotation) and a crash at Calcutta in
a thuderstorm -- although in hindsight that may too have been caused by
a fatigued fuselage.

-- don