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ASN Wikibase Occurrence # 138871
Last updated: 7 December 2020
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Type:Silhouette image of generic GLAS model; specific model in this crash may look slightly different
Glasair III
Registration: N43KH
C/n / msn: 3021
Fatalities:Fatalities: 1 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Location:Pine Tree Inn, Falls of Rough, Grayson County, KY -   United States of America
Phase: Approach
Departure airport:Falls of Rough, KY (2I3)
Destination airport:Falls of Rough, KY (2I3)
Investigating agency: NTSB
According to witnesses, the airplane departed the airport and circled back to make a fly-by over the runway. As the airplane flew over the runway, a witness reported that the engine sounded like it “over revved.” Witnesses also stated that they saw what appeared to be a puff of smoke emitting from the nose of the airplane. The pilot made a left banking turn, and then entered a left downwind for the runway. The engine power seemed to surge as the airplane descended. Then the engine went silent and the airplane turned toward the airport but did not have enough altitude to reach the runway. The pilot appeared to level the wings, and the landing gear was lowered as the airplane descended into the trees, struck a building, and exploded.

A postaccident examination of the airplane revealed that it was equipped an automotive Chevrolet LS1 engine. The airplane’s propeller was attached to a propeller speed reduction unit (PSRU). The system was designed with an automatic clutch and was tuned to remain disengaged at idle and engage with an increase in power. An examination of the PSRU revealed that the propeller drive shaft fractured as a result of fatigue. This fracture separated the propeller drive gears from the clutch, which resulted in the loss of power to the propeller. Given the witness accounts of the loss of engine power, it is likely that the airplane lost airspeed and altitude due to this condition.
Probable Cause: The failure of the propeller power speed reduction unit, which resulted in a loss of engine power at low altitude.



Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 9 months
Download report: Final report


Photo: NTSB

Revision history:

30-Sep-2011 14:11 gerard57 Added
30-Sep-2011 14:34 gerard57 Updated [Other fatalities, Source, Narrative]
01-Oct-2011 01:17 Geno Updated [Location, Source]
01-Oct-2011 02:00 RobertMB Updated [Aircraft type, Location, Departure airport, Source, Narrative]
01-Oct-2011 11:36 harro Updated [Time, Narrative]
01-Oct-2011 18:30 RobertMB Updated [Time, Aircraft type, Registration, Cn, Operator, Phase, Departure airport, Source, Narrative]
10-Oct-2011 22:04 Geno Updated [Departure airport, Source, Narrative]
21-Dec-2016 19:26 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
27-Nov-2017 17:15 ASN Update Bot Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative]
17-Feb-2019 07:35 jasonmaky Updated [Source]
17-Feb-2019 07:36 harro Updated [Other fatalities, Source, Photo, Accident report, ]

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