ASN Wikibase Occurrence # 42857
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| Date: | Thursday 30 October 1997 |
| Time: | 17:48 LT |
| Type: |  Beechcraft 58 Baron |
| Owner/operator: | Charles F. Ross |
| Registration: | N472TL |
| MSN: | TH1112 |
| Year of manufacture: | 1980 |
| Total airframe hrs: | 2750 hours |
| Engine model: | Continental I0-520-CB |
| Fatalities: | Fatalities: 6 / Occupants: 6 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | New Berlin, Sangamon County, IL -
 United States of America
|
| Phase: | En route |
| Nature: | Executive |
| Departure airport: | Macomb, IL (KMQB) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The twin-engine airplane began its instrument flight loaded about 800 pounds beyond its certificated maximum gross take off weight. Shortly after reaching its assigned altitude of 7,000 feet above mean sea level, the pilot advised the FAA controller, '...we have an engine problem.' The problem was not identified during a subsequent radio transmission. Shortly after the pilot's last radio transmission, witnesses on the ground observed the airplane in a counterclockwise flat spin. The on-scene examination revealed the left engine had suffered a mechanical failure. Continuity of the flight, engine, fuel and propeller controls was established. An oil film was found on the left engine's nacelle, inboard half of the wing, left side of the fuselage and the horizontal stabilizer and elevator. The left engine case had fractured near the number 2 cylinder. Examination of the case fracture surfaces revealed fatigue failure at its initiation point. The fatigue extended about 7 inches from its origin. Additionally, the number 2 cylinder connecting rod had separated from the crankshaft journal. Maintenance records showed the engine had a crankcase crack that was not covered by an FAA Airworthiness Directive or engine manufacturer specifications. The maintenance personnel informed the pilot about the crack. Examination of the airplane's hangar floor revealed a pool of fresh oil beneath the area where the left engine would have been positioned. Oil-based tire imprints made by the left main landing gear tire were found on the hangar floor that lead from the oil pool to the ramp outside the hangar. The pilot's logbook records showed he had received 4 hours of multi-engine flight instruction during one flight session on one day. The next day the logbook showed the pilot had received 10-hours of multi-engine instruction during 2 flight sessions. He obtained his multi-engine rating on the third day. Before these instructional entries were made there were 6 other flight instruction entries showing, 'X Country IFR.'
Probable Cause: A loss of engine power due to separation of the left engine's number 2 connecting rod as a result of fatigue failure. Also causal was the pilot's failure to maintain adequate airspeed which resulted in a stall/spin. Contributing to the accident was the pilot's operation of the aircraft with known deficiencies and exceeding the maximum gross weight of the airplane.
Accident investigation:
 |
|
Sources:
NTSB CHI98FA028
FAA register: 2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?omni=Home-N-Number&nNumberTxt=472TL
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 03-Mar-2016 22:49 | Dr.John Smith | Updated [Time, Operator, Location, Departure airport, Source, Narrative] |
| 21-Dec-2016 19:24 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 19-Aug-2017 12:17 | Aerossurance | Updated [Time, Operator, Location, Departure airport, Source] |
| 08-Apr-2024 12:00 | ASN Update Bot | Updated [Time, Cn, Operator, Other fatalities, Departure airport, Source, Narrative, Category, Accident report] |
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