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25th Jan 2012, 11:40

#9 (permalink)

JIC

Join Date: Sep 2004

Location: Europe

Posts: 59

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Simply because of the MACH formula.

MACH = TAS/ LSS

Tas increases with altitude
LLS ( local speed of sound) decreases with falling temp. And temp usally falls with inceasing altitude.

Cheers.

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