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

Verified

Edited By:

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, featuring an auxiliary oil lubrication system.
This new system enhances safety and operational flexibility by enabling the helicopter to safely reach its destination even after primary oil pressure loss, eliminating the need for immediate landing.
The development involved over $100 million and a decade of work, has undergone 800 hours of rigorous testing, and is anticipated to receive FAA certification in 2025.

See a mistake? Contact us.

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.