NTSB Identification: FTW84LA212.
The docket is stored on NTSB microfiche number 25204.
Accident occurred Tuesday, April 24, 1984 in SAN ANTONIO, TX
Aircraft: CESSNA 150M, registration: N45387
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.

WHILE RETURNING TO ARPT THE PILOT EXPERIENCED A ROUGH RUNNING ENG WITH A DROP IN RPM. THERE WAS INSUFFICIENT POWER TO MAINTAIN FLT AND AN EMERGENCY LANDING WAS MADE ON A HIGHWAY. THE ACFT WAS DAMAGED DURING THE HARD LANDING. AN EXAM OF THE ENG REVEALED THAT THE #1 ROD ASSEMBLY HAD FAILED. THERE WAS EVIDENCE OF HIGH OIL CONSUMPTION. ONLY ABOUT 1 PINT OF OIL WAS FOUND REMAINING. THE 2ND RING ON PISTONS 2, 3 & 4 WERE OIL SCRAPER RINGS. THE 1ST AND 2ND RINGS ON EACH PISTON SHOULD HAVE BEEN COMPRESSION RINGS. ALSO, THERE WAS EVIDENCE OF OVERHEATING & THE #2, #3 & #4 ROD TO CRANKSHAFT BEARINGS WERE PITTED & GALLED.

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

ENGINE ASSEMBLY,RING..IMPROPER

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

MAINTENANCE,INSTALLATION..IMPROPER..OTHER MAINTENANCE PERSONNEL

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

FLUID,OIL..STARVATION

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

ENGINE ASSEMBLY,CONNECTING ROD..FAILURE,TOTAL


Contributing Factors

LIGHT CONDITION..NIGHT

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