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 unveiled its S-92 Phase IV main gearbox, which incorporates an auxiliary oil lubrication system.
This new system automatically engages upon primary oil pressure loss, enabling operators to safely reach their destination without needing an immediate landing.
Developed over a decade with an investment exceeding $100 million and validated by more than 800 hours of testing, FAA certification is anticipated in 2025.

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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.