Pilot Debrief

CZECH AIRCRAFT WORKS SPOL SRO SPORTCRUISER near Freehold, NY — 2010-06-18

Final reportERA10LA330
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Date
2010-06-18
Location
Freehold, NY, USA
Airport
1I5
Aircraft
CZECH AIRCRAFT WORKS SPOL SRO SPORTCRUISER
Registration
N832LL
Category
Airplane
Highest injury
None
Fatalities
0
Phase of flight
Landing

Probable cause

The failure of the nosegear fork assembly due to fatigue. Contributing to the accident was an inadequate recent annual inspection.

NTSB narrative

The student pilot was practicing landings in a special light sport aircraft on an asphalt runway. After a soft touchdown, the nosegear collapsed and the airplane skidded approximately 30 feet before coming to rest on the runway. Examination of the wreckage revealed damage to the forward fuselage and firewall. The nosegear fork assembly separated from the nosegear strut on one end, and separated from the nosewheel on the other end. Further examination of the nosegear assembly revealed the fork of the assembly consisted of two aluminum fork leaves riveted together, which exhibited cracks. The inner fork leaf, which extended further than the outer leaf, had through holes for the wheel’s axle. The inner fork leaf was found to also have cracks on the side opposite the one that had separated. Microscopic examination revealed that the fractures on both pieces of the inner fork leaf were due to fatigue that initiated at multiple origins. Collectively, the fatigue cracks went through the thickness of the fork leaf. The large number of fatigue cracks was consistent with the nose gear fork assembly deteriorating for an extended period of time. The cracks were of a size that could be identified by visual examination. The nosegear strut exhibited slant fractures consistent with overstress. The airplane's most recent annual inspection was completed about 3 months, and 38 hours of operation, prior to the accident.

Analysis

Primary failure mode
Mechanical failure
First missed decision gate
Inspection could have identified fatigue cracks in the nosegear assembly before the accident.

NTSB coding

Evidence available

  • 6 docket documents
View NTSB final reportView NTSB docket

Docket documents6

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