Coment:  Super impressed by safety feature described below having been in flight formation when our sister ship encountered an inflight emergeney when a tail rotor was damaged resulting in a safe autorotation landing of a UH1-F caused by maintenance cover vibrating loose and coming off admittedly not small pieces coming off.  Also should rotor transmission lubrication fail, Grey Wolf dry run times are truly impressive.

https://helicopters.leonardo.com/en/products/aw139m 

PROMOTIONAL MATERIAL:  LEONARDO

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Simply no rivals

The multi-role AW139M, the military version of the AW139, meets the demand of military and government missions to perform day and night, in the most challenging environments. It combines advanced technology and high power margins with inherent safety and survivability, alongside the flexibility to add dedicated role equipment, including optional internal and external weapon systems.

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Powerplant

Pratt & Whitney’s PW210A and PT6C-67C engines, powering AW169 and AW139 respectively, are designed to include an inherent helicopter protection safety barrier in the unlikely event of rotor fragment release, by containing intermediate fragments from the mixed flow rotor and turbine stages, as well as small fragments from all compressor and turbine stages. This is a robust and reliable complementary safety feature to the whole helicopter risk minimisation system provided by Pratt & Whitney.

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Transmission Run Dry Capability

Thanks to specific gearbox design, Leonardo’s helicopters can provide safe flight far beyond the minimum civil certification requirement of 30 minutes following a lubrication failure. Designed to withstand loads beyond operating limits and capable of maintaining an optimised oil distribution even during system failure, main rotor transmission is to run dry as follows: over 40 minutes safe run dry for AW169, 60 minutes for AW139 and 50 minutes for AW189.

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"First Huey replacement helicopter delivered to US Air Force"

https://www.airforcetimes.com/air/2024/08/06/first-huey-replacement-helicopter-delivered-to-us-air-force/

An MH-139A Grey Wolf lands at Eglin Air Force Base, Florida, April 5, 2024. (Samuel King Jr./Air Force)

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"US Air Force receives first ‘production' MH-139A Grey Wolf helicopter"

2024-08-06

https://www.janes.com/osint-insights/defence-news/industry/us-air-force-receives-first-production-mh-139a-grey-wolf-helicopter

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"First MH-139A Production Helicopter Delivered to USAF"

https://www.helis.com/database/news/boeing-mh-139-first-production-ac