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NTSB Report
February 2, 2013 · Champion 7GCAA · N9691S
Oshkosh, WI
Overview
Report Status
Final with probable cause
Event Type
Accident
Date
February 2, 2013
Injury Outcomes
No injuries (2 uninjured)
Location
Oshkosh, WI
Aircraft
Champion 7GCAA
Tail Number
N9691S
Operator
Keith Mustain
Injuries
None
Aircraft Damage
Substantial
NTSB Number
CEN13CA187
After performing three touch-and-go landings on a frozen lake, the pilot set up for a full stop landing on the plowed surface of the frozen lake. After a smooth landing, and while taxiing to park, the left wheel strut collapsed. The airplane tipped over onto its left side, resulting in substantial damage to the left wing spar. Examination of the airplane after the accident revealed evidence of fatigue cracking on the failed portion of the left wheel strut mount. The airplane had been flown about 50-75 hours after its last annual inspection with no problems noted by the owner. The pilot stated that he lands on frozen lakes frequently and that the collapse of the landing gear was unexpected.
NTSB Probable Cause
Fatigue cracking and failure of the left wheel strut mount resulting in collapse of the left main landing gear during taxi.
Full Narrative
After performing three touch-and-go landings on a frozen lake, the pilot set up for a full stop landing on the plowed surface of the frozen lake. After a smooth landing, and while taxiing to park, the left wheel strut collapsed. The airplane tipped over onto its left side, resulting in substantial damage to the left wing spar. Examination of the airplane after the accident revealed evidence of fatigue cracking on the failed portion of the left wheel strut mount. The airplane had been flown about 50-75 hours after its last annual inspection with no problems noted by the owner. The pilot stated that he lands on frozen lakes frequently and that the collapse of the landing gear was unexpected.
Flight
Event TypeAccident
Event Time15:30 CST
Nearest AirportOSHKOSH (7nm)
Flight Plan FiledVFR
Flight Plan ActivatedNo
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftChampion 7GCAA
Tail NumberN9691S
Aircraft CategoryAir
DamageSubstantial
OperatorKeith Mustain
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · 0-320 SERIES · Reciprocating · 180
Seats2
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 55 · Third Class · None
Conditions
ConditionsVMC
LightDaylight
Wind280° @ 5 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0
Observation Time21:30
Weather SourceWFAC