ASN Wikibase Occurrence # 368240
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| Date: | Tuesday 8 August 1989 |
| Time: | 13:09 LT |
| Type: |  Grumman American AA-5B |
| Owner/operator: | Private |
| Registration: | N28565 |
| MSN: | AA5B-0684 |
| Year of manufacture: | 1977 |
| Total airframe hrs: | 1393 hours |
| Engine model: | LYCOMING O-360-A4K |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Terminal Island, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Long Beach, CA (KLGB) |
| Avalon, CA (KAVX) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
DURING AN OVERWATER FLT TO CROSS A 23 MI CHANNEL, THE ENG BEGAN TO RUN ROUGH & LOOSE POWER. THE PLT TURNED TOWARD THE SHORE & MADE A FORCED LANDING ON A DIRT ROAD ON TERMINAL ISLAND. BEFORE THE ACFT STOPPED, IT COLLIDED WITH A FENCE & SVRL PARKED CARS IN A STORAGE LOT. AN EXAM OF THE ENG REVEALED THE TOP OF THE #1 PISTON & THE #1 CYLINDER HEAD WERE SEVERELY BATTERED; THE #1 EXHAUST VALVE HEAD HAD SEPD FROM ITS STEM & WAS FOUND IN THE EXHAUST SYSTEM; THE EXHAUST VALVE GUIDE WAS SEVERELY WORN AT THE EXHAUST PORT; AND THE VALVE STEM AREA WAS HEAVILY CORRODED & COKED WITH EXHAUST RESIDUE. A FATIGUE FRACTURE WAS IDENTIFIED ON A PORTION OF THE VALVE HEAD THAT WAS NOT DAMAGED. A METALLURGICAL EXAM REVEALED EVIDENCE THAT THE VALVE HAD FAILED FROM FATIGUE DUE TO OVERHEATING, WHICH RESULTED FROM A WORN OR BELL MOUTHED VALVE GUIDE.
Probable Cause: THE FATIGUE FAILURE OF AN EXHAUST VALVE DUE TO EXCESSIVE WEAR OF THE RESPECTIVE VALVE GUIDE. FACTORS RELATED TO THE ACCIDENT WERE: THE FENCE & CARS IN THE EMERGENCY LANDING AREA.
Accident investigation:
 |
|
Sources:
NTSB LAX89LA267
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 23-Mar-2024 16:17 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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