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NTSB Report
July 31, 1986 · Cessna 150H · N50101
Bartlesville, OK
Overview
Report Status
Preliminary report
Event Type
Accident
Date
July 31, 1986
Injury Outcomes
1 injury (1 minor injury)
Location
Bartlesville, OK
Aircraft
Cessna 150H
Tail Number
N50101
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
FTW86LA141
THE PLT TOOK OFF ON A TEST FLT AFTER AN ANNUAL INSPN OF THE ACFT & A TOP OVERHAUL OF THE ENG HAD BEEN COMPLETED. WHILE CLIMBING THRU ABOUT 1200 TO 1300 FT AGL, THE ENG STARTED RUNNING ROUGH, THEN QUIT. THE PLT ATTEMPTED TO RETURN TO THE ARPT, BUT WAS UNABLE. SUBSEQUENTLY, SHE LANDED THE ACFT IN AN AREA OF DENSE BRUSH & TREES. AN INV REVEALED THAT THE ROCKER ARM SUPPORT STRUCTURE ON THE #3 CYLINDER HAD FAILED, RELEASING THE ROCKER ARM SHAFT & BOTH ROCKER ARMS. TEARDOWN OF THE ENG REVEALED THAT THE #3 EXHAUST VALVE GUIDE WAS AN INCORRECT PART & WAS OVERSIZE IN LENGTH BY 0.165 INCH. THE OVERSIZE GUIDE WOULD NOT ALLOW FULL VALVE MOVEMENT & THE RESIDUAL MOVEMENT RESULTED IN FAILURE OF THE ROCKER ARM SUPPORT STRUCTURE.
Full Narrative
THE PLT TOOK OFF ON A TEST FLT AFTER AN ANNUAL INSPN OF THE ACFT & A TOP OVERHAUL OF THE ENG HAD BEEN COMPLETED. WHILE CLIMBING THRU ABOUT 1200 TO 1300 FT AGL, THE ENG STARTED RUNNING ROUGH, THEN QUIT. THE PLT ATTEMPTED TO RETURN TO THE ARPT, BUT WAS UNABLE. SUBSEQUENTLY, SHE LANDED THE ACFT IN AN AREA OF DENSE BRUSH & TREES. AN INV REVEALED THAT THE ROCKER ARM SUPPORT STRUCTURE ON THE #3 CYLINDER HAD FAILED, RELEASING THE ROCKER ARM SHAFT & BOTH ROCKER ARMS. TEARDOWN OF THE ENG REVEALED THAT THE #3 EXHAUST VALVE GUIDE WAS AN INCORRECT PART & WAS OVERSIZE IN LENGTH BY 0.165 INCH. THE OVERSIZE GUIDE WOULD NOT ALLOW FULL VALVE MOVEMENT & THE RESIDUAL MOVEMENT RESULTED IN FAILURE OF THE ROCKER ARM SUPPORT STRUCTURE.
Flight
Event TypeAccident
Event Time09:20 CDT
Nearest Airport1nm SSW
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna 150H
Tail NumberN50101
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsContinental · O-200-A · Reciprocating · 100
Seats2
People & Injuries
Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 67 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind360° @ 10 kt
Visibility5 sm
CeilingBroken clouds 2000 ft
Altimeter29.00 inHg
Observation Time14:52
Weather SourceWFAC