Pilot Debrief

BEECH 95 near Eden Prairie, MN — 2010-04-01

Final reportCEN10LA188
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Date
2010-04-01
Location
Eden Prairie, MN, USA
Airport
FCM
Aircraft
BEECH 95
Registration
N20FP
Category
Airplane
Highest injury
Serious
Fatalities
0
Phase of flight
Takeoff roll

Probable cause

The fatigue failure of an intake valve spring on the right engine, which resulted in a partial loss of engine power on takeoff.

NTSB narrative

The pilot stated that he had no recollection of the events leading up to the accident. The passenger reported that the airplanes' engines seemed to come up to full power during takeoff. The airplane lifted off about halfway down the runway; however, it didn't climb very well. The stall warning sounded just as the airplane was off the end of the runway, and the pilot's efforts to continue flight were unsuccessful. The right wing dropped, and the airplane descended and impacted the ground. A witness reported that the airplane's nose was pitched up 10 to 15 degrees and the wings appeared to be level, as it was flying in ground effect about 10 feet agl. He noted that the engines seemed to be running without any obvious problems. A postaccident examination revealed a lack of compression on the right engine No. 4 cylinder. Further investigation determined that the intake valve spring on the cylinder had fractured. Metallurgical examination noted that the fracture surfaces exhibited features indicative of fatigue progression initiated by corrosion pitting. Corrosion pits and red rust deposits were observed on many areas of the spring. The fatigue initiation also coincided with longitudinal tooling marks consistent with the original forming of the spring. Maintenance records indicated the right engine had been overhauled nearly 2 years prior to the accident. The cylinders were replaced with new non-original equipment manufacturer (OEM) assemblies at that time. The replacement cylinder assemblies were furnished with the valves and valve springs installed. According to the pilot, the right engine had accumulated 18 hours since overhaul.

Analysis

Primary failure mode
Mechanical failure
First missed decision gate
Pilot could have aborted takeoff when stall warning sounded.

NTSB coding

Evidence available

  • 9 docket documents
View NTSB final reportView NTSB docket

Docket documents9

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