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LDA with straight in minimums?

Old 08-06-2011, 12:12 PM
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Default LDA with straight in minimums?

Pretty much referring to the ROSSLYN LDA in to DCA. Why does the chart still have straight in minimums if its considered a circle app? As far as I know, more than 30 degrees is considered circling...
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Old 08-06-2011, 12:26 PM
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My guess is that because the approach is to a specific runway it has straight in minima published. But the minimums are the same as circling.

I would be curious to know this also.
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Old 08-06-2011, 01:42 PM
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Unless there is an obscure TERPS Manual exception, the only explanation I can give is that IT'S KDCA AND THE FAA CAN DO WHAT WANTS. The LDA 19 is outside of 30 degrees, as is the ROSSLYN, the course does cross the extended centerline but the ROSSLYN doesn't; the descent gradient is less than 400 ft/nm. They both should be circling only because of the course guidance outside of 30 degrees of runway centerline.

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Old 08-06-2011, 02:23 PM
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Here are some more examples that makes me think my original theory might be correct:
LDA-H has no straight in.
http://www.airnav.com/depart?http://...06213LDADH.PDF
LDA/DME RWY11 has straight it.
http://www.airnav.com/depart?http://...5414LDAD11.PDF
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Old 08-06-2011, 03:03 PM
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Why the heck is it called ROSSLYN LDA? I thought if there were two (or more) approaches to the same runway with the same nav equipment they just named the Z, Y, X etc.
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Old 08-06-2011, 03:39 PM
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ASpilt2be

The Valdez approach is a circle because the gradient on final is greater than 400 ft/nm, where the gradient is less than that at Juneau.

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Old 08-06-2011, 03:42 PM
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Originally Posted by galaxy flyer View Post
ASpilt2be

The Valdez approach is a circle because the gradient on final is greater than 400 ft/nm, where the gradient is less than that at Juneau.

GF
Interesting. Thanks.

I just got the IR the other day, so I am still learning these things.
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Old 08-06-2011, 07:01 PM
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Originally Posted by galaxy flyer View Post
Unless there is an obscure TERPS Manual exception, the only explanation I can give is that IT'S KDCA AND THE FAA CAN DO WHAT WANTS. The LDA 19 is outside of 30 degrees, as is the ROSSLYN, the course does cross the extended centerline but the ROSSLYN doesn't; the descent gradient is less than 400 ft/nm. They both should be circling only because of the course guidance outside of 30 degrees of runway centerline.

GF
Thanks for the info..
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Old 08-06-2011, 11:06 PM
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It's been a very long time since I had to think about this but I seem to remember from my cfi days that for an approach to have straight in mins it had to satisfy 3 requirements;

A "normal" or approx 3 degree final approach angle.

The final approach path had to cross the approach end of the designated runway..

Final approach course within 30 dgrees of the runway center line.

I think it was somewhere in the Terps.
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Old 08-07-2011, 08:04 PM
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The localizer is on the naval airbase across the river...that might have something to do with it?
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