Bob Moore writes:

Of course these jet windshields are heated to provide the middle layer
of plastic with some flexibility to resist shattering in case of a bird
strike at low temps. Should the heating system be turned off and cold-
soaking occur(electrical bus turned off for trouble-shooting perhaps),
Boeing had a procedure for re-heating the windshield at very low temps
to prevent thermal shock from cracking the glass layers. This involved
cycling the power switches ON-OFF at one minute intervals for several
minutes. Sounds to me as if the temps at DEN were quite low and the flight
crews just turned the windshield heat ON and forgot about it.

Just one possibility of course.....

It sounds logical. Many models of aircraft were affected, though (and in fact
Boeing wasn't mentioned--if a Boeing windshield cracks, there's a _real_
problem). Mostly those Brazilian planes and some others. Most were on the
ground, not in the air.

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