Errant Washer Triggers S-92 Main Gearbox Leak, Emergency Landing | Aviation International News

Errant Washer Triggers S-92 MGB Leak, Emergency Landing

Norwegian authorities blame emergency S-92 landing on maintenance

The washer was probably introduced into the aircraft’s main gearbox during maintenance. — The washer was probably introduced into the aircraft’s main gearbox during maintenance. (Photo: NSIA)

By Mark Huber • Contributor

November 3, 2023

An errant washer is being blamed for the emergency landing of a Bristow Sikorsky S-92A. The Norwegian Safety Investigation Authority (NSIA) has concluded that the washer was probably introduced into the aircraft’s main gearbox (MGB) during maintenance and eventually became lodged standing on edge in the oil passageway, reducing the flow of oil in the return oil channel.

According to the NSIA, the washer likely had been present for nearly 500 flight hours before the event occurred on Sept. 25, 2020, triggering cockpit warnings for MGB loss of oil pressure and rising oil temperature. The crew declared an emergency but continued the flight for another 25 to 30 nm to the airport at Sola, the intended destination. Upon landing, visual evidence revealed a significant oil leak on the left side of the MGB.

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