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NTSB Report
April 2, 1991 · Cessna 172RG · N9592B
West Chicago, IL
Overview
Report Status
Probable Cause
Event Type
Incident
Date
April 2, 1991
Injury Outcomes
No injuries (2 uninjured)
Location
West Chicago, IL
Aircraft
Cessna 172RG
Tail Number
N9592B
Operator
Av Training Enterprise of Il
Injuries
None
Aircraft Damage
Minor
NTSB Number
CHI91IA120
AFTER REPEATED ATTEMPTS TO LOWER THE LANDING GEAR, ONLY THE LEFT MAIN AND NOSE GEAR WOULD EXTEND. THE PILOTS ELECTED TO MAKE A WHEELS-UP LANDING. DURING THE LANDING, THE LOWER FUSELAGE AND PROPELLER TIPS RECEIVED MINOR DAMAGE. AN INVESTIGATION REVEALED THE RIGHT MAIN LANDING GEAR PIVOT ASSEMBLY (PN 2441100-1) HAD FAILED. A METALLURGICAL EXAMINATION DISCLOSED THE SPLINED SHAFT ON THE PIVOT ASSEMBLY HAD FRACTURED IN TORSIONAL OVERLOAD. AS A RESULT, MECHANICAL EXTENSION OF THE RIGHT MAIN LANDING GEAR WAS NOT POSSIBLE.
NTSB Probable Cause
FAILURE OF THE SPLINED SHAFT ON THE RIGHT MAIN LANDING GEAR PIVOT ASSEMBLY. A FACTOR RELATED TO THE INCIDENT WAS INADEQUATE DESIGN OF THE LANDING GEAR PIVOT ASSEMBLY.
Full Narrative
AFTER REPEATED ATTEMPTS TO LOWER THE LANDING GEAR, ONLY THE LEFT MAIN AND NOSE GEAR WOULD EXTEND. THE PILOTS ELECTED TO MAKE A WHEELS-UP LANDING. DURING THE LANDING, THE LOWER FUSELAGE AND PROPELLER TIPS RECEIVED MINOR DAMAGE. AN INVESTIGATION REVEALED THE RIGHT MAIN LANDING GEAR PIVOT ASSEMBLY (PN 2441100-1) HAD FAILED. A METALLURGICAL EXAMINATION DISCLOSED THE SPLINED SHAFT ON THE PIVOT ASSEMBLY HAD FRACTURED IN TORSIONAL OVERLOAD. AS A RESULT, MECHANICAL EXTENSION OF THE RIGHT MAIN LANDING GEAR WAS NOT POSSIBLE.
Flight
Event TypeIncident
Event Time15:00 CST
Nearest AirportDUPAGE (0nm N)
Runway15
Runway Length3400 ft
Runway Width100 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna 172RG
Tail NumberN9592B
Aircraft CategoryAir
DamageMinor
OperatorAv Training Enterprise of Il
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 25 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind140° @ 10 kt
Visibility15 sm
CeilingNone
Temperature / Dew Point54 / 45 C
Altimeter30.00 inHg
Weather SourceWFAC