Boeing MH-139 Grey Wolf
The Boeing MH-139 Grey Wolf is a twin-engine helicopter operated by the United States Air Force for security and support missions. Developed by Boeing, the Grey Wolf is a variant of the Leonardo AW139, an Italian-built multi-role helicopter.
Development
On 24 September 2018, the U.S. Air Force awarded Boeing a $2.4 billion contract to replace the aging UH-1N Twin Huey|UH-1N] helicopter fleet, with the goal of enhancing security patrols of nuclear missile fields and transporting senior officials. This was the first major acquisition for the Air Force Global Strike Command in its 10-year history, following the cancellation of the previous Common Vertical Lift Support Program. As part of this initiative, Boeing was awarded a $285-million contract to build the first 13 MH-139A Grey Wolf helicopters, to guard America's nuclear ballistic missiles.The MH-139A Grey Wolf is to be used for security patrols, search and rescue missions, and personnel and cargo transport. The Air Force's first intention was to purchase 84 helicopters for security and transportation across extensive intercontinental ballistic missile fields, and senior leader and executive airlift in the Washington, D.C., Special [Flight Rules Area|Air Defense Identification Zone], also known as the National [Capital Region (United States)|National Capital Region]. It is also to be used in aircrew survival training.
The precise quantity of the MH-139 fleet remains unknown. Initially, the requirement was for up to 84 helicopters, which was then reduced to 80, then 74. The most recent Fiscal Year 2025 budget suggests a further reduction, to a fleet of 36 MH-139s. The Grey Wolf program has faced numerous setbacks and delays, including difficulty with attaining Federal Aviation Administration type certification. Typically, FAA certification is not required for Lists of military aircraft of [the United States|US military aircraft], but it is for the MH-139 because the helicopters are to be required to operate extensively within US domestic airspace.
Design
The MH-139A Grey Wolf features military and commercial system integration capabilities that play a crucial role in the Grey Wolf program. It features an integrated training system based on existing AW139 operational flight trainers. Its sustainment tools ensure seamless USG interfaces. A global Commercial/DoD support system ensures efficient parts procurement. The unique design enables maintainers to conduct all aircraft maintenance at the operational level.The helicopter is propelled by two FADEC-controlled Pratt & Whitney Canada PT6 turboshaft engines, housed in separate engine turbine burst containment boxes, each with independent inputs to the main gearbox. The engines' infrared signature has been decreased by lowering airflow and using a directed exhaust, reducing plume impingement upon the tail fuselage.