On 09/15/09 20:17, I wrote:

> Of the 3050 ILSs in section four of my copy of nav.dat,
> 404 of them, i.e. more than 13% of them, are reversible.

FWIW if we restrict attention to US airports, i.e. 
having ICAO identifiers of the form K..., then 276
of the ILSs are reversible i.e. more than 23% of 
the 1172 total ILSs.  That's 138 pairs if you want 
to count by pairs.

The higher percentage stands to reason, given the 
high density of airports and air traffic in the US,
and the paucity of available ILS frequencies.

Bottom line:  These critters are not rare.  

Getting FGFS to handle them properly is worth a bit 
of effort.


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