Best Summary Yet
I am coming late to the detail of this thread and this may have been aired before.
There is a very good summary of the accident, the various enquiries and investigations and a postulation of the cause, in a book called "Chinook Crash" by Steuart Campbell.
I realise that the views of both the supporters and opponents of the official line are probably too polarised now but, nonetheless, I found the book extremely well written and objectively presented. I have recommeded it to many people who have asked me about the accident and my copy has been loaned out more times than I care to remember.