Rockwell Commander 114 Commander, G-BDYD
The aircraft suffered an in-flight engine failure as a result of a total oil loss; the subsequent forced landing was made into a cultivated field, but the aircraft failed to stop before encountering a ditch and hedge at its far end. The aircraft was damaged substantially as it came to an abrupt halt. The oil loss was caused by the failure of a gasket on the oil filter converter plate, mounted on the rear of the engine. The gasket was the subject of an Airworthiness Directive (AD) that required gasket renewal at 50 hour intervals. This requirement was terminated when an improved design of gasket was fitted. The aircraft’s maintenance records indicated periodic replacement of the gasket for a time following the issue of the AD. However, the aircraft was subsequently transferred to a different maintenance organisation, which concluded that the new type of gasket had been fitted and that the AD was no longer applicable.