ASN Wikibase Occurrence # 352718
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| Date: | Saturday 28 August 1999 |
| Time: | 13:10 LT |
| Type: |  Mooney M20J |
| Owner/operator: | Resort Automation, Inc. |
| Registration: | N4201S |
| MSN: | 24-0573 |
| Year of manufacture: | 1978 |
| Total airframe hrs: | 4889 hours |
| Engine model: | Lycoming IO-360-A3B6D |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Emigrant Gap, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Palmdale, CA (KWGF) |
| Truckee, CA (KTRK) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot was at cruise altitude of 9,500 feet when he heard a loud metallic bang. The airframe began to shake violently and the engine started running rough immediately following the noise. The pilot turned toward a nearby airport and the engine suddenly quit. The pilot was able to glide to the airport and touched down on the 3,300-foot-long runway; however, he had carried extra speed on the approach to allow a maneuvering margin to miss a large ravine off the runway's approach end. The airplane ran off the end of the runway and subsequently struck scrub bush. Postaccident examination of the engine revealed that the number three cylinder had separated in half between the Nos. 9 and 10 cooling fins. Metallurgical examination disclosed that the fracture was due to a fatigue crack, which had emanated from a notch and groove on the outer radius of one cooling fin. The notch and groove were painted the same color as the engine. The engine was overhauled 16 hours prior to the accident with 3 new cylinders installed, including the failed one.
Probable Cause: The fatigue failure and separation of the number three cylinder due to the cylinder overhaul facility's improper inspection and quality control processes.
Accident investigation:
 |
|
Sources:
NTSB LAX99LA287
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 08-Mar-2024 15:09 | ASN Update Bot | Added |
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