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ASN Wikibase Occurrence # 168914
Last updated: 20 June 2020
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Time:17:00 LT
Type:Silhouette image of generic S92 model; specific model in this crash may look slightly different
Sikorsky S-92A
Owner/operator:Bristow Norway AS
Registration: LN-ONW
C/n / msn: 920090
Fatalities:Fatalities: 0 / Occupants: 14
Other fatalities:0
Aircraft damage: Minor
Location:Yme Offshore Installation, North Sea, 120nm SW of Stavanger -   Norway
Phase: En route
Nature:Non Scheduled Passenger
Departure airport:Stavanger
Destination airport:Valhalla offshore installation
Enroute to the to Valhalla offshore installation when several warning lights in the cockpit came on. At the same time the main gearbox reduced cooling of the oil.

Indicated MGB pressure dropped to 49 psi with temperature working it's way up to 150 degrees, followed by Input #1 hot. Situation classified as "Land as Soon as Possible". The relatively high pressure would indicate a both pumps were working. It appears an electrical fault resulted in the oil cooler bypass activating (hence the temperature rise).

On 28 August 2013, another S-92A, operated in the Gulf of Mexico experienced a similar event. In that event the crew also landed safely on a platform with no damage to the aircraft nor injuries to the passengers or crew.

The crew decided to make a precautionary landing on the unmanned/closed Yme platform (17nm away). The passengers and crew were retrieved from the platform by RNoAF SAR Sea King.

Visibility reported to be poor, Sea State 5, winds 40-45 knots.

AIBN have chosen to investigate this incident.

Safety recommendation SL No. 2015/11T

On 4 October 2013, LN-ONW made an emergency landing on the evacuated Yme oil rig. A minor technical fault in the main gearbox resulted in indications which the crew perceived to be serious.The Accident Investigation Board is of the opinion that the emergency checklist for the main gearbox on the S-92A was complicated and difficult to understand, particularly in a stressful emergency situation. This view is supported by the operating company Bristow Norway AS. After this incident, Sikorsky has revised the relevant parts of the emergency checklist, and started a redesign process to improve the warning/caution system on the main gearbox. The Accident Investigation Board Norway is however of the opinion that further improvements is needed, and therefore recommends that Sikorsky revise the emergency checklist with the aim of further simplification and increased user-friendliness.



Photo of LN-ONW courtesy

Stavanger - Sola (ENZV / SVG)
30 August 2016; (c) Kjell

Revision history:

20-Aug-2014 06:54 Aerossurance Added
20-Aug-2014 07:04 Aerossurance Updated [Narrative]
30-Nov-2015 09:50 Aerossurance Updated [Source, Narrative]
30-Nov-2015 10:08 Aerossurance Updated [Source]
26-Sep-2016 13:34 Aerossurance Updated [Location, Narrative]
27-Sep-2016 13:36 Aerossurance Updated [Time, Source]

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