Sikorsky Unveils New S-92 Phase IV Main Gearbox

System features an auxiliary lubrication that automatically engages in the event of primary oil pressure loss.

Kimberly Johnson

Tuesday, March 11, 2025 at 01:36 PM ET

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Kimberly Johnson

Sikorsky unveiled the S-92 Phase IV main gearbox on Tuesday at Verticon in Dallas. [Courtesy: Lockheed Martin]

Key Takeaways:

Sikorsky has unveiled the S-92 Phase IV main gearbox, featuring an auxiliary oil lubrication system designed to automatically engage if primary oil pressure is lost.
This new system allows the S-92 helicopter to safely reach its destination, eliminating the need for an immediate landing in case of primary oil pressure loss.
The company invested over $100 million and a decade in developing and testing the system, with FAA certification anticipated in 2025.
This enhancement significantly improves the S-92's safety and operational reliability, following other recent upgrades such as extended inspection intervals for gearbox housings.

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Sikorsky has unveiled its long-awaited S-92 Phase IV main gearbox with auxiliary oil lubrication for its twin-engine medium lift helicopter, parent company Lockheed Martin announced Tuesday.

The manufacturer said it invested more than $100 million and more than a decade designing, testing, and optimizing the auxiliary lubrication system that automatically engages in the event of primary oil pressure loss.