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Boeing MH-139 - United States, 2020

Detailing the development and operational history of the Boeing MH-139 Multi-Mission Medium-Lift Military Helicopter.

 Entry last updated on 9/19/2017; Authored by Staff Writer; Content ¬©

  Boeing MH-139  
Picture of Boeing MH-139
Picture of Boeing MH-139 Picture of Boeing MH-139

The Boeing MH-139, built upon the framework of the Italian Leonardo AW139 helicopter, is being offered as a contender for the USAF UH-1N Huey replacement program.

The MH-139 is a Boeing-modified version of the successful Italian-originated AW139 series of medium-lift helicopters produced by Leonardo. It is intended to compete in the newly-announced United States Air Force's UH-1N "Twin Huey" Replacement Program. The UH-1N (Model 212 is its civilian market equivalent) is a twin-engined model of the original Vietnam-era single-engined Huey transport / gunship. However, its design is rooted in Cold War-era doctrine which has required the series to receive regular modernizations to keep the series viable for the short-term - a long-term solution by the USAF is now sought.

The Twin Huey was debuted in 1970 and is in service with a plethora of global operators beyond the United States. The USAF uses these mounts for local security at high-level installations and as VIP transports. At any rate, replacing this proven warrior is a tall order for any interested company.

The AW139 framework promotes a robust, reliable and proven rotary-wing platform that has seen production top nearly 800 examples since series introduction occurred in 2003. Like the Twin Huey, the AW139 has been adopted by a large collection of operators around the world including several American police agencies. The Boeing offering is helped some by the fact that the Italian helicopter is already produced locally in the United States out of Philadelphia.

Outwardly, the MH-139 is a sleek offering the inherent benefits of the existing AW139 with the benefits of Boeing-installed mission equipment. The platform makes use of a two-man crew seated (side-by-side) in an all-modern, all-glass cockpit. Digital color displays dominate the two positions with a shared console in-between. Vision out-of-the-cockpit is excellent thanks to the proven AW139's design spanning over 1.7 million flight hours in various environments worldwide.

The passenger cabin is relatively spacious and features large rectangular rear-sliding doors for easy entry/exit of passengers and the high position of both the main rotor and tail rotor add safety for embarking/disembarking passengers.. There is a position between the pilot seats and passenger area to fit optional pintle-mounted armament for fire suppression by way of machine guns. These are purposely placed so as not to obstruct passenger entry/exit. The cabin can be configured for cargo or passengers as needed - seating fifteen in the latter. Over the starboard side of the fuselage (at the passenger sliding door) can also be installed a rescue hoist for Search and Rescue (SAR) sorties or a cargo winch for cargo-hauling missions. The undercarriage is wheeled at all three legs and fully retractable. The nose mounts sensor turret blister housing a FLIR Star Safire 350HDc high-definition, full-color electro-optical/IR ball.

The MH-139 makes use of a five-bladed main rotor system designed for high-performance and low-noise. It sits low along the fuselage and is mounted atop the twin-engine compartment. The engines are held in a separate engine compartment with individual access to the transmission system. The turbofans are aspirated through side-facing intakes to reduce the change of object ingestion. Furthermore, the systems are developed with inherent InfraRed (IR) reduction of which directional exhaust flow is a part of. Access to the engine units is through large, hinged panels along their sides. The tail rotor is of a four-bladed arrangement set to starboard. It is purposely fitted high atop the tail fin so as to clear ground personnel.

The MH-139 was debuted at the 2017 Andrews Air Show. It is in direct competition with Lockheed's Sikorsky UH-60U offering for the Twin Huey Replacement Program.

Boeing MH-139 Specifications

Service Year: 2020
Type: Multi-Mission Medium-Lift Military Helicopter
National Origin: United States
Manufacturer(s): Leonardo Italy - Italy / Boeing Company - USA
Total Production: 1

Structural (Crew, Dimensions, Weights)

Operating Crew (Typical): 2
Overall Length: 54.63 feet (16.65 meters)
Overall Width: 45.28 feet (13.80 meters)
Overall Height: 16.40 feet (5.00 meters)

Weight (Empty): 8,157 lb (3,700 kg)
Weight (MTOW): 14,330 lb (6,500 kg)

Power / Performance (Engine Type, Top Speed)

Engine: ESTIMATED: 2 x Pratt & Whitney Canada PT6C-67C turboshaft engines developing 1,750 horsepower each and driving a five-bladed main rotor and four-bladed tail rotor.

Maximum Speed: 175 knots (202 mph; 325 kph)
Maximum Range: 702 nautical miles (808 miles; 1,300 km)
Service Ceiling: 20,341 feet (6,200 meters; 3.85 miles)
Rate-of-Climb: 2,300 feet-per-minute (701 m/min)

Armament / Mission Payload

Optional pintle-mounted machine guns along the fuselage sides as needed.

Global Operators (Customers, Users)

Untied States (possible)

Model Variants

MH-139 - Base Series Designation; AW139 helicopter modified by Boeing.

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