My father (now no longer with us) was Chief Flight Engineer Inspector with ICAO attached to the Bangladesh CAA and Biman in the mid 80's. He was involved with the B707 and Dc10. I do remember a number of the recollections he had of his experiences with Biman. He wrote a book about his career in aviation and there is a chapter on his time with Biman which is most enlightenining.
Temps,