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En route from Rakkestad (ENRK) to Kvernberget (ENKB), after passing Kjeller (ENKJ), the commander registered problems with the engine and loss of oil pressure. He attempted to return to Kjeller, but the engine seized, and he had to perform an emergency landing in a field just short of the airfield. The landing was made with the landing gear retracted. There was substantial damage to the aeroplane. The commander, who was alone on board, escaped injury.

The engine seizure occurred because practically all oil was lost in-flight. The SHT has despite thorough technical examinations not been able to determine  how the engine oil was lost. Normally, it is not probable that such a great amount of oil is ventilated through the crancase breather line. In spite of this, loss of all the engine oil through the crankcase ventilation  seems to be the only possibility in this case.

This report is in Norwegian only. No safety recommendation is issued in connection with this investigation.


Location Nittedal in Akershus
Occurrence date 30.04.2011
Aircraft Mooney M20
Operator Private
Registration LN-ABP
Meteorological conditions VMC
County Akershus
Type of occurrence Accident
Type of operation Private
Category of operation Light, aeroplane (< 5 700kg)
Aircraft category Landplane, Single-engine, Piston engine



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