ASN Wikibase Occurrence # 211480
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| Date: | Saturday 26 May 2018 |
| Time: | 09:35 LT |
| Type: |  Cessna 152 |
| Owner/operator: | Hillsboro Aero Academy LLC |
| Registration: | N152GB |
| MSN: | 15279546 |
| Year of manufacture: | 1977 |
| Total airframe hrs: | 10267 hours |
| Engine model: | Lycoming O-235 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Portland-Hillsboro Airport (KHIO), Portland, OR -
 United States of America
|
| Phase: | Landing |
| Nature: | Training |
| Departure airport: | Portland-Hillsboro Airport, OR (HIO/KHIO) |
| Portland-Hillsboro Airport, OR (HIO/KHIO) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While conducting takeoffs and landings during an instructional flight, the student pilot initiated a go-around. Shortly thereafter, the engine began to run rough and lost partial power. The instructor attempted to troubleshoot the engine, but was unable to restore engine power, and initiated a forced landing to a grass area beyond the end of the runway, during which the airplane nosed over. Examination of the engine revealed that the left magneto was producing spark randomly across its four posts. Internal examination of that magneto revealed that the distributor gear was intact; however, the copper electrode finger was found displaced from the plastic gear assembly.
A service bulletin issued by the magneto manufacturer about three years before the accident stated that some units contained distributor gears that exhibited loose electrode fingers, the symptoms of which included "unusual RPM drop during magneto check, difficulty starting, and/or rough running engines." A separate service bulletin issued 38 years before the accident specified that the magnetos should be inspected internally every 500 hours. The operator reported that, at the time of the accident, the magneto had accumulated 402.7 hours since its most recent internal inspection. The operator further reported they conducted internal inspections of the magnetos every 750 hours. It is likely that the loose copper electrode finger resulted in the partial loss of engine power during the go-around.
Probable Cause: The partial loss of engine power during a go-around due to the loose copper electrode finger inside the left magneto.
Accident investigation:
 |
|
Sources:
NTSB WPR18LA148
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=152GB
Location
Media:
Small Plane Flips At Hillsboro Airport https://t.co/cAjDOns1Aq pic.twitter.com/JQjOpaLCro
— Hillsboro Patch (@Hillsboro_Patch) 26 mai 2018
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 26-May-2018 21:08 | Geno | Added |
| 26-May-2018 22:50 | Iceman 29 | Updated [Embed code] |
| 05-Jun-2018 19:29 | Geno | Updated [Time, Phase, Departure airport, Destination airport, Source, Embed code, Narrative] |
| 09-Jul-2022 06:36 | ASN Update Bot | Updated [Time, Other fatalities, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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