Came across your thread re:ATCO Alfa owner Mt Hagen early 70's, I purchased the vehicle new in Hagen 1970 (impetious youth), spent most of it's life under our house there, used it for regular Runway inspections
once the road to Kagamuga was sealed. RAAF flew it to MADANG in a Herc when I was transferred in 1972 (cost a carton of SP per crew), returned to Oz by ship in '74. I remember Gary Honour had one in Lae at the time. Interesting forum chaps, came across your link searching for DHC6 accidents post 70's.