"Gary L. Drescher" wrote:

"Greg Esres" wrote in message
...
Is it well-defined where the approach segment begins when you're
vectored for SHN NDB-A?

Yes, in theory. ;-) You're on the final approach segment where the
initial segment intersects the final approach course at (or within)
the 10 nm limit stated in the chart.

I see why it's a sensible practice to construe it that way, but is it
officially defined that way somewhere?



On the FAR Part 97 form for the approach. It says "remain within 10
miles." Where there is no segment prior to that, the procedure turn
initial approach segment begins at 10 miles from the PT fix. If normally
ends at that limit, but when vectored to "final" it begins at that
point. Same published-segment airspace boundary in either case.