On Sun, 11 Jul 2004 19:55:36 -0400, MichaelR wrote:

They don't. They turn them on during descent because otherwise they would
still be cold enough to be fragile even after getting down into warmer air.

My company's procedure for the 737 is to turn on the window heat a
minimum of ten minutes prior to takeoff and leave it on until parked at
the arrival gate. The window heat can be left all day long if desired.

-Jack Davis
B737


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