NTSB Identification: SEA91LA231.
The docket is stored on NTSB microfiche number 44478.
Accident occurred Monday, September 02, 1991 in CORVALLIS, OR
Probable Cause Approval Date: 07/13/1993
Aircraft: CESSNA 310F, registration: N6788X
Injuries: 1 Uninjured.

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

IMMEDIATELY FOLLOWING TAKEOFF THE PILOT EXPERIENCED A LOSS OF CLIMB PERFORMANCE AND WAS UNABLE TO DETERMINE WHICH ENGINE WAS AFFECTED. HE CHOSE TO RETURN TO THE AIRPORT AND THEN EXECUTED A 180 DEGREE TURN BACK TO THE AIRPORT. UNABLE TO MAINTAIN ALTITUDE HE EXECUTED A FORCED LANDING IN AN OPEN FIELD AND THE RIGHT MAIN LANDING GEAR SEPARATED AS THE AIRCRAFT CROSSED A DITCH. SUBSEQUENT TEST RUN OF THE LEFT ENGINE REVEALED A DISCONNECTED AIR INDUCTION LINE WITH DEGRADED PERFORMANCE ABOVE 60% POWER. THE RIGHT ENGINE PROPELLER BLADES EXHIBITED AFTWARD TIP CURL AND POLISHING. THE PILOT REPORTED ONLY 35 HOURS OF TOTAL MULTI-ENGINE FLIGHT TIME OF WHICH ONLY 3 HOURS WERE IN THE CESSNA 310 AND NO CESSNA 310 FLIGHT TIME WITHIN THE PREVIOUS 90 DAYS.

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

A DISCONNECTED AIR INDUCTION LINE, AND THE PILOT'S INFLIGHT DECISION TO EXECUTE A 180 DEGREE TURN BACK TO THE AIRPORT. HIS LACK OF EXPERIENCE IN MULTI-ENGINE AIRCRAFT, HIS OVERALL LACK OF FAMILIARITY AND LACK OF RECENT EXPERIENCE IN THE TYPE AIRCRAFT WERE FACTORS IN THE ACCIDENT.

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