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7th November 2001 | 23:10

#9 (permalink)

quid

still learning....

Joined: Jul 1999

Posts: 169

Likes: 0

From: USA

fb1,

Beg to differ. Take the first 2 digits if the FL, double, then subtract 15. At FL 310 it would be 31 X 2=62. Then subtract 15 to yeild an ISA of -47 at FL 310.

ISA is always SAT, never RAT.