NTSB Identification: FTW90LA139.
The docket is stored on NTSB microfiche number 42721.
Accident occurred Wednesday, July 11, 1990 in DENTON, TX
Probable Cause Approval Date: 11/09/1992
Aircraft: BELLANCA 17-31ATC, registration: N39870
Injuries: 2 Serious.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

THE AIRPLANE WAS DEPARTING THE AIRPORT FOR A CROSS COUNTRY FLIGHT WHEN A PARTIAL POWER LOSS OCCURRED. THE PILOT DECIDED TO RETURN TO THE AIRPORT. A TOTAL POWER LOSS OCCURRED AND A FORCED LANDING RESULTED. DURING THE EMERGENCY DESCENT, THE AIRPLANE COLLIDED WITH TREES AND A UTILITY POLE. THE AIRPLANE DESCENDED UNCONTROLLED TO IMPACT THE TERRAIN. THE LOSS OF POWER WAS DUE TO THE IMPROPER INSTALLATION OF A OIL LINE BY THE PILOT DURING AN OIL CHANGE THAT HE PERFORMED. THE ENGINE OIL WAS EXHAUSTED FROM THE SYSTEM WHEN IT WAS PRESSURIZED.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

THE PILOT FAILURES TO PROPERLY IN STALL A OIL LINE WHICH RESULTED IN A COMPLETE LOSS OF ENGINE POWER AFTER THE OIL SUPPLY WAS EXHAUSTED.

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