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NTSB Report
May 6, 1989 · Bell 47L · N6330D
Tulsa, OK
Overview
Report Status
Probable Cause
Event Type
Accident
Date
May 6, 1989
Injury Outcomes
No injuries (2 uninjured)
Location
Tulsa, OK
Aircraft
Bell 47L
Tail Number
N6330D
Operator
Allied Helicopters
Injuries
None
Aircraft Damage
Substantial
NTSB Number
FTW89LA092
THE INSTRUCTOR PILOT SAID HE AND A BEGINNER STUDENT WERE IN A HOVER PRACTICE AREA AND WERE REPOSITIONING THE HELICOPTER TO ALLOW ANOTHER HELICOPTER TO HOVER OUT FROM THE RAMP. HE SAID HE ALLOWED THE STUDENT TO FOLLOW HIM ON THE CONTROLS, AND DURING THE HOVER LANDING, A GUST OF WIND CAUSED THE TAIL TO PITCH UP. AN UNEXPECTED CONTROL INPUT BY THE STUDENT CAUSED AN OVERCORRECTION WHICH ALLOWED THE TAIL ROTOR TO STRIKE THE GROUND. THERE WAS DAMAGE TO THE TAIL ROTOR, THE SKIDS, AND THE BUBBLE CANOPY.
NTSB Probable Cause
INADEQUATE SUPERVISION OF THE STUDENT BY THE INSTRUCTOR IN THAT HE ALLOWED THE STUDENT TO OVERPOWER HIS CONTROL INPUTS AFTER AN UNEXPECTED GUST OF WIND MOVED THE TAIL OF THE HELICOPTER.
Full Narrative
THE INSTRUCTOR PILOT SAID HE AND A BEGINNER STUDENT WERE IN A HOVER PRACTICE AREA AND WERE REPOSITIONING THE HELICOPTER TO ALLOW ANOTHER HELICOPTER TO HOVER OUT FROM THE RAMP. HE SAID HE ALLOWED THE STUDENT TO FOLLOW HIM ON THE CONTROLS, AND DURING THE HOVER LANDING, A GUST OF WIND CAUSED THE TAIL TO PITCH UP. AN UNEXPECTED CONTROL INPUT BY THE STUDENT CAUSED AN OVERCORRECTION WHICH ALLOWED THE TAIL ROTOR TO STRIKE THE GROUND. THERE WAS DAMAGE TO THE TAIL ROTOR, THE SKIDS, AND THE BUBBLE CANOPY.
Flight
Event TypeAccident
Event Time10:30 CDT
Nearest AirportDowntown Airpark (0nm N)
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBell 47L
Tail NumberN6330D
Aircraft CategoryHeli
DamageSubstantial
OperatorAllied Helicopters
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsFranklin · 6V-335-A · Reciprocating · 210
Seats2
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 40 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind270° @ 10 kt, gusting 15 kt
Visibility20 sm
CeilingNone
Temperature / Dew Point0 C
Altimeter0
Weather SourcePILO