Accident Evektor EV-97 SportStar N503RK, Saturday 21 May 2022
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Date:Saturday 21 May 2022
Time:13:53 LT
Type:Silhouette image of generic EVSS model; specific model in this crash may look slightly different    
Evektor EV-97 SportStar
Owner/operator:Ajilix Aerospace LLC
Registration: N503RK
MSN: 20050503
Year of manufacture:2006
Total airframe hrs:539 hours
Engine model:Lycoming O-360
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Location:Lancaster-Fairfield County Airport, OH (KLHQ) -   United States of America
Phase: Approach
Departure airport:Lancaster-Fairfield County Airport, OH (KLHQ)
Destination airport:Lancaster-Fairfield County Airport, OH (KLHQ)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
The pilot observed a reduction in engine power shortly after takeoff. While attempting to return to the airport, the engine lost power completely while on the downwind leg of the airport traffic pattern, after which the pilot performed an off-airport landing. The airplane's fuselage and horizontal stabilizer were substantially damaged during the landing.
Postaccident examination of the engine revealed that the pushrod O-rings had been incorrectly installed. This improper installation led to the disintegration of the O-rings, and the resulting debris to blocked the oil ports to the No. 4 connecting rod bearing. The lack of oil to the bearing resulted in the failure of the connecting rod, and the subsequent total loss of engine power.
The airplane's maintenance logbooks did not document any recent engine maintenance that would have required removing the engine's cylinder heads. The cylinders were removed and reinstalled following repair nearly 9 years, and about 58 tachometer hours, before the accident. Based on available information, it is likely that the O-rings were improperly installed during this maintenance.

Probable Cause: The improper installation and subsequent failure of the pushrod O-rings, which resulted in failure of the No. 4 connecting rod due to oil starvation.

Accident investigation:
Investigating agency: NTSB
Report number: ERA22LA241
Status: Investigation completed
Duration: 1 year and 9 months
Download report: Final report




Revision history:

03-Mar-2024 15:23 ASN Update Bot Added
03-Mar-2024 15:32 ASN Updated [Aircraft type, Operator, Location, Departure airport, Destination airport, Narrative]

Corrections or additions? ... Edit this accident description

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