From
Boeing:
737-800 Eye height above wheel path: 17.1ft, giving a wheels over the threshold on 22 of 31ft, touchdown at 177m (no flare).
777-300 Eye height above wheel path: 33.5ft, giving a wheels over the threshold on 22 of 15ft, touchdown at 81m in (no flare). On the ILS, you're a little better off, with a wheel crossing height of 27ft and a no-flare touchdown point of 155m.
Originally Posted by
BraceBrace
The PAPI's are perfectly safe to be used by any 777 "2 reds, 2 whites", whatever the body length, because the touchdown point is not the same as for a glideslope. They will guide an aircraft further along down the runway.
Theoretically, but in this case, the PAPI and the ILS are within 20m of each other, so they don't. One would happily fly down the 2W2R PAPI thinking "she'll be right' when in fact, if you go just a tad low for whatever reason, you're going to be very very close to scraping the keys.