Originally Posted by
Capn Bloggs
No it doesn't. If the aeroplane is bumped off the 3° path for some reason, it won't go back to it, it will simply re-set the flight path to 3°. The report describes this issue on page 65 and is something that any Airbus or Boeing driver should understand...
This should be the highlight of the whole topic here. Misunderstanding of the automation. People think because they do a nice LOC/FPA approach during their type rating with ISA conditions in still air in the sim FPA is great, set -3.0 degrees and pull 0.3 nm before FAF and that's it. Yep, unless it's -30C or +45C and bumpy as hell.
The only half bullet-proof tool for NPA is a VNAV coupled approach, with all the altitudes corrected for cold temperature.
And even then, one should crosscheck with DME table until visual or there's no more entries in the table.