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Old 4th July 2008, 21:12   #8 (permalink)
IO540
A Personal Title
 
Join Date: Jun 2003
Location: England
Posts: 9,737
I too think the Q has various subtle angles to do with 'popup IFR clearances' more than with the weather prevailing when you are going down the ILS.

In practice, one will get away with non FM Immune avionics every time, IMHO.
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