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NTSB Report
August 16, 1989 · Hiller UH-12E · N7086
Tolleson, AZ
Overview
Report Status
Probable Cause
Event Type
Accident
Date
August 16, 1989
Injury Outcomes
1 injury (1 minor injury)
Location
Tolleson, AZ
Aircraft
Hiller UH-12E
Tail Number
N7086
Operator
Moseley Aviation
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
LAX89DUJ09
THE PILOT OF THE SPRAY HELICOPTER EXPERIENCED AN ENGINE FAILURE AFTER A TAKEOFF FROM A REFUELING STOP. THE AIRCRAFT AUTOROTATED INTO AN OPEN FIELD, BOUNCED AND ROLLED OVER INTO ITS SIDE. A FUEL SAMPLE TAKEN ON THE SAME DAY REVEALED THAT APPROXIMATELY 15% OF THE FUEL WAS WATER. A LATER TEST OF THE FUEL BY THE COMPANY REVEALED THAT CONTAMINATION WAS TWO QUARTS TO FIVE GALLONS OF FUEL. THE PILOT REPORTED NO MECHANICAL PROBLEMS WITH THE AIRCRAFT PRIOR TO THE ACCIDENT.
NTSB Probable Cause
AN ENGINE FAILURE DUE TO WATER CONTAMINATION IN THE FUEL SUPPLY WHICH PRECEDED AN AUTOROTATION AND COLLISION WITH THE GROUND DURING NIGHT TIME CONDITIONS.
Full Narrative
THE PILOT OF THE SPRAY HELICOPTER EXPERIENCED AN ENGINE FAILURE AFTER A TAKEOFF FROM A REFUELING STOP. THE AIRCRAFT AUTOROTATED INTO AN OPEN FIELD, BOUNCED AND ROLLED OVER INTO ITS SIDE. A FUEL SAMPLE TAKEN ON THE SAME DAY REVEALED THAT APPROXIMATELY 15% OF THE FUEL WAS WATER. A LATER TEST OF THE FUEL BY THE COMPANY REVEALED THAT CONTAMINATION WAS TWO QUARTS TO FIVE GALLONS OF FUEL. THE PILOT REPORTED NO MECHANICAL PROBLEMS WITH THE AIRCRAFT PRIOR TO THE ACCIDENT.
Flight
Event TypeAccident
Event Time04:30 MST
Nearest AirportCnty Boy Crop Dusting Arp (0nm N)
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftHiller UH-12E
Tail NumberN7086
Aircraft CategoryHeli
DamageSubstantial
OperatorMoseley Aviation
Operating RulePart 137
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · VO-540-C2A · Reciprocating · 305
Seats3
People & Injuries
Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 49 · Second Class
Conditions
ConditionsVMC
LightDark Night
Wind210° @ 5 kt
Visibility35 sm
CeilingNone
Temperature / Dew Point68 F
Altimeter0
Observation Time11:50
Weather SourceWFAC