"David Rind" wrote in message
...

If an approach has a hold in lieu of a PT, but the chart says
"No PT", is the hold optional, or is it only available with ATC
authorization the way a PT would be in this situation?


ATC authorization is required.



I was looking at the ILS 2 approach into EEN, and there is a
segment at 4000' from an IAF at the GDM VOR marked No PT.
The intercept altitude for the ILS is 2600', which is a fairly
quick descent along the localizer (though certainly doable).


Fairly quick descent? If your clearance is via GDM and you've been cleared
for the approach, you can descend to 4000 once you reach GDM. If you reach
4000 by CAHOW, you'll find yourself about 240 feet BELOW the glideslope as
you join the localizer.



If you wanted to take a turn around the hold to descend, do
you need ATC authorization the way you would for a PT?


Yes.



I can't tell from the wording in the AIM though perhaps I'm missing the
place where it is spelled out.


§ 91.175 Takeoff and landing under IFR.

(j) Limitation on procedure turns. In the case of a radar vector to a final
approach course or fix, a timed approach from a holding fix, or an approach
for which the procedure specifies "No PT," no pilot may make a procedure
turn unless cleared to do so by ATC.