ASN Wikibase Occurrence # 139286
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| Date: | Monday 17 October 2011 |
| Time: | 14:00 |
| Type: |  Piper PA-28R-200 Cherokee Arrow II |
| Owner/operator: | Wisconsin Aviation-four Lakes Inc |
| Registration: | N300KR |
| MSN: | 28R-7635210 |
| Year of manufacture: | 1976 |
| Total airframe hrs: | 7102 hours |
| Engine model: | Lycoming IO-360-C1C |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | South 12th Street, near Watertown Municipal Airport - KRYV, WI -
 United States of America
|
| Phase: | En route |
| Nature: | Training |
| Departure airport: | Watertown, WI (RYV) |
| Watertown, WI (RYV) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilots were about 5 miles from the destination airport when they heard a "loud bang" and engine oil immediately covered the front windshield. The engine continued to produce partial power until the airplane was in the airport traffic pattern, and then it lost total power. Due to a complete lack of forward visibility and another airplane in the runway run-up area, the flight instructor elected to make a forced landing on a roadway bordering the east side of the airport. The airplane struck a car and a pole before coming to a stop.
A postaccident examination of the engine revealed that the number 2 connecting rod had separated from the crankshaft. The connecting rod failed about mid-length, with the upper portion remaining attached to the piston. The lower portion of the connecting rod was not recovered. The upper portion of the connecting rod and a recovered section of the rod cap both failed as a result of overstress bending. Neither component appeared discolored, which suggests there was an adequate engine oil supply before the failure. The number 1 and 3 connecting rods remained attached to the crankshaft; the number 4 connecting rod had separated from the crankshaft. The number 1, 3, and 4 connecting rods were discolored, consistent with continued operation with an insufficient supply of engine oil. Deformation of the lower end of the number 4 connecting rod was consistent with secondary mechanical damage; however, the rod appeared otherwise undeformed.
A lack of evidence of oil starvation and the preponderance of crankcase damage in the area of the number 2 cylinder suggests that the engine failure was initiated by the separation of the number 2 connecting rod from the crankshaft. Metallurgical examination of the number 2 cylinder assembly and related components did not identify the initiating cause of this connecting rod separation. The total loss of engine power occurred upon separation of the number 4 connecting rod, which was precipitated by the prior loss of engine oil and secondary to the initial failure.
Probable Cause: The separation of the number 2 connecting rod from the crankshaft for reasons that could not be determined during postaccident metallurgical examination, which ultimately resulted in a total loss of engine power.
Accident investigation:
 |
|
Sources:
NTSB
History of this aircraft
Other occurrences involving this aircraft
| 5 November 2016 | N300KR | Wisconsin Aviation | 0 | Watertown, WI | |
sub |
| Undershoot | ||||||
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 17-Oct-2011 12:24 | gerard57 | Added |
| 17-Oct-2011 12:54 | gerard57 | Updated [Aircraft type] |
| 17-Oct-2011 13:29 | Geno | Updated [Aircraft type, Registration, Cn, Operator, Location, Departure airport, Destination airport, Source, Narrative] |
| 17-Oct-2011 13:29 | Anon. | Updated [Operator] |
| 17-Oct-2011 14:42 | RobertMB | Updated [Time, Aircraft type, Registration, Cn, Operator, Location, Destination airport, Source, Damage, Narrative] |
| 18-Oct-2011 15:26 | RobertMB | Updated [Total occupants, Narrative] |
| 24-Oct-2011 10:06 | Geno | Updated [Source] |
| 21-Dec-2016 19:26 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 27-Nov-2017 17:21 | ASN Update Bot | Updated [Operator, Total occupants, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative] |
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