ASN Wikibase Occurrence # 223987
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| Date: | Sunday 13 August 2017 |
| Time: | 17:00 |
| Type: |  Piper J3C Cub |
| Owner/operator: | Berkshire Aviation Enterprises Inc |
| Registration: | N98550 |
| MSN: | 18763 |
| Year of manufacture: | 1946 |
| Total airframe hrs: | 2093 hours |
| Engine model: | Continental C90-8F |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Salisbury, CT -
 United States of America
|
| Phase: | |
| Nature: | Training |
| Departure airport: | Great Barringto, MA (GBR) |
| Great Barringto, MA (GBR) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During cruise flight, the airplane experienced a total loss of engine power, and the flight instructor performed a forced landing into trees. The engine crankshaft was replaced about 4 years and about 317 hours of operation before the accident. Teardown examination of the engine revealed that the crankshaft gear screws were fractured, and the crankshaft gear was separated from the crankshaft. Fretting was observed near two of the four crankshaft screw holes and corresponded to two elongated screw holes on the crankshaft gear. The crankshaft and crankshaft gear did not contain a dowel pin as specified in the most current versions of the manufacturer’s illustrated parts catalog and overhaul manual, which were published more than 2 years before the crankshaft replacement. Additionally, the crankshaft gear did not contain a dowel pin hole, which was consistent with a crankshaft gear for an older, different model engine. Both publications contained numerous instructions and references to use a crankshaft gear with a dowel pin hole and to align the gear to the crankshaft with a dowel pin, which would pilot the crankshaft gear on the crankshaft. Thus, it is likely that when the crankshaft was replaced, maintenance personnel did not use the most recent manuals and installed a crankshaft gear for a different engine, which led to the crankshaft gear’s failure and the subsequent loss of all engine power.
Probable Cause: An improper replacement of the crankshaft by maintenance personnel, which resulted in a failure of the crankshaft gear and total loss of engine power.
Accident investigation:
 |
|
Sources:
NTSB
History of this aircraft
Other occurrences involving this aircraft
| 5 July 2011 | N98550 | Private | 0 | Egremont, near Great Barrington Airport - KGBR, MA | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 15-Apr-2019 14:42 | ASN Update Bot | Added |
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