-8AS; I have never come across a PAPI at a major western airport which significantly differed from the glideslope. Of course the larger the aeroplane, the more the eye height will be above the antenna (by the gear) - this is probably the discrepancy you perceive.
Also, I have never seen anyone use the backcourse of an ILS on a modern a/c - there is so much else available for use (eg extend the centreline, beacon, looking out of the window!) The only caveat would be circling from an ILS appr and the briefing should include inhibiting G/S warnings on the downwind, and (re the former point) maybe your military field example, but if the PAPIs are set at 2.5 deg, then following the glideslope would be my preference, rather than duck down at DH to catch and follow the lower profile.
Not least, IMHO it is bad practice to have a GPWS warning blaring continuously without doing anything about it. You obviously think differently, but I disagree.
Last edited by Joe le Taxi; 7th June 2006 at 16:21.