Accident Eurocopter EC 135T2 JA31NH,
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ASN Wikibase Occurrence # 66677
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Date:Sunday 9 December 2007
Type:Silhouette image of generic EC35 model; specific model in this crash may look slightly different    
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
Location:Minami-Numagami, Aoi-Ku, Shizuoka -   Japan
Phase: Approach
Departure airport:Tokyo Heliport
Destination airport: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:
Investigating agency: JTSB
Report number: 
Status: Investigation completed
Duration: 3 years and 4 months
Download report: Final report



Revision history:

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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