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NTSB Report
May 24, 1985 · Mooney M20 · N853B
Hamilton, TX
Overview
Report Status
Preliminary report
Event Type
Accident
Date
May 24, 1985
Injury Outcomes
1 injury (1 serious injury)
Location
Hamilton, TX
Aircraft
Mooney M20
Tail Number
N853B
Injuries
Serious
Aircraft Damage
Destroyed
NTSB Number
FTW85LA233
THE PLT STATED THE ACFT AND ENGINE ASSY HAD EXPERIENCED EXECSSIVE VIBRATIONS WHILE IN FLT FOLLOWED BY THE WINDSHIELD BEING COVERED WITH OIL IMMEDIATELY AFTER THE VIBRATION STARTED. THE PROPELLER ASSY HAD BECOME LOOSE FROM THE ENGINE MOUNT AND SEPARATED AT IMPACT. ONLY ONE BOLT REMAINED ATTACHED AT IMPACT. METALLURGICAL EXAM INDICATED A LACK OF TORQUE WHICH ALLOWED VIBRATORY AND OTHER HIGH CYCLE STRESS TO BE FELT BY THE BOLTS THEREBY INITIATING AND PROPAGATING FATIQUE CRACKS.
Full Narrative
THE PLT STATED THE ACFT AND ENGINE ASSY HAD EXPERIENCED EXECSSIVE VIBRATIONS WHILE IN FLT FOLLOWED BY THE WINDSHIELD BEING COVERED WITH OIL IMMEDIATELY AFTER THE VIBRATION STARTED. THE PROPELLER ASSY HAD BECOME LOOSE FROM THE ENGINE MOUNT AND SEPARATED AT IMPACT. ONLY ONE BOLT REMAINED ATTACHED AT IMPACT. METALLURGICAL EXAM INDICATED A LACK OF TORQUE WHICH ALLOWED VIBRATORY AND OTHER HIGH CYCLE STRESS TO BE FELT BY THE BOLTS THEREBY INITIATING AND PROPAGATING FATIQUE CRACKS.
Flight
Event TypeAccident
Event Time09:35 CDT
Nearest AirportHamilton Municipal (1nm S)
Runway35
Runway Length3545 ft
Runway Width50 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftMooney M20
Tail NumberN853B
Aircraft CategoryAir
DamageDestroyed
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-320 · Reciprocating · 150
Seats4
People & Injuries
Injury Summary1 injury (1 serious injury)
Fatal0
Serious1
Minor0
Uninjured0
Total1
Crew 1Age 57 · Third Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility15 sm
CeilingNone
Temperature / Dew Point0 C
Altimeter0
Weather SourcePILO