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NTSB Report
June 4, 1994 · Hiller FH1100 · N746FH
Tyonek, AK
Overview
Report Status
Final with probable cause
Event Type
Accident
Date
June 4, 1994
Injury Outcomes
No injuries (4 uninjured)
Location
Tyonek, AK
Aircraft
Hiller FH1100
Tail Number
N746FH
Injuries
None
Aircraft Damage
Substantial
NTSB Number
ANC94LA064
THE PILOT STATED HE LANDED ON THE RIVER BANK, AND AFTER REDUCING COLLECTIVE TO FLAT PITCH, THE RIVER BANK 'SLOUGHED OFF' UNDER THE RIGHT SKID, AND THE HELICOPTER ROLLED OVER ONTO ITS RIGHT SIDE INTO THE THEODORE RIVER. HE STATED HE HAD ALREADY REDUCED POWER AND WAS UNABLE TO CORRECT FOR THE ROLL RATE DUE TO DYNAMIC ROLLOVER.
NTSB Probable Cause
THE PILOT'S SELECTION OF UNSUITABLE TERRAIN FOR LANDING WHICH RESULTED IN A DYNAMIC ROLLOVER. A FACTOR WAS THE SOFT LANDING AREA SELECTED.
Full Narrative
On June 3, 1994, at 2030 Alaska daylight time, a Hiller FH- 1100 helicopter, N746FH, rolled onto its side, into the water after landing on a river bank located on the Theodore River near Beluga, Alaska. The personal flight was conducted under 14 CFR 91 in visual meteorological conditions. The flight departed from Lake Hood with a stop at Alexander Creek. No flight plan was filed. The Pilot-in-Command and all three passengers were uninjured and the aircraft was substantially damaged. According to the Pilot-in-Command, he reduced collective to flat pitch after landing on the river bank and the river bank "sloughed off" under the right skid. He stated the helicopter rolled onto its side and he did not have enough control to counter the roll.
Flight
Event TypeAccident
Event Time20:30 AKDT
Nearest Airport0nm
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftHiller FH1100
Tail NumberN746FH
Aircraft CategoryHeli
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeTurboshaft
Engine DetailsAllison · 250-C18 · Turboshaft · 317
Seats5
People & Injuries
Injury SummaryNo injuries (4 uninjured)
Fatal0
Serious0
Minor0
Uninjured4
Total4
Crew 1Age 68 · Third Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility90 sm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0