Airbus VNAV is the biggest crap. Far too conservative. Gets you down low and slow, and very often outside controlled airspace. The aircraft can actually descend steeper than the VNAV calculates. This results in the low and slow profile as it calculates too conservatively. You either end up descending much slower than desired to keep idle thrust otherwise you will need to maintain some thrust during the entire descent to hold the speed and profile. Just crap I say. Definitely not great. And yes I do put all the necessary data in but it just does not work.
Last edited by John Citizen; 27th Apr 2013 at 15:52.