Without inferring anything specific in relation to this accident, I'll repeat something I've posted before: descent below MSA in IMC whilst not on a published approach procedure has killed a lot of pilots, some highly experienced.
Wise words indeed!
I wonder if the Benson ILS was radiating at the time? If so, it could have guided the aircraft to a point overhead Chalgrove at about 1000ft agl.
I too am very familiar with the area, having lived there for many years before moving to France. I agree with the remarks of others about fog, orographic cloud, etc.
I remember a Cessna 182 crashed in a nearby location in the 1990s on the way to Booker. Bad weather was, I believe, a factor.
Very sad.
