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NTSB Report
May 20, 1993 · Hiller UH-12C · N46937
Sarasota, FL
Overview
Report Status
Probable Cause
Event Type
Accident
Date
May 20, 1993
Injury Outcomes
No injuries (2 uninjured)
Location
Sarasota, FL
Aircraft
Hiller UH-12C
Tail Number
N46937
Operator
Jocher Arthur H
Injuries
None
Aircraft Damage
Substantial
NTSB Number
MIA93LA125
THE COMMERCIAL PILOT WAS IN CRUISE FLIGHT AT ABOUT 400 FEET AGL WHEN HE OBSERVED A SUDDEN DROP IN ENGINE RPM FOLLOWED BY AN INCREASE IN RPM. THE PILOT INITIATED A FORCED LANDING BY ENTERING AN AUTOROTATION. DURING THE DECELERATION THE HELICOPTER COLLIDED WITH POWER LINES AND CRASHED. REVIEW OF THE HELICOPTER LOGBOOKS REVEALED THE CARBURETOR FLOAT ASSEMBLY HAD NOT BEEN CHANGED, AND NUMEROUS SERVICE BULLETIN PROCEDURES PERTAINING TO THE MA 4-5 CARBURETOR HAD NOT BEEN PERFORMED. DISASSEMBLY INSPECTION OF THE CARBURETOR REVEALED THE CARBURETOR WAS CONTAMINATED. SAND WAS PRESENT IN THE CARBURETOR BOWL, THE FUEL INLET ASSEMBLY WAS DIRTY AND THE PUMP PLUNGER ASSEMBLY WAS RUSTY.
NTSB Probable Cause
THE PILOT-IN-COMMAND'S IMPROPER APPLICATION OF THE FLIGHT CONTROLS DURING AN AUTOROTATIVE LANDING, RESULTING IN AN IN-FLIGHT COLLISION WITH WIRES AND TERRAIN. CONTRIBUTING TO THE ACCIDENT WAS THE IMPROPER INSPECTION OF THE ENGINE FUEL SYSTEM (CARBURETOR) BY MAINTENANCE PERSONNEL, RESULTING IN A CONTAMINATED CARBURETOR AND A PARTIAL LOSS OF ENGINE POWER WHILE IN CRUISE FLIGHT.
Full Narrative
THE COMMERCIAL PILOT WAS IN CRUISE FLIGHT AT ABOUT 400 FEET AGL WHEN HE OBSERVED A SUDDEN DROP IN ENGINE RPM FOLLOWED BY AN INCREASE IN RPM. THE PILOT INITIATED A FORCED LANDING BY ENTERING AN AUTOROTATION. DURING THE DECELERATION THE HELICOPTER COLLIDED WITH POWER LINES AND CRASHED. REVIEW OF THE HELICOPTER LOGBOOKS REVEALED THE CARBURETOR FLOAT ASSEMBLY HAD NOT BEEN CHANGED, AND NUMEROUS SERVICE BULLETIN PROCEDURES PERTAINING TO THE MA 4-5 CARBURETOR HAD NOT BEEN PERFORMED. DISASSEMBLY INSPECTION OF THE CARBURETOR REVEALED THE CARBURETOR WAS CONTAMINATED. SAND WAS PRESENT IN THE CARBURETOR BOWL, THE FUEL INLET ASSEMBLY WAS DIRTY AND THE PUMP PLUNGER ASSEMBLY WAS RUSTY.
Flight
Event TypeAccident
Event Time16:18 EDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftHiller UH-12C
Tail NumberN46937
Aircraft CategoryHeli
DamageSubstantial
OperatorJocher Arthur H
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsFranklin · 6V335 · Reciprocating · 210
Seats3
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 46 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind260° @ 9 kt
CeilingNone
Temperature / Dew Point70 F
Altimeter29.00 inHg
Observation Time19:47
Weather SourceWFAC