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Norwegian authorities are investigating what they describe as a “serious aviation incident,” after a Sikorsky S-92A suffered an oil leak that forced the crew to declare mayday before landing safely.
The incident took place on Sept. 25, 2020, as the Bristow Norway-operated aircraft returned to Sola from the West Elara oil installation. About 25 to 30 nautical miles southwest of Sola, as the aircraft was making a descent from 7,000 feet to 1,000 feet, its crew received a caution that the oil pressure on the main gearbox had dropped below 45 psi.
Shortly afterwards, the caution “INPUT/AA #1 HOT” came on, and the crew followed the emergency checklist to put the left engine back to idle.
The oil pressure continued to drop to below 35 psi, and the oil cooler automatically switched off. As the aircraft continued its approach to Sola, the oil temperature rose and the caution “INPUT/ACC #2 HOT” came on. The oil reached a peak temperature of 214 C.
The crew declared mayday as they continued to descend to 200 feet, and were preparing to ditch in the sea if the oil pressure disappeared completely.
However, the aircraft was able to land normally at Sola, and it was followed to a standstill by the airport’s fire and rescue department.