ASN Wikibase Occurrence # 296566
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information.
If you feel this information is incomplete or incorrect, you can submit corrected information.
| Date: | Monday 30 September 2002 |
| Time: | 15:30 LT |
| Type: |  Mooney M20J |
| Owner/operator: | Private |
| Registration: | N4232H |
| MSN: | 24-0671 |
| Year of manufacture: | 1978 |
| Total airframe hrs: | 3971 hours |
| Engine model: | Lycoming IO-360-A3B6D |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Oakley, Idaho -
 United States of America
|
| Phase: | Unknown |
| Nature: | Private |
| Departure airport: | Grand Junction-Walker Field, CO (GJT/KGJT) |
| Boise Airport, ID (BOI/KBOI) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During cruise flight, the aircraft began to lose oil pressure, and the propeller rpm stopped responding to the position of the propeller governor control lever. Eventually the engine oil pressure dropped to zero, and the pilot elected to attempt a forced landing on a country road. Although the touchdown was successful, during the landing roll, the aircraft's wings collided with mailboxes mounted on steel poles situated immediately adjacent to the side of the road. It was later determined that both compression rings on the number four piston had failed (fractured), and that a portion of the piston outer wall near the piston dome had eroded away allowing loss of a majority of the engine's oil through the engine exhaust system.
Probable Cause: Failure (fracture) of the two number four piston compression rings, leading to the erosion of a section of the piston sidewall, resulting in the exhaustion of the engine's oil supply during cruise flight, followed by a forced landing on a country road. Factors include mail boxes mounted on metal poles immediately adjacent to the side of the road.
Accident investigation:
 |
|
Sources:
NTSB SEA02LA187
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 14-Oct-2022 08:05 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
The Aviation Safety Network is an exclusive service provided by:
Quick Links:
| ASN Home | Send Correction / Feedback |
| FSF Home | Disclaimer | Copyright |
| Contact Us | Privacy Policy |
| Press / Media |
CONNECT WITH US:
©2024 Flight Safety Foundation