"Chris Brooks" wrote in message
...

Also, if he said cross HAIGS at or above 4,000 feet, is that a
clearence
to
descend to 4,000 feet?

Yes.

Can you provide a reference for that fact?

What's the alternative? What else could you do? That clearance is
essentially a pilots discretion descent. All you gotta do is make the
crossing restriction which in this case is an at or above altitude. Most
pilots in this situation would just stay at your previous altitude until
intercepting the glideslope, then follow it down.


So if that is the case, when can
the descent be initiated?

Right now if you want.

Pilots discretion?

Yes.