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ASN Wikibase Occurrence # 168906
Last updated: 19 September 2020
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Date:12-AUG-2014
Time:18:00 LT
Type:Silhouette image of generic EC30 model; specific model in this crash may look slightly different
Eurocopter EC 130B4
Owner/operator:Helikopter Utleie AS
Registration: LN-ORR
C/n / msn: 4684
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Minor
Category:Serious incident
Location:Rorvik Airport (ENRM) -   Norway
Phase: Landing
Nature:Ferry/positioning
Departure airport:Bardufoss
Destination airport:Rorvik Airport (ENRM)
Investigating agency: AIBN
Narrative:
On short finals, at low speed, the helicopter suddenly lost power from its fenestron. Uncontrolled rotation to the left started as the helicopter passed runway treshold at an altitude of 5-10 metres. The commander quickly understood that he had no directional control, and chose to land the helicopter without engine power. The helicopter rotated twice around its own axis before it was landed on the runway. No injuries or damage occurred.
After landing, it was quickly discovered that there was no mechanical connection between the fenestron (tail rotor) and the engine's reduction gearbox.

A technical investigation revealed that the tail rotor shaft had fractured due to incorrect installation of the tail rotor shaft bearing no. 1. The incorrect installation led to cyclic loads in the tail rotor shaft, which eventually caused a fracture. The bearings on the tail rotor shaft were replaced in connection with scheduled maintenance 98 flying hours prior to the incident.

Since an incorrect installation of bearing no. 1 caused the fracture, further investigations were conducted both in the helicopter company's Part M organisation and in the maintenance organisation that delivers maintenance services to the helicopter company. The investigations identified a number of deficiencies in connection with planning of maintenance, routines for systematic control of critical maintenance activities, as well as routines for maintaining technical personnel's competence.

Sources:

https://www.aibn.no/Luftfart/Undersokelser/14-477
http://www.bea.aero/fr/enquetes/2014/2014.semaine.33.pdf
http://www.fjordhelikopter.no/Default.aspx?alias=www.fjordhelikopter.no/FHenglish
https://www.aibn.no/Luftfart/Avgitte-rapporter/2016-01-eng
http://aerossurance.com/helicopters/trds-brg-installation-error/

Accident investigation:
cover
  
Investigating agency: AIBN
Status: Investigation completed
Duration:
Download report: Final report
Location


Revision history:

Date/timeContributorUpdates
19-Aug-2014 19:37 Aerossurance Added
02-Sep-2014 16:02 Alpine Flight Updated [Time, Aircraft type, Location, Nature]
01-Feb-2016 14:49 Aerossurance Updated [Departure airport, Source, Narrative]
16-Feb-2016 09:04 Aerossurance Updated [Source]
11-Sep-2020 18:44 harro Updated [Location, Nature, Destination airport, Narrative, Accident report, Accident report, ]

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