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NTSB Report
December 5, 1991 · Cessna 172RG · N9320D
Broomfield, CO
Overview
Report Status
Probable Cause
Event Type
Incident
Date
December 5, 1991
Injury Outcomes
No injuries (2 uninjured)
Location
Broomfield, CO
Aircraft
Cessna 172RG
Tail Number
N9320D
Operator
Airwest Flying Club
Injuries
None
Aircraft Damage
Minor
NTSB Number
DEN92IA014
UPON RETURN FROM A LOCAL AREA INSTRUCTIONAL FLIGHT, THE LEFT MAIN LANDING GEAR FAILED TO EXTEND. AFTER REPEATED UNSUCCESSFUL ATTEMPTS TO EXTEND AND LOCK THE LEFT MAIN LANDING GEAR, THE PILOT MADE AN INTENTIONAL WHEELS UP LANDING. POST INCIDENT EXAMINATION DISCLOSED THE LANDING GEAR PIVOT ASSEMBLY FAILED IN DUCTILE TORSIONAL OVERSTRESS. THERE WAS NO EVIDENCE OF FATIGUE OR PREEXISTING CRACKS.
NTSB Probable Cause
FAILURE OF THE LEFT MAIN LANDING GEAR PIVOT ASSEMBLY DUE TO DUCTILE TORSIONAL OVERSTRESS.
Full Narrative
UPON RETURN FROM A LOCAL AREA INSTRUCTIONAL FLIGHT, THE LEFT MAIN LANDING GEAR FAILED TO EXTEND. AFTER REPEATED UNSUCCESSFUL ATTEMPTS TO EXTEND AND LOCK THE LEFT MAIN LANDING GEAR, THE PILOT MADE AN INTENTIONAL WHEELS UP LANDING. POST INCIDENT EXAMINATION DISCLOSED THE LANDING GEAR PIVOT ASSEMBLY FAILED IN DUCTILE TORSIONAL OVERSTRESS. THERE WAS NO EVIDENCE OF FATIGUE OR PREEXISTING CRACKS.
Flight
Event TypeIncident
Event Time16:45 MST
Nearest AirportJefferson County (0nm)
Runway29
Runway Length9000 ft
Runway Width100 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna 172RG
Tail NumberN9320D
Aircraft CategoryAir
DamageMinor
OperatorAirwest Flying Club
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-360-F1A6 · Reciprocating · 180
Seats4
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 29 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind300° @ 8 kt
Visibility20 sm
CeilingNone
Temperature / Dew Point41 C / 25 C
Altimeter30.00 inHg
Weather SourceWIT