Plane was Lockheed L-414 Hudson on a night flight practice. The aircraft was on wireless silence and failed to return to base. The maximum endurence of the aircraft was 7 hours. Five crew were lost. Crew were - P/O John James Bowman, pilot, P/O Alan Joseph Malone, navigator, P/O Harry Robert Alfred Guymer, wireless operator and air gunner, P/O Alexander Frederick McDonald, wireless operator and air gunner, P/O John Alexander Buchanan, air gunner.