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NTSB Report
July 5, 1994 · Pitts S1 · CGPUR
Heber City, UT
Overview
Report Status
Final with probable cause
Event Type
Accident
Date
July 5, 1994
Injury Outcomes
No injuries (1 uninjured)
Location
Heber City, UT
Aircraft
Pitts S1
Tail Number
CGPUR
Operator
Burke Jonathon
Injuries
None
Aircraft Damage
Substantial
NTSB Number
SEA94LA172
THE PILOT STATED THAT HE LANDED SOMEWHAT HARD ON THE MAIN LANDING GEAR, RECORDING 2 G'S ON HIS ACCELEROMETER. THE RIGHT MAIN LANDING GEAR WHEEL AND AXLE SEPARATED AND THE LANDING GEAR STRUT COLLAPSED. POST-CRASH INSPECTION REVEALED THAT THE FOUR ATTACHMENT BOLTS WERE EXCESSIVELY WORN AND WERE APPARENTLY IMPROPERLY TORQUED.
NTSB Probable Cause
FAILURE OF MAIN LANDING GEAR AXLE HARDWARE. FACTORS INCLUDE COLLAPSE OF MAIN LANDING GEAR STRUT.
Full Narrative
On July 5, 1994, approximately 1617 mountain daylight time, an experimental Pitts S-1 was substantially damaged during roll out when the right wheel/axle attachment hardware failed after landing at Heber City, Utah. The private pilot, who owned the aircraft, was uninjured. Visual meteorological conditions prevailed for the flight, which originated at Heber City at 1601. There was no fire and no report of an ELT actuating. FAA inspectors noted that the nuts and bolts securing the axle to the aircraft were excessively worn, and indicated that the nuts had sheared their threads before separating. The pilot noted that four 1/4-20 bolts failed, causing wheel separation and subsequent gear failure, and indicated that the bolts had not been correctly torqued.
Flight
Event TypeAccident
Event Time16:17 MDT
Nearest AirportHeber Valley (0nm)
Runway21
Runway Length6900 ft
Runway Width75 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftPitts S1
Tail NumberCGPUR
Aircraft CategoryAir
DamageSubstantial
OperatorBurke Jonathon
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-360-A1A · Reciprocating · 180
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 38 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind210° @ 18 kt, gusting 40 kt
Visibility30 sm
CeilingNone
Temperature / Dew Point0 C
Altimeter29.00 inHg
Weather SourcePILO