- Date
- February 23, 1987, 13:45 local (19:45 UTC)
- Place
- Sand Springs, OK
- Injuries
- 2 uninjured
- Damage
- Substantial damage
- Phase of flight
- Initial climb
- Aircraft
- N6330DBell 47G
- Weather
- Visual (VMC) · Day
- Status
- Completed · report May 2, 1988
- Report
- Approved by Office Director
- FAA report
- 19870223003169A
- Case key
- 22333
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
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Sequence of events
NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.
Analysis
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.
Aircraft
- Registration
- N6330D
- Reported as
- Bell 47G
- Category
- Helicopter
- Serial number
- 1044
- Airframe hours
- 6,480
- Engine
- Franklin 6VS-335 SER, 200 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Instructional · Part 91
- Operator
- Allied Helicopter Services,Inc
- Registered owner
- Allied Helicopter Services Inc
- Airworthiness certificate
- Standard, Normal
- Last inspection
- Annual · August 12, 1986 · 172 hours before
- Departed
- 5F2 · Tulsa, OK
Flight crew
As NTSB recorded them. NTSB leaves out names.
- Role
- Pilot
- Age
- 38
- Certificates
- Commercial, Flight instructor
- Airplane ratings
- Single-engine land
- Instrument ratings
- Helicopter, Airplane
- Medical
- Class 2, Valid Medical--no waivers/lim.
- Seat
- Left
- Flight hours
- 5,099 total · 237 in this make and model · 4,725 as pilot in command · 86 in the last 90 days · 1 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 170° at 13 knots
- Visibility
- 15 statute miles
- Lowest ceiling
- None
- Temperature
- 55 °F, dew point 30 °F
- Altimeter
- 30.00 inHg
- Observed at
- TUL, 15 nm away
FAA reports on this event · 1
The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.