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NTSB Report
March 18, 1991 · Mooney M20D · N1921Y
Herlong, CA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
March 18, 1991
Injury Outcomes
No injuries (3 uninjured)
Location
Herlong, CA
Aircraft
Mooney M20D
Tail Number
N1921Y
Operator
Marlyn R Taylor
Injuries
None
Aircraft Damage
Substantial
NTSB Number
LAX91LA135
THE AIRCRAFT HAD BEEN IN CRUISE FLIGHT AT AN ALTITUDE OF 7500 FEET MSL FOR TWO AND A HALF HOURS WHEN A BLADE SEPARATED FROM THE FIXED PITCH PROPELLER. THE PILOT SECURED THE ENGINE, STOPPED THE ROTATION OF THE PROPELLER AND LANDED ON A ROAD WITHOUT FURTHER INCIDENT. A POST ACCIDENT ANALYSIS OF THE PROPELLER FAILURE DISCLOSED A FATIGUE CRACK EMANATED FROM A CORROSION AREA ON THE CAMBER SIDE OF THE BLADE.
NTSB Probable Cause
THE INADEQUATE PREPARATION OF THE PROPELLER DURING OVERHAUL. THE INSTALLATION OF AN IMPROPER PITCHED PROPELLER AND THE FATIGUE FAILURE OF THE PROPELLER BLADE EMANATING FROM CORROSION WERE FACTORS IN THE ACCIDENT.
Full Narrative
THE AIRCRAFT HAD BEEN IN CRUISE FLIGHT AT AN ALTITUDE OF 7500 FEET MSL FOR TWO AND A HALF HOURS WHEN A BLADE SEPARATED FROM THE FIXED PITCH PROPELLER. THE PILOT SECURED THE ENGINE, STOPPED THE ROTATION OF THE PROPELLER AND LANDED ON A ROAD WITHOUT FURTHER INCIDENT. A POST ACCIDENT ANALYSIS OF THE PROPELLER FAILURE DISCLOSED A FATIGUE CRACK EMANATED FROM A CORROSION AREA ON THE CAMBER SIDE OF THE BLADE.
Flight
Event TypeAccident
Event Time16:30 PST
Nearest Airport0nm N
Runway0
Flight Plan FiledVFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftMooney M20D
Tail NumberN1921Y
Aircraft CategoryAir
DamageSubstantial
OperatorMarlyn R Taylor
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · 0360 · Reciprocating · 180
Seats4
People & Injuries
Injury SummaryNo injuries (3 uninjured)
Fatal0
Serious0
Minor0
Uninjured3
Total3
Crew 1Age 41 · First Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility50 sm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0
Weather SourcePILO