ASN Wikibase Occurrence # 195300
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| Date: | Wednesday 10 May 2017 |
| Time: | 14:00 LT |
| Type: |  Enstrom 480B |
| Owner/operator: | private |
| Registration: | N480W |
| MSN: | 5110 |
| Year of manufacture: | 2007 |
| Total airframe hrs: | 300 hours |
| Engine model: | Rolls-Royce 250-C20W |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | near Fundres (Bolzano) -
 Italy
|
| Phase: | En route |
| Nature: | Ferry/positioning |
| Departure airport: | Bolzano Airport (BZO/LIPB) |
| Linz-Blue Danube Airport (LNZ/LOWL) | |
| Investigating agency: | ANSV |
| Confidence Rating: |  Accident investigation report completed and information captured |
The accident occurred during a ferry flight from a helipad at Riparbella, Italy, to the Austrian airport of Linz (LOWL), with a technical stop at the airport of Bolzano (LIPB).
The helicopter, after being refueled, took off at 11.05 a.m. from the airport of Bolzano, with a VFR flight plan. The destination is Linz airport (LOWL), following the route BRENO (Brenner Pass), ELLNAU, GRlESENAU, with an estimated BRENO after 25 minutes of flight.
From the information extracted from the pilot's tablet, found in the area of the accident, it appears that the helicopter, after the take-off, followed a route along the Isarco valley in the direction of Bressanone, continuing in the Pusteria valley to Brunico and then in the Tures valley, where it made a spiral gaining altitude to overcome the mountain range and return, presumably, in the direction of the Brenner Pass, point of return to the FIR border. The helicopter was seen flying over the village of Dun with a route from North to South, descending along the valley of Fundres, where eyewitnesses declared to have initially noticed an "irregular" trend and the detachment of pieces and then an explosion.
CAUSES
The cause of the accident can be traced back to the technical factor. The loss of control in flight was due to the detachment and possible interference of the hydraulic damper of the main rotor blade no. 1. This detachment occurred due to the failure of the connecting parts, bolt and lug, due to the corrosion of the lug, probably triggered by the lack of the expected cadmium layer at the thread.
It cannot be excluded that they contributed to the accident:
- the failure of the maintenance personnel to recognize the deterioration of the protective cadmium plating on the hydraulic damper fasteners, which could have already been present before the scheduled maintenance;
- the permanence of the helicopter in the open air near the coast, thus favoring the corrosion of these fasteners.
Accident investigation:
 |
|
Sources:
http://www.ansv.it/It/Detail_relazioni.asp?ID=2044
https://www.newnotizie.it/2017/05/10/alto-adige-precipita-un-elicottero-fundres-morto-pilota/
http://web.archive.org/web/20170511082934/https://www.stol.it/Artikel/Chronik-im-Ueberblick/Lokal/Toedlicher-Hubschrauberabsturz-in-Pfunders-Technischer-Defekt
http://www.ansv.it/cgi-bin/ita/Preliminary%20Report%20N-480W.pdf
___________________________
https://flightaware.com/resources/registration/N480W
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 10-May-2017 16:32 | harro | Added |
| 10-May-2017 16:34 | harro | Updated [Date] |
| 10-May-2017 16:36 | harro | Updated [Time, Departure airport, Destination airport, Source, Damage, Narrative] |
| 11-May-2017 14:16 | Iceman 29 | Updated [Time, Operator, Location, Destination airport, Source, Embed code, Narrative] |
| 17-May-2017 12:24 | TB | Updated [Time, Operator, Phase, Nature, Embed code, Narrative] |
| 20-Jun-2017 15:05 | MKAPPE | Updated [Source] |
| 09-Sep-2020 09:19 | harro | Updated [Nature, Departure airport, Destination airport, Narrative, Accident report, ] |
| 22-Nov-2023 14:56 | harro | Updated [Other fatalities] |
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