ASN Wikibase Occurrence # 284524
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| Date: | Friday 27 July 2007 |
| Time: | 12:12 LT |
| Type: |  Piper PA-24-260 |
| Owner/operator: | |
| Registration: | N8637P |
| MSN: | 24-4078 |
| Year of manufacture: | 1964 |
| Total airframe hrs: | 5435 hours |
| Engine model: | Lycoming IO-540 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Ramona, California -
 United States of America
|
| Phase: | Unknown |
| Nature: | Private |
| Departure airport: | Ramona Airport, CA (KRNM) |
| Ramona Airport, CA (KRNM) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot was performing a test flight to confirm the operation of newly installed avionics. During the return flight to the airport, the engine began to "backfire" and then lost all power. The pilot went through the emergency checklist, but was unable to restart the engine. The pilot force landed the airplane in a dirt field with the landing gear retracted. Both fuel tanks were found to be approximately 1/2 full. Further examination of the airframe revealed a short circuit of both magneto grounding leads in the electrical wiring between the magneto switch and the magneto. The investigation determined that he wiring harnesses were original to the airplane, which was manufactured in 1964. Investigators were able to successfully start the engine and perform a run-up under two separate conditions. The first engine start occurred after investigators disconnected both p-leads at their respective magneto terminals. The second engine start occurred after new electrical wire was connected from the magneto switch to both magnetos. Investigators noted the general overall poor condition of the p-lead electrical wiring. A review of the engine logbook revealed that the engine had been returned to service following a 100-hour inspection about a month prior to the accident. The engine logbook entry indicated that maintenance personnel checked wires, cables, and hoses for condition and security.
Probable Cause: A total loss of engine power due to a short circuit between both magneto ground leads. A factor in the accident was the inadequate annual/100-hour maintenance inspection regarding the wires.
Accident investigation:
 |
|
Sources:
NTSB LAX07LA234
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 30-Sep-2022 18:04 | ASN Update Bot | Added |
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