ASN Wikibase Occurrence # 278496
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| Date: | Wednesday 29 September 2021 |
| Time: | 11:00 LT |
| Type: |  Eurocopter AS 350B3 |
| Owner/operator: | State of North Carolina |
| Registration: | N370NC |
| MSN: | 4379 |
| Year of manufacture: | 2008 |
| Total airframe hrs: | 1098 hours |
| Engine model: | Turbomeca Arrie2B1 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Kinston, North Carolina -
 United States of America
|
| Phase: | Landing |
| Nature: | Training |
| Departure airport: | Kinston, NC |
| Kinston, NC | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that he was on a pre-checkride flight and was conducting standard maneuvers as required by the commercial helicopter practical test standards. The flight was uneventful and lasted about an hour. He stated that, during the flight, 'we had no hard landings or turbulence;†however, on the postflight checks he immediately noticed buckled metal on the tail boom near the fuselage attachment points. He said he noticed small dents on the bottom and sides of the tail boom when he first flew this helicopter in 2019; however, they were small and were checked pre- and postflight without signs of growth until this flight.
An examination and review of the tail boom section by an Airbus representative and NTSB structural engineer noted wrinkled skin damage on the tail boom. Both Airbus and the NTSB agreed that this was very similar to cases in which the tail boom structure has been subjected to loads above the design load. As a result, the tail boom was permanently deformed and the structural strength was compromised, most likely from a hard landing event. The buckling of the lower portion of a semi-monocoque structure such as the tail boom is considered substantial damage since it adversely affects the structural strength and requires major repair or replacement. The exact time and date of the hard landing was not determined.
Probable Cause: The buckling of the tail boom as a result of a hard landing event of undetermined time and location.
Accident investigation:
 |
|
Sources:
NTSB ERA21LA390
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 30-May-2022 11:07 | ASN Update Bot | Added |
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