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ASN Wikibase Occurrence # 34446
Last updated: 3 December 2021
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Type:Silhouette image of generic BOLT model; specific model in this crash may look slightly different
Steen Skybolt
Registration: N3EG
MSN: SS-001
Fatalities:Fatalities: 0 / Occupants: 2
Aircraft damage: Substantial
Location:Pendleton County, Kentucky -   United States of America
Phase: Unknown
Departure airport:Falmouth, KY (K62)
Destination airport:
Investigating agency: NTSB
While in cruise flight at 2,000 feet the engine suddenly stopped producing power. The pilot and passenger, wearing parachutes, elected to parachute to the ground. Eyewitnesses reported seeing the pilot leave the airplane approximately 10 to 15 seconds after the passenger departed and after placing the airplane in a nose dive. The airplane impacted a rectangular farm field and the pilot and passenger suffered serious injuries due to the low altitude in which they parachuted from. The airplane had been purchased by the accident pilot approximately one month prior to the accident. According to the airplane's engine maintenance log, on April 28, 2004, the engine had undergone a preservation process called "pickling." The process utilized 10 quarts of pickling oil and the engine was placed in storage. On May 9, 2006 the engine was drained of the pickling oil and replaced with 7 quarts of 50 WT oil. The cylinders were drained and cleaned, and then the engine was test ran. The NTSB Materials laboratory examined components of the engine and analyzed an unknown substance within the lubricating journals of the camshaft and crankshaft. The compounds of the unknown substance was those found in corrosion preservation fluids also known as pickling fluids and are not found in lubricating oil. The presence of these compounds indicates that it was likely that some pickling fluids were still in the engine at the time of the accident; however, a specific pickling fluid could not be determined. According to the engine manufacturer, pickling fluid has been known to clog lubrication channels by forming a tarry residue when present in engines for prolonged periods and result in oil starvation. The number 2 main bearing and piston were thermally damaged and that thermal damage is consistent with oil starvation. Therefore it is possible that the residual pickling fluid clogged the lubrication channels for the number 2 position resulting in oil starvation.
Probable Cause: A loss of engine power due to oil starvation as a result of improper servicing (removal of preserving fluid) of the engine after it had been returned from storage.



Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 7 months
Download report: Final report

Revision history:

13-Oct-2008 10:52 angels one five Added
03-Dec-2017 12:06 ASN Update Bot Updated [Time, Cn, Operator, Other fatalities, Departure airport, Destination airport, Source, Damage, Narrative]

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