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Brent,  Thanks for your detailed comments on how the cabin pressure
differential remains the same at all altitudes.  I mistakenly thought that
the differential must change at different altitudes because of the blow out
accidents.  Do you have any thoughts on why 22-23,000' seems to be a
critical atlitude for this to happen in at least two instances I know of?
John

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Please send your photos and drawings to marvkaye@olsusa.com.