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ASN Wikibase Occurrence # 16604
Last updated: 22 November 2017
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Date:08-SEP-1997
Time:06:56:30
Type:Silhouette image of generic AS32 model; specific model in this crash may look slightly different
Aérospatiale AS 332L1 Super Puma
Owner/operator:Helikopter Service
Registration: LN-OPG
C/n / msn: 2344
Fatalities:Fatalities: 12 / Occupants: 12
Other fatalities:0
Airplane damage: Written off (damaged beyond repair)
Location:100 nm WNW of Brønnøysund -   Norway
Phase: En route
Nature:Non Scheduled Passenger
Departure airport:ENBN
Destination airport:ENNE
Narrative:
At 0600 the helicopter departed from Brønnøysund heading for the floating production, storage and offloading (FPSO) vessel "Norne". On board were 10 passengers and 2 crew. It was a normal flight until an intermittent engine overspeed light was observed.

A fault had developed in the splined adaptor between the high speed bendix shaft and the right hand engine, which had caused damage to the engine overspeed protection system. The splined adaptor disintegrated, severed the high speed shaft, which lead to an overspeed of the power turbine which burst, cutting control rods and the helicopter became uncontrollable. Everybody on-board was killed on impact with the sea.

The critical sensor in the Health and Usage Monitoring System fitted to the aircraft had been unserviceable prior to the accident. The AIBN concluded it would have alerted if it had been serviceable.

The AIBN report makes 18 recommendations, including on regulation on HUMS.

Sources:

Norwegian Civil Aircraft since 1919 / K. Hagby, 1980 (ISBN 0 904597 2 7)
http://www.humsconference.com.au/Papers2003/HUMSp412.pdf
http://aerossurance.com/helicopters/as332l1-ln-opg-accident/
http://www.aibn.no/Aviation/Reports/2001-47-eng


Revision history:

Date/timeContributorUpdates
25-Mar-2008 13:00 ASN archive Added
16-Dec-2009 02:02 84.210.31.120 Updated
12-Feb-2010 00:39 TB Updated [Aircraft type, Source, Narrative]
13-Jun-2010 13:17 TB Updated [Aircraft type, Location, Narrative]
10-Sep-2014 07:33 Aerossurance Updated [Nature, Source, Narrative]
10-Sep-2014 07:34 Aerossurance Updated [Source]
08-Feb-2016 17:26 Aerossurance Updated [Narrative]
07-Sep-2017 19:25 Aerossurance Updated [Source]

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