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NTSB Report
September 24, 1985 · Hiller UH-12D · N67182
Breese, IL
Overview
Report Status
Preliminary report
Event Type
Accident
Date
September 24, 1985
Injury Outcomes
No injuries (1 uninjured)
Location
Breese, IL
Aircraft
Hiller UH-12D
Tail Number
N67182
Operator
Illini Helicopter Service
Injuries
None
Aircraft Damage
Substantial
NTSB Number
CHI85FEV04
THE PLT REPORTED THAT THE ENG BEGAN LOSING POWER WHILE HE WAS EN ROUTE AT AN ALT OF APRX 200 FT AGL. HE TURNED & INITIATED AN AUTOROTATION TO A ROAD CONSTRUCTION SITE. THE HELICOPTER LANDED TAIL LOW. SUBSEQUENTLY, THE TAIL BOOM WAS CHOPPED OFF & THE HELICOPTER BOUNCED & ROTATED 180 DEG. AN EXAM OF THE ENG REVEALED THE #4 PISTON HAD FAILED. THE PISTON HAD BURNT & MOLTEN ALUMINUM HAD TRANSFERRED TO THE STEM OF THE EXHAUST VALVE CAUSING IT TO STICK OPEN.
Full Narrative
THE PLT REPORTED THAT THE ENG BEGAN LOSING POWER WHILE HE WAS EN ROUTE AT AN ALT OF APRX 200 FT AGL. HE TURNED & INITIATED AN AUTOROTATION TO A ROAD CONSTRUCTION SITE. THE HELICOPTER LANDED TAIL LOW. SUBSEQUENTLY, THE TAIL BOOM WAS CHOPPED OFF & THE HELICOPTER BOUNCED & ROTATED 180 DEG. AN EXAM OF THE ENG REVEALED THE #4 PISTON HAD FAILED. THE PISTON HAD BURNT & MOLTEN ALUMINUM HAD TRANSFERRED TO THE STEM OF THE EXHAUST VALVE CAUSING IT TO STICK OPEN.
Flight
Event TypeAccident
Event Time07:15 CDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftHiller UH-12D
Tail NumberN67182
Aircraft CategoryHeli
DamageSubstantial
OperatorIllini Helicopter Service
Operating RulePart 137
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · VO-435-A1C · Reciprocating · 260
Seats3
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 36 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind180° @ 4 kt
Visibility15 sm
CeilingNone
Temperature / Dew Point45 C / 0 C
Altimeter30.00 inHg
Observation Time12:45
Weather SourceWFAC