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ASN Wikibase Occurrence # 223492
Last updated: 25 October 2020
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Date:23-MAR-2019
Time:18:05
Type:Silhouette image of generic R44 model; specific model in this crash may look slightly different
Robinson R44 Raven I
Owner/operator:Private
Registration: LN-OGF
C/n / msn: 1449
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:Stavnes, Krager° municipality, Telemark county -   Norway
Phase: En route
Nature:Private
Departure airport:Lang°y
Destination airport:Skien
Investigating agency: AIBN
Narrative:
Two people were flying a private Robinson R44 helicopter from Lang°y to Skien. Over Stavnes the commander noticed a power loss. An attemt to autorotate failed and the helicopter hit treetops in a dense firtree forest and fell to the ground. Both of the two on board were injured and the helicopter was destroyed.
The examination of the helicopter wreckage showed that a spark plug on cylinder no. 5 was loose.
This caused an air leakage, increased temperature in the cylinder and damage to an intake valve. Most likely, the spark plug loosened because isufficient torque was applied during installation in connection with a 100-hour inspection conducted in November 2018.

Sources:

https://www.nrk.no/telemark/ragnhild-_72_-sa-helikopterstyrten_-_--det-sa-ut-som-det-traff-tretoppene-1.14488712
https://www.dagbladet.no/nyheter/tredje-ulykke-siden-nyttar/70908004
https://www.nettavisen.no/nyheter/politiet-varslet-om-helikopterstyrt-i-bamble-i-telemark/3423630377.html
https://www.dagbladet.no/nyheter/overlevde-helikopterstyrt/70910846
http://aerossurance.com/helicopters/latent-defect-r44-nr-droop
https://www.aibn.no/Aviation/Undersokelser/19-263

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

Media:


Revision history:

Date/timeContributorUpdates
25-Mar-2019 07:06 Whiteshark Added
25-Mar-2019 08:52 RobertMB Updated [Time, Aircraft type, Registration, Cn, Operator, Other fatalities, Source]
25-Mar-2019 08:58 Whiteshark Updated [Time, Registration, Location, Source, Narrative]
25-Mar-2019 09:09 RobertMB Updated [Time, Aircraft type, Registration, Cn, Operator, Other fatalities, Source]
26-Mar-2019 07:50 Whiteshark Updated [Departure airport, Destination airport, Source, Narrative]
26-Mar-2019 18:54 Whiteshark Updated [Narrative]
02-Apr-2019 18:52 Aerossurance Updated [Operator, Location, Phase, Departure airport, Destination airport, Source, Narrative]
19-Sep-2020 12:25 harro Updated [Time, Narrative, Accident report, Accident report, ]
09-Oct-2020 16:04 Aerossurance Updated [Source, Category, Accident report]
10-Oct-2020 08:36 Aerossurance Updated [Embed code]

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