Quotes above come from Boeing. Pretty sure it's reliable.
Originally Posted by
Capn Bloggs
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.
Why care how close they are to eachother? Calibration and vertical positioning change everything. You might as well put a PAPI on a building next to the threshold, it will work fine if calibrated correctly. The PAPI provides a 62ft clearance according to the AIP, +/- 30ft to the wheels according to your document, giving a good 30ft clearance. I don't see the issue with the PAPI.
If you're low, you're low. You're not supposed to think you're fine. If you are "on" the PAPI, you will be fine. From the minima I have never heard anybody say you should "ride" the PAPI's to the ground. It's a visual maneuver with aiming point in the touchdown zone.