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29th January 2002 | 08:54

#6 (permalink)

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Joined: Aug 1998

: ATPL

Posts: 6,623

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From: Ex-pat Aussie in the UK

At a guess, I would say that, as fair proportion of cloud at altitude is made up from ice crystals, the sound is from the ice crystals rushing past the cockpit.

Like sands through the hourglass....