ASN Wikibase Occurrence # 178270
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| Date: | Monday 3 August 2015 |
| Time: | 10:00 |
| Type: | Cessna TU206G Turbo Stationair |
| Owner/operator: | Private |
| Registration: | N235HM |
| MSN: | U20606795 |
| Year of manufacture: | 1984 |
| Total airframe hrs: | 2316 hours |
| Engine model: | Continental TSIO520M |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | St. Ignatius, Lake County, MT -
 United States of America
|
| Phase: | Landing |
| Nature: | Private |
| Departure airport: | Bozeman, MT (B2N) |
| Polson, MT (8S1) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot was conducting the airplane’s first flight since the engine had undergone maintenance several months earlier. He reported that, after about 45 minutes of flight, he noticed that the exhaust gas temperature (EGT) had increased but that he was able to reduce the temperature by increasing the fuel flow. Shortly after, the EGT again increased, and the pilot began to troubleshoot the issue. The pilot stated that, after he turned the electric fuel boost pump on a second time, the engine ran normally for about 2 minutes and then lost power. He determined that the airplane would be unable to reach the airport, so he initiated a forced landing to a road. During the landing roll, the airplane struck vegetation and a fence.
During a postaccident examination of the airplane, blue fuel stains were observed on the top of the engine. The fuel line attached to the fuel flow transducer was found finger tight and leaking. A review of the airplane’s maintenance records indicated that, during the maintenance conducted several months before the accident, three cylinders, including the No. 6 cylinder, had been removed and reinstalled. The fuel line attached to the fuel flow transducer was just above the No. 6 cylinder and, therefore, it would been removed to access the cylinder during the maintenance. It is likely that maintenance personnel did not adequately tighten the fuel line during its reinstallation, which led to the loss of fuel pressure and the subsequent loss of engine power.
Probable Cause: Maintenance personnel’s failure to tighten a fuel line, which resulted in a loss of fuel pressure and a subsequent loss of engine power during cruise flight and an off-airport landing and collision with obstacles.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=235HM
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 04-Aug-2015 05:06 | Geno | Added |
| 04-Aug-2015 16:36 | Geno | Updated [Aircraft type, Registration, Cn, Operator, Nature, Source] |
| 21-Dec-2016 19:30 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 01-Dec-2017 15:07 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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