Looks very similar to Sundeland crashes about 60 years ago (hit high ground in bad weather).
If you are in a Chinook with full IF gear there is no way that you should be grovelling around with a full load of passengers aboard.
Imagine, just above you, flying into Prestwick in an aeroplane are a couple of pilots in shirt sleeves and 300 passengers going to the airport. Mr RAF has enough nav equipment to take him to the same destination, but decides to travel visual.
The basic thing here is airmanship, and I really think that despite any supposedly engine problems, you must look at basics and wonder why passengers were subject to pilots not seeing where they were going.