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NTSB Report
February 23, 1987 · Bell 47G · N6330D
Sand Springs, OK
Overview
Report Status
Preliminary report
Event Type
Accident
Date
February 23, 1987
Injury Outcomes
No injuries (2 uninjured)
Location
Sand Springs, OK
Aircraft
Bell 47G
Tail Number
N6330D
Operator
Allied Helicopter Services
Injuries
None
Aircraft Damage
Substantial
NTSB Number
FTW87LA069
INSTRUCTOR PLT WAS DEMONSTRATING A CONFINED AREA TAKEOFF TO THE PVT PLT TAKING ADVANCE INSTRUCTION. AS THE ACFT CLEARED THE BARRIERS, THE QUARTERING HEAD WIND SHIFTED TO A TAIL WIND AND THE ACFT LOST TRANSLATIONAL LIFT. APPLICATION OF FULL POWER DID NOT REMEDY THE SITUATION AND THE ACFT LOST ROTOR RPM. ACFT SETTLED INTO THE TREES BEFORE THE INSTRUCTOR COULD REESTABLISH A CLIMB. A TAIL WIND WOULD SUBSTANTIALLY INCREASE THE POWER REQUIREMENT FOR THE MANEUVER THAT WAS BEING ATTEMPTED.
Full Narrative
INSTRUCTOR PLT WAS DEMONSTRATING A CONFINED AREA TAKEOFF TO THE PVT PLT TAKING ADVANCE INSTRUCTION. AS THE ACFT CLEARED THE BARRIERS, THE QUARTERING HEAD WIND SHIFTED TO A TAIL WIND AND THE ACFT LOST TRANSLATIONAL LIFT. APPLICATION OF FULL POWER DID NOT REMEDY THE SITUATION AND THE ACFT LOST ROTOR RPM. ACFT SETTLED INTO THE TREES BEFORE THE INSTRUCTOR COULD REESTABLISH A CLIMB. A TAIL WIND WOULD SUBSTANTIALLY INCREASE THE POWER REQUIREMENT FOR THE MANEUVER THAT WAS BEING ATTEMPTED.
Flight
Event TypeAccident
Event Time13:45 CST
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBell 47G
Tail NumberN6330D
Aircraft CategoryHeli
DamageSubstantial
OperatorAllied Helicopter Services
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsFranklin · 6VS-335 SER · Reciprocating · 200
Seats2
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 38 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind170° @ 13 kt
Visibility15 sm
CeilingNone
Temperature / Dew Point55 / 30 C
Altimeter30.00 inHg
Observation Time19:52
Weather SourceWFAC