ASN Wikibase Occurrence # 201075
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| Date: | Wednesday 8 November 2017 |
| Time: | 14:29 LT |
| Type: |  Aerospatiale AS 332L Super Puma |
| Owner/operator: | Toho Air Service |
| Registration: | JA9672 |
| MSN: | 2173 |
| Fatalities: | Fatalities: 4 / Occupants: 4 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Ueno, Gunma Prefecture -
 Japan
|
| Phase: | En route |
| Nature: | Ferry/positioning |
| Departure airport: | Hayakawa town, Yamanashi prefecture |
| Tochigi Heliport, Haga town, Tochigi prefecture | |
| Investigating agency: | JTSB |
| Confidence Rating: |  Information verified through data from accident investigation authorities |
The helicopter crashed on a road bridge. According to local media all four occupants, flight crew and rear crew, died in the crash. The helicopter was consumed by post impact fire.
Local press reports mention the aircraft flying low down a valley and a local power outage suggesting a possible wire strike. Eyewitness reports that the helicopter was initially bound northeast, but returned back in a low altitude, which is suspected an attempt of precaution landing. Thereafter, some parts of the tail section were separated, and the Super Puma enter a steep dive.
On 21st November 2017, JTSB released an interim report. It reveals that a pin to attach the rail rotor was fractured and found several ten meters away from the main fuselage, at the other side of the river. EASA issued an Airworthiness Directive which requires to inspect these pins of AS 332L and AS 332L1 helicopters.
The failure followed incorrect maintenance and the degradation of the white TR blade flapping hinge bearing
Accident investigation:
 |
|
Sources:
https://japantoday.com/category/national/4-feared-dead-after-helicopter-crash-in-Gunma
http://www.xinhuanet.com/english/2017-11/08/c_136737044.htm
http://web.archive.org/web/20171111033105/http://www3.nhk.or.jp:80/news/html/20171108/k10011215761000.html?
https://flyteam.jp/news/article/86558
http://tohoair.co.jp/english/index.html
https://www.japantimes.co.jp/news/2017/11/08/national/four-dead-helicopter-crashes-mountains-gunma
http://web.archive.org/web/20180102164040/https://mainichi.jp/english/articles/20171108/p2g/00m/0dm/071000c
http://www.mlit.go.jp/jtsb/iken-teikyo/JA967220171108.pdf
http://aerossurance.com/helicopters/as332l-tail-rotor-bearing/
https://jtsb.mlit.go.jp/jtsb/aircraft/detail.php?id=2204
Location
Media:
We translate from Japanese the JTSB report on an AS332L #accident. After a series of #maintenance errors a deteriorating tail rotor blade flapping hinge failed in flight.https://t.co/S2lUoKgk22#helicopter #airworthiness #humanfactors #flightsafety #aviationsafety pic.twitter.com/F6a4LDIip8
— Aerossurance (@Aerossurance) May 9, 2020
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 08-Nov-2017 07:34 | gerard57 | Added |
| 08-Nov-2017 07:43 | gerard57 | Updated [Time, Total fatalities, Source, Narrative] |
| 08-Nov-2017 08:01 | L1011tristar | Updated [Aircraft type, Registration, Cn, Location, Nature, Source] |
| 08-Nov-2017 08:48 | TB | Updated [Time, Aircraft type] |
| 08-Nov-2017 13:27 | isamuel | Updated [Time, Departure airport, Destination airport, Source, Narrative] |
| 08-Nov-2017 13:58 | Aerossurance | Updated [Source, Narrative] |
| 08-Nov-2017 14:00 | Aerossurance | Updated [Narrative] |
| 08-Nov-2017 14:33 | Aerossurance | Updated [Source, Narrative] |
| 08-Nov-2017 14:34 | Aerossurance | Updated [Embed code] |
| 09-Nov-2017 09:28 | Aerossurance | Updated [Source] |
| 10-Nov-2017 09:21 | Aerossurance | Updated [Location] |
| 23-Nov-2017 07:21 | isamuel | Updated [Source, Narrative] |
| 06-May-2020 15:08 | Aerossurance | Updated [Source, Embed code] |
| 09-May-2020 09:56 | Aerossurance | Updated [Source, Narrative] |
| 09-May-2020 10:12 | Aerossurance | Updated [Embed code] |
| 30-Sep-2022 19:18 | harro | Updated [Date, Time, Embed code, Accident report] |
Corrections or additions? ... Edit this accident description
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