ASN Wikibase Occurrence # 365524
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| Date: | Sunday 31 March 1991 |
| Time: | 09:15 LT |
| Type: |  Bell 47G-2A |
| Owner/operator: | Waitsburg Helicopter Service |
| Registration: | N38926 |
| MSN: | NAH 1957-1 |
| Engine model: | LYCOMING VO-435A1F |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Waitsburg, WA -
 United States of America
|
| Phase: | Landing |
| Nature: | Agricultural |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
WHILE THE PILOT WAS LOWERING THE COLLECTIVE PITCH AFTER LANDING TOUCHDOWN, THE MAIN ROTOR SEPARATED FROMT HE MAST. THE EXAMINATION REVEALED THE IMPROPER INSTALLATION OF THE MAST NUT AND LOCK WASHER WHEN THE MAIN ROTOR WAS INSTALLED.
Probable Cause: THE IMPROPER INSTALLATION OF THE MAIN ROTOR MAST NUT AND LOCK WASHER BY MAINTENANCE PERSONNEL WHICH RESULTED IN THE SEPARATION OF THE MAIN ROTOR SYSTEM.
Accident investigation:
 |
|
Sources:
NTSB SEA91LA077
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 20-Mar-2024 11:03 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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