CEDAR HILL, TX, USA
N46RJ
Hiller UH-12E
DURING THE INITIAL NIGHT FLIGHT AFTER AN OIL CHANGE & ANNUAL INSPECTION, THE HELICOPTER EXPERIENCED A TOTAL POWER PLANT FAILURE. AN AUTOROTATION WAS PERFORMED & THE HELICOPTER STRUCK A BUILDING PRIOR TO COMING TO REST. INSPECTION OF THE WRECKAGE REVEALED ENGINE FAILURE WAS A RESULT OF OIL STARVATION. INVESTIGATION REVEALED THE OIL SYSTEM HAD BEEN ADEQUATELY SERVICED, HOWEVER, THE DRAIN VALVE HAD NOT BEEN CLOSED & UPON ENGINE START AND TAKEOFF THE OIL WAS PUMPED OVERBOARD.
Source: NTSB Aviation Accident Database
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