ASN Wikibase Occurrence # 66677
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| Date: | Sunday 9 December 2007 |
| Time: | 10:53 |
| Type: |  Eurocopter EC 135T2 |
| Owner/operator: | All Nippon Helicopter (ANH) |
| Registration: | JA31NH |
| MSN: | 0254 |
| Year of manufacture: | 2002 |
| Fatalities: | Fatalities: 1 / Occupants: 2 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Minami-Numagami, Aoi-Ku, Shizuoka -
 Japan
|
| Phase: | Approach |
| Nature: | Ferry/positioning |
| Departure airport: | Tokyo Heliport |
| Shizuoka Heliport | |
| Investigating agency: | JTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
Crashed following control problems due to failure of TR pitch change rod.
There were two persons on board the aircraft, consisting of the captain and one mechanic on board, and the captain died and the mechanic on board was seriously injured. It is considered highly probable that the captain died in this accident because he was not fastening his shoulder harness.
Prior troubleshooting for the tail rotor control system was not performed in accordance with the trouble shooting procedure provided in the English written maintenance manual of the aircraft manufacturer. As a result, the inspection of the ball pivot was not performed and its stiffening was not found. In addition, the fact that the joint of the tail rotor control rod and the yaw actuator has a left-handed thread is provided in the English written maintenance manual of the aircraft manufacturer, but it is considered somewhat likely that the mechanic involved in this case, while intending to tighten the joint, actually turned the joint to the opposite direction to loosen it.
The Manufacturer issued an Alert Service Bulletin, ASB EC135-67A-017 Revision 03 on July 26, 2010 to instruct replacement of the old rod to the new type of rod.
Accident investigation:
 |
|
Sources:
http://www.mlit.go.jp/jtsb/eng-air_report/JA31NH.pdf
https://www.japantimes.co.jp/news/2007/12/10/national/pilot-dies-mechanic-injured-in-shizuoka-helicopter-crash/
http://aerossurance.com/helicopters/misdiagnosis-trcf-ec135-japan/
Media:
Maintenance Misdiagnosis Precursor to EC135 Tail Rotor Control Failure
— Aerossurance (@Aerossurance) March 23, 2019
https://t.co/ajZHERzMLY#flightsafety #airworthiness #avgeek #avgeeks #helicopter #maintenance #humanfactors pic.twitter.com/qdhW0QyNTv
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 28-Jul-2009 12:05 | harro | Added |
| 18-Aug-2010 15:28 | TB | Updated [Aircraft type, Operator, Other fatalities] |
| 04-Mar-2013 13:21 | TB | Updated [Aircraft type] |
| 22-Aug-2014 13:57 | Aerossurance | Updated [Time, Location, Departure airport, Destination airport, Source, Narrative] |
| 13-Sep-2014 16:18 | Aerossurance | Updated [Source] |
| 13-Sep-2014 16:23 | Aerossurance | Updated [Source] |
| 07-May-2016 08:27 | Aerossurance | Updated [Aircraft type] |
| 10-Dec-2018 11:22 | Aerossurance | Updated [Narrative] |
| 27-Dec-2018 17:25 | Aerossurance | Updated [Source] |
| 28-Dec-2018 10:24 | Aerossurance | Updated [Phase] |
| 23-Mar-2019 11:34 | Aerossurance | Updated [Source, Embed code] |
| 17-Nov-2022 07:35 | harro | Updated [Source, Embed code, Accident report] |
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