ASN Wikibase Occurrence # 23028
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| Date: | Wednesday 22 February 2006 |
| Time: | 18:54 |
| Type: |  Beechcraft 58P Baron |
| Owner/operator: | Private |
| Registration: | N469MD |
| MSN: | TJ-331 |
| Year of manufacture: | 1981 |
| Total airframe hrs: | 9401 hours |
| Engine model: | Continental TSIO-520 |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | 2 nm S Bow, Skagit County, Washington -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Bellingham, WA (BLI) |
| Ogden, UT (OGD) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
Approximately 11 minutes after takeoff on a night instrument flight rules flight plan, the pilot of the twin-engine airplane radioed air traffic control (ATC) that he was climbing out of 7,800 feet. Shortly thereafter, ATC received a "mayday" transmission followed by "lost an engine." Subsequently, radio communications and radar contact with the airplane were lost. Witnesses reported they observed the airplane in an unusually steep descent prior to impacting terrain. One witness stated he heard a high-pitched noise emanating from the airplane as it descended toward the ground. The wreckage was located in an open field adjacent to a highway. The main wreckage was located in the confines of a large impact crater approximately 15 feet in diameter and 6 feet deep. Dark night conditions with low ceilings prevailed at the time of the accident. Post-accident teardown and examination of both engines revealed no evidence of excessive wear or operational failure of internal engine components. Extensive damage, however, was noted to the right turbocharger assembly. Disassembly of the component revealed damage to the compressor wheel and compressor housing shroud. Circumferential scuffing and pockmarks were noted to the inner compressor housing, and impact type damage and smearing were noted to the individual compressor blades. Scuffing type damage was noted to the turbine wheel and corresponding turbine housing. Additional damage was noted to the turbine/compressor input shaft, and associated journals and bearings. Foreign material was found in the compressor housing and turbocharger after cooler. The material consisted of aluminum fragments, a rivet head, a piece of brass, paint chips, rubber, gasket material and dirt. The manufacturer of the turbo assembly examined the unit and reported the damage was consistent with FOD (foreign object damage) and lubricant starvation. The exact sequence of events leading to the failure of the turbocharger was not determined.
Probable Cause: The pilot's failure to maintain aircraft control during the climb to cruise. Contributing factors included a loss of engine power to the right engine folowing a turbocharger failure, instrument meteorological and dark night conditions.
Accident investigation:
 |
|
Sources:
NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20060301X00257&key=1
FAA register: 3. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?omni=Home-N-Number&nNumberTxt=469MD
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 27-Sep-2008 01:00 | ASN archive | Added |
| 04-Mar-2016 01:14 | Dr.John Smith | Updated [Time, Registration, Cn, Operator, Total occupants, Location, Nature, Departure airport, Destination airport, Source, Narrative] |
| 05-Dec-2017 10:12 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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