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    NEWS | Sikorsky S-92 in Bristow Norway AS

    Emergency Landing of Bristow Norway S-92

    Norwegian Safety Investigation Authority (NSIA) started an investigation of an incident involving oil pressure drop by a Sikorsky S-92A operated by Bristow Norway some 25nm SW of Stavanger Airport Sola. The helicopter landed safely but so far no explanation has been determined


    Emergency Landing of Bristow Norway S-92

    AIBN, September 30, 2020 - On Friday 25 September 2020, the Sikorsky Aircraft Corporation S-92A, LN-ONQ, operated by Bristow Norway was on its way back to Sola (ENZV) after a flight to the West Elara oil installation.

    During descent from 7 000 ft. towards 1 000 ft., at a height of approx. 4 500 ft. the crew received a caution that the oil pressure on the main gearbox had dropped below 45 psi.

    Shortly afterwards, the caution "INPUT / ACC # 1 HOT" came on.

    According to the emergency checklist, the crew pulled the left engine back to idle. When the oil pressure dropped further to below 35 psi, the oil cooler was automatically switched off. During the further flight towards Sola, the oil temperature rose and the caution "INPUT / ACC # 2 HOT" came on. The highest recorded oil temperature before landing was 214 degrees C.

    The crew declared mayday, and continued the descent to a height of 200 ft. They were preparing to land on the sea if the oil pressure were to disappear completely.

    The landing at Sola was undramatic and the helicopter was followed to standstill by the airport fire and rescue department.

    The NSIA arrived at Sola the same evening, and started preliminary investigations.

    The following findings were revealed:

    - There was some oil spill on the left engine and the left side of the main gearbox.

    - Oil was observed on the outside of the helicopter, especially on the left side of the fuselage.

    - The oil appeared to come from the left engine input to the main gearbox area.

    - There were no signs of leakage in the oil cooler or its hose connections.

    - Approximately 4 liter of a total amount of approximately 30 liters of oil was lacking from main gearbox.

    - The indicator that warns of a high pressure difference across the oil filter had come out. Initial visual inspection of the oil filter showed no particles. The filter will be further examined.

    - No metal particles were found on the main gearbox's magnetic plugs.

    - So far no explanation for the incident is determined.

    The main gearbox has been removed from the helicopter, and will be sent to the manufacturer Sikorsky for further investigations. The investigations will take place under the auspices of the Norwegian Safety Investigation Authority with assistance from the American Accident Investigation Board NTSB.

    Aircraft mentioned in this article :
    Sikorsky S-92A LN-ONQ     ( Bristow Norway AS )

    This article is listed in :
    Sikorsky S-92 in Bristow Norway AS
    Oil and Gas Industry in Norway
    --Helicopters Accident Reports
    Stavanger - Sola Airport




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