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ASN Wikibase Occurrence # 211925
Last updated: 20 September 2019
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Type:Silhouette image of generic RV4 model; specific model in this crash may look slightly different
Vanís RV-4
Registration: N7765X
C/n / msn: 3890
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Location:near Pittsburgh/Butler Regional Airport (KBTP), Butler, PA -   United States of America
Phase: Initial climb
Departure airport:Butler County/K. W. Scholter Field Airport, PA (BTP/KBTP)
Destination airport:Butler County/K. W. Scholter Field Airport, PA (BTP/KBTP)
Investigating agency: NTSB
Shortly after takeoff on an extended crosswind leg about 800 ft mean sea level, the engine lost total power. The private pilot continued ahead and landed the airplane in a field. During the landing, the airplane impacted a wire fence and brush, which resulted in substantial damage to the fuselage and wings.
During postaccident interviews, the pilot reported that this was the first flight after he had made maintenance repairs to the automobile-converted engine due to an engine failure 1 month before the accident. He stated that he installed an aftermarket engine control unit and modified the fuel delivery software, which resulted in the engine running too lean for flight and likely caused detonation and piston damage to occur. During the run-up before the accident flight, the pilot was aware that the engine was not producing power as it should. However, he decided to depart with a known engine problem, and his decision to do so led to the accident.

Probable Cause: The pilot's improper decision to fly the airplane with a known engine problem and his improper modification of the engine control unit fuel delivery software, which led to the engine running too lean and resulted in a total loss of engine power during climb.



FAA register:

Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 8 months
Download report: Final report


Photo: FAA

Revision history:

07-Jun-2018 23:49 Geno Added
07-Jun-2018 23:58 Geno Updated [Date]
08-Jun-2018 07:29 Iceman 29 Updated [Time, Source, Embed code]
10-Feb-2019 10:48 ASN Update Bot Updated [Time, Operator, Nature, Departure airport, Destination airport, Source, Narrative, Accident report, ]
10-Feb-2019 12:04 harro Updated [Departure airport, Destination airport, Source, Embed code, Narrative, Photo]
10-Feb-2019 12:05 harro Updated [Phase, Embed code]

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