PPRuNe Forums - View Single Post - Mode A code change on Approach (B747-400). Why?
Old 24th December 2006 | 23:27
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punkalouver
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In case there are still any doubters about whether Mode S is necessary.
http://techaidproducts.com/PDFs/TCASUncovered.pdf

TCAS is what gave mode S its biggest boost.
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