"zatatime" wrote in message
...
On Sun, 10 Oct 2004 20:37:11 +0000 (UTC),
(Paul Tomblin) wrote:

I'm trying to figure out the BAF ILS 23 localizer approach. The normal
LOC 23 approach has a MDA of 900, and the LOC 23/DME approach has a MDA of
700 feet. After the FAF, there is a step down fix at 2.7 DME with a
_1160_ before it. So does this mean that if you don't have DME, you can
descend to 900 immediately after the FAF, but if you do have DME you can
only descend to 1160 until 2.7 DME? Why is it safe to descend to 900 in
one case, but only 1160 in the other?

I may be completely wrong on this, but I think the 1160 is a step down
for both types. As I see it if you have DME you can proceed lower (to
700) at the 2.7 mile mark, otherwise the radar facility will call the
2.7 mile position for you at which time you can proceed lower to 900.

That's how I read it too. An MDA doesn't override a prior minimum altitude.
Without radar, there's no way to descend below 1160' (except visually).

Cool example--thanks for posting it, Paul!

--Gary