Nils Meier writes:

 > Example IOW 109.5 localizer in Ottawa - approach
 > in the 'right' direction 70 works as expected.
 > In an approach in opposite direction the needle
 > works as if the localizer was setup for 25.

Yesterday, I was flying a simulated BC approach to exactly the same
runway -- CYOW rwy 25 -- and I couldn't find it and ended up
overshooting.  That's good practice in itself, but I was still pissed
off that I couldn't find it.  Your posting reminded me why.

 > Is that a known fact (or do I need a refresher in instrument
 > flying)? :)

You're right and FlightGear is wrong.

First, Robin Peel's database omitted the localizer for 25.  I had
started to rough it in a long time ago but never finished.  As a
result, I'm amazed that you were able to do any ILS approach at all to
7/25.  That's my mess, and I've fixed it by checking in a new
default.ils.gz (I still need to clean up the other ILS).

The rest of the mess is FlightGear's.  There are a few large airports
that use paired ILS transmitters on the same frequency: someone added
some code a few months ago to support those few runways and broke
hundreds or thousands of regular BC approaches.  I had understood that
the problem was fixed and had forgotten about it, but your posting
reminded me.  I can confirm that the problem is still there, and I
will look into it.


All the best,


David

-- 
David Megginson, [EMAIL PROTECTED], http://www.megginson.com/

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