There have been a number of accidents over the last few years where the autopilot has been used below minimums on a non precision approach. The Turkish airlines crash in Nepal is a classic example. If the pilots had been flying manually, they would probably have been forced to recognise sooner that they did not have enough visual reference to land safely. This is where the over reliance on automation bites. I fly quite a number of non precision approaches using vnav lnav and in good weather it can be startling how far off the papis and extended centreline the aircraft can be just above mdh. We get lulled into a false sense of security by the reliability of the autopilot. The only positive aspect seems to be that in the Air Canada and Turkish cases at least, the aircraft crashed onto the airfield with not too many casualties.