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 its S-92 Phase IV main gearbox, which features an innovative auxiliary oil lubrication system.
This system, developed with over $100 million in investment, automatically engages if primary oil pressure is lost, eliminating the need for immediate landing and allowing safe continuation of flight.
Validated through over 800 hours of testing, the system is anticipated to receive FAA certification in 2025, significantly enhancing the safety and reliability of S-92 helicopters for critical missions.

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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.