ASN Wikibase Occurrence # 295500
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| Date: | Sunday 20 July 2003 |
| Time: | 00:30 LT |
| Type: |  Bell 47G-2A |
| Owner/operator: | Johns Aerial Spraying |
| Registration: | N4774S |
| MSN: | WAV182 |
| Year of manufacture: | 1965 |
| Total airframe hrs: | 2800 hours |
| Engine model: | Lycoming VO-435-A1F |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Porterville, California -
 United States of America
|
| Phase: | Unknown |
| Nature: | Agricultural |
| Departure airport: | Porterville, CA |
| Porterville, CA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During an agricultural spray flight, when the helicopter's drive system disconnected from the engine, the helicopter yawed and descended about 10 feet into the underlying cotton field. The helicopter rolled upon impacting the uneven terrain. Prior to the event, the pilot heard the transmission make a loud noise and the engine oversped. The helicopter's drive system was examined, and 12 bolts on the planetary gear flange were found broken due to fatigue.
Probable Cause: Fatigue-induced failure of bolts in the helicopter's rotor drive flange, which resulted in a total loss of torque to the rotor drive shaft.
Accident investigation:
 |
|
Sources:
NTSB LAX03LA236
History of this aircraft
Other occurrences involving this aircraft
| 27 February 2015 | N4774S | Barton Aero Inc | 0 | Northeast of Ivanhoe, Tulare County, California | |
sub |
| Collision with pole or wires | ||||||
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Oct-2022 09:14 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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