- Date
- September 14, 1991, 11:30 local (21:30 UTC)
- Place
- Keaau, HI
- Injuries
- 2 minor, 1 uninjured
- Damage
- Substantial damage
- Phase of flight
- Landing
- Aircraft
- N6708DBell 47G2
- Weather
- Visual (VMC) · Day
- Status
- Completed · report March 24, 1993
- Report
- Approved by Office Director
- FAA report
- 19910914042799A
- Case key
- 27367
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
Probable cause
The pilot's landing hard. A contributing factor in this accident was the aircraft emitting a vibration from an unknown source.
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
While flying, the pilot felt a vibration and he performed a precautionary landing. The pilot landed the aircraft hard. The aircraft was removed without NTSB authorization and consequently it could not be examined. The pilot did not provide the NTSB a completed 'aircraft accident report' form 6120.1. The origin of the reported vibration was not determined.
Aircraft
- Registration
- N6708D
- Reported as
- Bell 47G2
- Category
- Helicopter
- Serial number
- 2189
- Engine
- Lycoming VO-540-B1B, 240 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Business · Part 91
- Operator
- Koinoa Aviation
- Last inspection
- Unknown · January 2, 2000
- Departed
- ITO · Hilo, HI
- Flight plan
- Company VFR
Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.
Flight crew
As NTSB recorded them. NTSB leaves out names.
- Role
- Pilot
- Age
- 30
- Certificate
- Commercial
- Airplane ratings
- Single-engine land, Multi-engine land
- Instrument ratings
- Airplane
- Medical
- Class 2, Valid Medical--no waivers/lim.
- Flight hours
- 6,400 total
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 20° at 7 knots
- Visibility
- 15 statute miles
- Lowest ceiling
- None
- Observed at
- ITO, 1 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.
Other investigations on N6708D · 5
Matched to the same aircraft by N-number and date.