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NTSB Report
March 13, 1989 · Hughes 269C · N300PP
Bexley, OH
Overview
Report Status
Probable Cause
Event Type
Accident
Date
March 13, 1989
Injury Outcomes
No injuries (2 uninjured)
Location
Bexley, OH
Aircraft
Hughes 269C
Tail Number
N300PP
Injuries
None
Aircraft Damage
Substantial
NTSB Number
ATL89LA100
THE HELICOPTER WAS IN CRUISE FLIGHT AT 500 FEET AGL WHEN THE ENGINE QUIT WITHOUT WARNING. AN AUTOROTATION WAS EXECUTED TO AN OPEN FIELD. THE TAILBOOM WAS SEVERED BY THE MAIN ROTOR BLADES. POST ACCIDENT EXAMINATION OF THE ENGINE REVEALED THE NO. 1 CYLINDER EXHAUST VALVE FAILED.FURTHER INVESTIGATION REVEALED THE ENGINE HAD BEEN DAMAGED PREVIOUSLY OVERSPED ABOUT 60 HOURS PRIOR THE EXHAUST VALVE FAILURE. ENGINE MAINTENANCE RECORDS CONTAINED NO EVIDENCE OF AN OVERSPEED INSPECTION BUT DID REVEAL THAT THE NO. 2 CYLINDER WAS REMOVED BECAUSE OF OIL FOULING. THE ENGINE WAS OPERATED TWO TENTHS OF AN HOUR AFTER REPLACEMENT OF THE CYLINDER AND SUFFERED FAILURE OF THE NO. 1 CYLINDER EXHAUST VALVE.
NTSB Probable Cause
THE INADEQUATE MAINTENANCE INSPECTION OF THE ENGINE FOLLOWING EVIDENCE OF PREVIOUS DAMAGE WHICH LED TO THE FAILURE OF THE NO. 1 CYLINDER EXHAUST VALVE.
Full Narrative
THE HELICOPTER WAS IN CRUISE FLIGHT AT 500 FEET AGL WHEN THE ENGINE QUIT WITHOUT WARNING. AN AUTOROTATION WAS EXECUTED TO AN OPEN FIELD. THE TAILBOOM WAS SEVERED BY THE MAIN ROTOR BLADES. POST ACCIDENT EXAMINATION OF THE ENGINE REVEALED THE NO. 1 CYLINDER EXHAUST VALVE FAILED.FURTHER INVESTIGATION REVEALED THE ENGINE HAD BEEN DAMAGED PREVIOUSLY OVERSPED ABOUT 60 HOURS PRIOR THE EXHAUST VALVE FAILURE. ENGINE MAINTENANCE RECORDS CONTAINED NO EVIDENCE OF AN OVERSPEED INSPECTION BUT DID REVEAL THAT THE NO. 2 CYLINDER WAS REMOVED BECAUSE OF OIL FOULING. THE ENGINE WAS OPERATED TWO TENTHS OF AN HOUR AFTER REPLACEMENT OF THE CYLINDER AND SUFFERED FAILURE OF THE NO. 1 CYLINDER EXHAUST VALVE.
Flight
Event TypeAccident
Event Time07:20 EST
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftHughes 269C
Tail NumberN300PP
Aircraft CategoryHeli
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · HIO-360-D1A · Reciprocating · 200
Seats2
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 29 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind110° @ 5 kt
Visibility7 sm
CeilingBroken clouds 25000 ft
Temperature / Dew Point28 C / 25 C
Altimeter30.00 inHg
Observation Time11:50
Weather SourceWFAC