NTSB Identification: MIA84LA028.
The docket is stored on NTSB microfiche number 22930.
Nonscheduled 14 CFR
Accident occurred Thursday, November 10, 1983 in OKEECHOBEE, FL
Aircraft: GRUMMAN AMERICAN AA-5B, registration: N123EF
Injuries: 2 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.

THE PLT REPORTED THAT DURING FLT, THE ENG HAD A PARTIAL LOSS OF POWER. HE ATTEMPTED TO DIVERT TO AN ARPT. HE WAS ABLE TO GET ON FINAL APCH, BUT WHEN HE SAW HE COULD NOT REACH THE RUNWAY, HE TURNED AWAY FROM THE LIGHTS & A BUILDING FOR AN EMERGENCY LANDING. HOWEVER, BEFORE LANDING, THE ACFT COLLIDED WITH POWER LINES, THEN IMPACTED THE GROUND. AN EXAM OF THE ENG REVEALED THAT THE EXHAUST VALVE HEAD OF THE #1 CYLINDER HAD SEPARATED. WITH CONTINUED OPERATION OF THE ENG, DEBRIS ENTERED THE #1 CYLINDER CAUSING FURTHER DAMAGE & LOSS OF POWER. THE SODIUM COOLED EXHAUST VALVE, PN 74541 AH-ED, HAD APRX 300 HRS IN SERVICE.

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

ENGINE ASSEMBLY,VALVE,INTAKE..FAILURE,TOTAL



Contributing Factors

LIGHT CONDITION..DARK NIGHT


Contributing Factors

OBJECT..WIRE,TRANSMISSION

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