NTSB Identification: LAX90LA035.
The docket is stored on NTSB microfiche number 42164.
Accident occurred Friday, November 17, 1989 in VAN NUYS, CA
Probable Cause Approval Date: 07/22/1992
Aircraft: CESSNA 177RG, registration: N2069Q
Injuries: 1 Serious,1 Minor.

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

NEAR THE END OF THE FIRST FLIGHT FOLLOWING INSTALLATION OF AN OVERHAULED ENGINE, THE ENGINE SIEZED AFTER THE PILOT NOTICED A RAPID DROP IN OIL PRESSURE. AFTER THE ACCIDENT, THE LEFT SIDE LOWER EXTERIOR FUSELAGE WAS FOUND TO BE COVERED WITH FRESH OIL, WITH THE OIL SMEAR ORIGINATING NEAR THE OIL BREATHER LINE. THE ENGINE COWL BAFFLE SEALS WERE FOUND INSTALLED INCORRECTLY. LESS THAN 1 QUART OF OIL WAS FOUND IN THE ENGINE SUMP. ON THE EXTERNAL REAR SIDES OF THE #3 & #4 CYLINDER BARRELS, AN OVAL AREA OF HEAT DISTRESS WAS NOTED. THE CRANKSHAFT & PISTON RODS EXHIBITED PROGRESSIVE HEAT DISTRESS ON ALL ROD BEARINGS AND CRANKSHAFT JOURNALS, WITH THE #1 ROD EXHIBITING THE LEAST HEAT SIGNATURES & THE #4 THE MOST SEVERE. THE #3 ROD CAP WAS FOUND LOOSE IN THE ENGINE; EXAMINATION OF THE CAP BOLTS REVEALED SEVERE NECKING SIGNATURES AT THE POINT OF TENSION FAILURE. A MICROMETER WAS USED TO MEASURE THE CYLINDER BARRELS FOR ROUNDNESS. THE #3 CYL WAS FOUND TO BE OUTSIDE THE FACTORY SPEC BY .002 INCHES.

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

THE INCORRECT INSTALLATION OF THE ENGINE COWL AND BAFFLE SEALS DURING THE INSTALLATION OF THE ENGINE FOLLOWING AN OVERHAUL.

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