The descent was co-ordinated with local radar, as confirmed by the CVR.
Was it??? the radar operator only had VHF comms, at no time was VHF contact established with McMurdo, at no time was a DME lockon achieved.
Please quote any contact with McMurdo radar on the CVR?
What's your point?
My point being, the company order which states "the only let down procedure available". I would have thought that was not ambiguous in any way, to the best of my knowledge "only" has only one meaning.
Nowhere does it state that if you feel like it, and the weather is below our requirements, and the local wx people advise no good for sightseeing, then you can dream up your own descent procedure, using a Nav Aid not cleared for ops below MSA, never having sighted a 12,000ft odd mountain that you know is very close, and crash into that mountain, then, according to Mahon's interpretation of the facts you "have committed no error".