Reference the incident today when a Ryanair plane depressurised and
had to make an emergency landing at Lemoge, can any of the experts on
this group say why planes depressurise spontaneously at 30,000 feet?

Presumably if a door flies open, or a window blows out, this could
happen but what is the most common cause?

-- 
Alasdair.

In message 
          Alasdair  wrote:

> Reference the incident today when a Ryanair plane depressurised and
> had to make an emergency landing at Lemoge, can any of the experts on
> this group say why planes depressurise spontaneously at 30,000 feet?
> 
> Presumably if a door flies open, or a window blows out, this could
> happen but what is the most common cause?
> 

Don't know if there are enough such incidents to refer to a common cause, but
some form of mechanical failure is the most likely, or possibly a bird
strike.  There doesn't seem to have been an explosive decompression from the
reports I've seen on the news pages which would suggest a relatively slow
leak through a small puncture.

-- 
Graeme Wall
This address is not read, substitute trains for rail.
Transport Miscellany at <http://www.greywall.demon.co.uk/rail/index.html>