ASN Wikibase Occurrence # 146863
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| Date: | Sunday 22 July 2012 |
| Time: | 13:30 |
| Type: |  Glasair GlaStar |
| Owner/operator: | Private |
| Registration: | N4970Y |
| MSN: | 5377 |
| Total airframe hrs: | 1424 hours |
| Engine model: | SUBARU Boxer 2.5L |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Port District land north of Calumet Park, Chicago, IL -
 United States of America
|
| Phase: | Landing |
| Nature: | Private |
| Departure airport: | Osh Kosh, WI (OSH) |
| Benton Harbor, MI (BEH) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot was on a cross-country flight in an experimental airplane when the engine began to “race.” The pilot tried to reduce power by adjusting the throttle, but the engine and propeller were unresponsive. He then made a forced landing to a soft field, and the airplane nosed over. Examination of the automotive engine revealed that the spline-shaft and adapter gears in the reduction gearbox were worn, which resulted in the gearbox's failure. According to the pilot, the gearbox was not a regularly inspected item for this particular engine/gearbox combination. At the time it failed, the gearbox had accrued 247 total hours since new.
Probable Cause: Failure of the automotive engine's reduction gearbox while in cruise flight.
Accident investigation:
 |
|
Sources:
NTSB
History of this aircraft
Other occurrences involving this aircraft
| 21 August 2005 | N4970Y | William Yomokoski | 0 | Marcellus, Michigan | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 22-Jul-2012 20:31 | Geno | Added |
| 30-Jul-2012 04:13 | gerard57 | Updated [Damage] |
| 21-Dec-2016 19:28 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 27-Nov-2017 20:54 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
Corrections or additions? ... Edit this accident description
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