Do different planes (categories A through D) aim differently in the final stages before flaring? I'm asking about precision runways.
The reasons I ask:
- An ILS' glide slope is not coincident with the PAPI for example (when does the shift from G/S to PAPI occur?)
- There may be differences in the touchdown zone markings
- Airplanes come in different cockpit heights and approach speeds.
By 'final stages before flaring', I mean when the landing is manually flown in VMC, when the shift from looking down to up occurs.
- Example: you may be on the G/S but off the PAPI when you look up, which one do you follow based on the category?
There is plenty of anecdotal information all over the internet, so I'm looking for as factual an answer(s) as possible based on experience. This post for example (pprune.org) offers contradicting advice, one quotes a document saying, "PAPI provides guidance down to flare initiation," and mostly others saying to ignore the PAPI.