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NTSB Report
November 28, 1986 · Mooney M20K · N3691H
Watertown, WI
Overview
Report Status
Preliminary report
Event Type
Accident
Date
November 28, 1986
Injury Outcomes
No injuries (2 uninjured)
Location
Watertown, WI
Aircraft
Mooney M20K
Tail Number
N3691H
Injuries
None
Aircraft Damage
Substantial
NTSB Number
CHI87LA037
FOLLOWING AN ENGINE POWER LOSS DUE TO FATIGUE OF THE #1 CYLINDER, THE PLT FORCE LANDED THE ACFT ON A HIGHWAY. THE HIGHWAY WAS THE ONLY AVAILABLE LANDING AREA, ACCORDING TO THE PLT. ON LANDING ROLLOUT, THE PLT WAS FORCED TO SWERVE THE ACFT OFF THE PAVED SURFACE TO AVOID ON COMING VEHICULAR TRAFFIC. THE ACFT STRUCK TWO TRAFFIC SIGNS AND SUBSEQUENTLY WENT INTO A DITCH ALONG THE SIDE OF THE ROAD. ALTHOUGH THE SYLINDER APPEARED TO HAVE BEEN PROPERLY MANUFACTURED, ACCORDING TO TELEDYNE CONTINENTAL METALLURGICAL DATA THE ISOLATED LOCATION OF THE FATIGUE POINTS AND THE ABSENCE OF OTHER POSSIBLE CAUSES OF THE CYLINDER FAILURE INDICATE THAT A MANUFACTURING DEFECT EXISTED.
Full Narrative
FOLLOWING AN ENGINE POWER LOSS DUE TO FATIGUE OF THE #1 CYLINDER, THE PLT FORCE LANDED THE ACFT ON A HIGHWAY. THE HIGHWAY WAS THE ONLY AVAILABLE LANDING AREA, ACCORDING TO THE PLT. ON LANDING ROLLOUT, THE PLT WAS FORCED TO SWERVE THE ACFT OFF THE PAVED SURFACE TO AVOID ON COMING VEHICULAR TRAFFIC. THE ACFT STRUCK TWO TRAFFIC SIGNS AND SUBSEQUENTLY WENT INTO A DITCH ALONG THE SIDE OF THE ROAD. ALTHOUGH THE SYLINDER APPEARED TO HAVE BEEN PROPERLY MANUFACTURED, ACCORDING TO TELEDYNE CONTINENTAL METALLURGICAL DATA THE ISOLATED LOCATION OF THE FATIGUE POINTS AND THE ABSENCE OF OTHER POSSIBLE CAUSES OF THE CYLINDER FAILURE INDICATE THAT A MANUFACTURING DEFECT EXISTED.
Flight
Event TypeAccident
Event Time17:35 CST
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftMooney M20K
Tail NumberN3691H
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsContinental · TSIO-360-GB1 · Reciprocating · 210
Seats4
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 23 · First Class
Conditions
ConditionsVMC
LightDark Night
Wind250° @ 5 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point36 C / 30 C
Altimeter30.00 inHg
Observation Time23:50
Weather SourceWFAC