"Michael" wrote in message
oups.com...
Legally, the GS intercept at published altitude, nothing else,
identifies the FAF on an ILS.

Yes, you're right (I was conflating the ILS FAF with the LOC FAF that would
be used to check the altimeter on an ILS approach).

There is no requirement to check the
altimetry or anything else. Of course if it's not a big deal to do so,
the prudent pilot will. A VFR GPS makes a fine check without adding
workload. I would suggest that this is good enough, and there's no
reason to make things more difficult by flying the LOC inbound by dead
reckoning while checking the cross fix if you don't have to.

Ok, that sounds reasonable.

--Gary