I too am surprised no one has mentioned the infamous Lockheed P3B Orion that was acquired by the RAAF, an ex flying testbed, as a replacement airframe for the brand new P3B that crashed at the Moffat Field US Navy base back in 1968, during its acceptance flights. It crash landed while attempting a touch-and-go and the port side MLG axle/brakes and wheels separated, and in doing so severely damaged the underside of the wing, it ground-looped and stopped still on the runway and was destroyed by fire, everybody escaped. (It was later found to be a OEM fault with the MLG oleo strut, hence the replacement airframe).
It was an older airframe in every way, and for it's entire career with the RAAF, it never flew straight, though the problem was investigated several times!
It was the infamous 154605.