ASN Wikibase Occurrence # 368798
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| Date: | Friday 12 May 1989 |
| Time: | 16:00 LT |
| Type: | Bell 47 |
| Owner/operator: | L. Lanier |
| Registration: | N908B |
| MSN: | 479 |
| Year of manufacture: | 1952 |
| Engine model: | LYCOMING VO-435-A1B |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Shelbyville, TN -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Agricultural |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
INVESTIGATION REVEALED THAT THE HELICOPTER WAS ENGAGED IN AERIAL APPLICATION. DURING A PROCEDURE TURN AROUND THERE WAS A LOUD EXPLOSIVE NOISE & ENGINE RPM EXCEEDED ROTOR RPM. THE PILOT REDUCED THE THROTTLE & TRIED TO ENTER AN AUTOROTATION. ROTOR RPM HAD DECAYED & A HARD LANDING RESULTED. MOST PROBABLE CAUSE FOR THE LOSS OF ROTOR RPM WAS A DISCONNECT BETWEEN THE ENGINE & THE MAIN ROTOR FOR UNKNOWN REASONS.
Probable Cause: FAILURE IN THE ROTOR DRIVE SYSTEM FOR UNKNOWN REASONS. CONTRIBUTING TO THE ACCIDENT WAS THE PILOT'S INABILITY TO PERFORM AN AUTOROTATION.
Accident investigation:
 |
|
Sources:
NTSB ATL89DLT03
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Mar-2024 07:34 | ASN Update Bot | Added |
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