Thank you tucumseh.
Just a clarification ... 'basic airmanship'? yes, the query was re. Safety Altitude both here and at Erebus. Re. the BOI's conclusions on the crew culpability, it seems the SOs considered that only the pilots had any responsibility for the safe conduct of the flight - an assumption both arrogant and dangerous.
While the Chinook was the one rotary of which I had no personal experience, I did have experience of the fatal results of failure on the part of 'authority' to deal with an aircraft 'discrepancy' . It is not an experience which should be allowed to pass unquestioned !