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NTSB Report
March 15, 1993 · Cessna 182 · N466KT
Lake Havasu, AZ
Overview
Report Status
Probable Cause
Event Type
Accident
Date
March 15, 1993
Injury Outcomes
No injuries (4 uninjured, 1 unknown outcome)
Location
Lake Havasu, AZ
Aircraft
Cessna 182
Tail Number
N466KT
Operator
M Kent Christopherson
Injuries
None
Aircraft Damage
Substantial
NTSB Number
LAX93LA151
DURING FLIGHT AT 8000 FEET, THE ENGINE LOST POWER. THE PILOT TRIED TO MAKE A FORCED LANDING AT LAKE HAVASU AIRPORT, BUT WAS UNABLE TO REACH THE AIRPORT. HE SELECTED A ROADWAY ABOUT 2 1/2 MILES SOUTH OF THE AIRPORT. DURING THE FINAL APPROACH TO THE ROADWAY, THE AIRPLANE STRUCK A VEHICLE. A METALLURGICAL EXAMINATION REVEALED THAT THE NUMBER TWO CYLINDER'S INBOARD BOSS HAD BEEN WELDED. THE WELD REPAIR IS SPECIFICALLY PROHIBITED BY TELEDYNE CONTINENTAL MOTORS SPECIFICATION MHS 217. THIS UNAPPROVED WELD LED TO SIGNIFICANT SOFTENING OF THE INBOARD BOSS, AND A REDUCTION OF FATIGUE STRENGTH. THE AIRPLANE RECORDS REVEALED THAT THE CYLINDERS HAD BEEN PURCHASED AT A AUCTION, AND THE CYLINDER'S MAINTENANCE HISTORY IS UNKNOWN. THE AIRPLANE RECORDS DID NOT REFLECT THAT ANY WELDING REPAIRS WERE PERFORMED ON THE NUMBER TWO CYLINDER.
NTSB Probable Cause
THE IMPROPER WELDING OF THE INBOARD BOSS BY AN UNKNOWN PERSON RESULTING IN A FATIGUE FAILURE ON THE INBOARD BOSS. A FACTOR RELATED TO THE ACCIDENT WAS THE VEHICLE THAT WAS STRUCK DURING THE FORCED LANDING.
Full Narrative
DURING FLIGHT AT 8000 FEET, THE ENGINE LOST POWER. THE PILOT TRIED TO MAKE A FORCED LANDING AT LAKE HAVASU AIRPORT, BUT WAS UNABLE TO REACH THE AIRPORT. HE SELECTED A ROADWAY ABOUT 2 1/2 MILES SOUTH OF THE AIRPORT. DURING THE FINAL APPROACH TO THE ROADWAY, THE AIRPLANE STRUCK A VEHICLE. A METALLURGICAL EXAMINATION REVEALED THAT THE NUMBER TWO CYLINDER'S INBOARD BOSS HAD BEEN WELDED. THE WELD REPAIR IS SPECIFICALLY PROHIBITED BY TELEDYNE CONTINENTAL MOTORS SPECIFICATION MHS 217. THIS UNAPPROVED WELD LED TO SIGNIFICANT SOFTENING OF THE INBOARD BOSS, AND A REDUCTION OF FATIGUE STRENGTH. THE AIRPLANE RECORDS REVEALED THAT THE CYLINDERS HAD BEEN PURCHASED AT A AUCTION, AND THE CYLINDER'S MAINTENANCE HISTORY IS UNKNOWN. THE AIRPLANE RECORDS DID NOT REFLECT THAT ANY WELDING REPAIRS WERE PERFORMED ON THE NUMBER TWO CYLINDER.
Flight
Event TypeAccident
Event Time20:00 MST
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireIflt
Aircraft ExplosionIflt
Aircraft
AircraftCessna 182
Tail NumberN466KT
Aircraft CategoryAir
DamageSubstantial
OperatorM Kent Christopherson
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsContinental · O-470-R · Reciprocating · 230
Seats4
People & Injuries
Injury SummaryNo injuries (4 uninjured, 1 unknown outcome)
Fatal0
Serious0
Minor0
Uninjured4
Total5
Crew 1Age 58 · First Class
Conditions
ConditionsVMC
LightDark Night
Wind70° @ 6 kt
Visibility40 sm
CeilingNone
Temperature / Dew Point66 F / 43 C
Altimeter29.00 inHg
Observation Time02:50
Weather SourceWFAC