Originally Posted by
Denti
Completely different case though, the ILS is a fixed geometric path in space, the VNAV approach is not. And if you, in direct breach of the relevant AMC, adjust your DA, you put it quite a bit farther away from the runway, whereas an adjusted DA on an ILS simply puts it where it should be anyway. And yes, the DA is taken into account for the minimum temperature of the procedure, in fact it is one major point there, choose a higher temperature and you can accept a lower DA, chose a lower temperature and you have to choose a higher one.
The source of path is irrelevant, ILS or VNAV, the regulations require you to initiate a go around if not visual with the runway at a given altitude, and this altitude needs to be corrected for cold temperature.
This applies to any type of approach.