Originally Posted by
Peter Geldard
i cannot conceivably understand how two well experienced and qualified pilots would ignore such warnings if they appeared..
Having been in a similar situation myself, this can happen when the PIC is skimming the cloud base from below, in hope of slipping through a narrow gap between the clouds and a valley somewhere.
In that case, pilots ignore terrain warnings since they have ground contact below them. I ignored my GNS430 for sure.
At the same time, it is still possible that the forward vision is unexpectedly obscured by low hanging cloud fractus and with a rising terrain, this can quikcly become a death trap.
To avoid people attempting to scud run in mountenous areas, EASA has invendent some kind of en-route instrument rating (EIR), to allow flights to take IFR route segments, above or inside clouds, but depart and land only under VFR. But I am not sure it is widespread in the member states.