Question on the constant 3 degree descent slope to MAP in uneven terrain:
How do you set it up when the PAPI slope is significantly steeper as at ZRH?
Either
1: you get a steep descent from the FAF crossing altitude after flying level to the top of descent or
2: you increase your rod upon acquiring the PAPI and destabilize.
Missed approach in case 1: would require a DA significantly higher than the MDA because of the steeper descent path; also, a verification that climb would begin by the MAP where terrain clearance is tight.
No big problem either way in an Aztec with both engines; how about a 777? Perhaps certain NPAs should be restricted to suitable a/c types.