For those of you curious about how a UPS A300 flies the LOC18 and RNAV18 into KBHM, here's a pretty detailed answer. From a UPS A300 F.O. -
"The FMS generates a VNAV angle that meets all of the intervening fix restrictions and a TCH of 50'. Thus the CDA versus a dive and drive....so, mins treated like a DA (H) versus the old school MDA hope you pick up the lights by the MAP.
For the LOC-FMS will generate a 3.28 CDA to comply with the FAF altitude of 2300' at BASKN and the 1380' crossing restriction at IMTOY. (looking at the plate, looks like the 910' hill is just past IMTOY so perfect world should have crossed the hill in the 400' AGL ball park)
RNAV (GPS) has a slightly different CDA (3.24)-no clue why, same points but may get to smooth it a bit for IMTOY versus the old school crossing restriction.
GPWS callouts were reportedly for Sink Rate, versus a terrain warning.
Have to remember that kind of expected to land once you get close to the airport and the Terrain warnings are inhibited".