 No. 5 OTU had thirty crews under training in January 1945 , compared to a dozen in November 1942 . By this time its complement of aircraft had increased to seventy @-@ five , including twenty @-@ eight Mosquitos . Staffing reached its highest level of 1 @,@ 700 personnel in May . Ace Charles Crombie was the unit 's chief flying instructor when he was killed in a Beaufighter crash at Williamtown on 26 August 1945 . One of his fellow instructors at the time was Flight Lieutenant Charles " Bud " Tingwell . Leading Aircraftman Jack Brabham , then an engine mechanic at No. 5 OTU , witnessed the accident . The end of hostilities in the Pacific saw the dissolution of all the RAAF 's OTUs . On 1 February 1946 , No. 5 OTU was reorganised as a crew conversion unit , CCU ( Fighter ) , operating North American P @-@ 51 Mustangs and CAC Wirraways . By February 1947 the CCU had a complement of twenty @-@ eight aircraft and just under a hundred personnel . Activity began winding down in May , and the unit was disbanded on 7 July 1947 . 
