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Gentlemen,  
In regards to the current, and I believe VERY PRUDENT, concern over
emergencey egress in case of a incident induced Lock In,...The idea of
the ice axe is great IF you have an adequate area in which to generate a
forcefull swing.

As an alternative that doesn't require any swinging area, I seem to
recall that some of the Fire and Rescue people had an impact tool years
ago that was essentially a spring loaded center punch "on steroids".

This tool was held against the glass of the vehicle in which the victims
were entrapped and cycled.  The hardened point of the tool was
compressed against the spring pressure as the tool was compressed, and
was "snap" released when the max compression was reached.  Did a nice
job as I remember.  

While I'm not sure if still available or if it will work on plexiglass,
it may be worth persuing. I believe the US Military either tried this or
actually issued something like this at one point.  Any contributions
from our(ex or current) military flyers?

Regards for safe flight to all.  (Remember the "Seven P's"...and you'll
usually come home safely).    Jeffrey B. Chipetine

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