AgustaWestland AW139

AgustaWestland AW139

AgustaWestland AW139: The Modern Standard in Medium Twin-Engine Helicopters

The AgustaWestland AW139 is a cutting-edge medium-lift, twin-engine helicopter that has rapidly become the aircraft of choice for a wide variety of missions across both civilian and military sectors. Lauded for its performance, versatility, and safety features, the AW139 has earned a global reputation as one of the most capable and adaptable helicopters in its class.

Developed originally by Agusta (Italy) and Bell Helicopter (USA) as part of a joint venture, the aircraft was fully acquired by AgustaWestland (now part of Leonardo Helicopters) and entered production in 2003. Since then, it has been widely adopted by law enforcement agencies, emergency medical services (EMS), offshore oil and gas operators, and armed forces around the world.

This article explores the AW139’s development, design features, technical specifications, and operational use, illustrating why it has become a dominant player in the modern rotorcraft market.

Design and Development

The AW139 was conceptualized as a multi-role helicopter with enhanced speed, range, and mission flexibility. From the outset, it was engineered to meet the latest international safety standards, offering features such as full ice protection, crashworthy systems, and redundant avionics.

Key goals during development included:

• Greater payload and cabin volume than competitors in its class
• Faster cruising speeds with better fuel efficiency
• A fully digital glass cockpit to reduce pilot workload
• Rapid reconfiguration for diverse mission roles

The first prototype flew on February 3, 2001, and after a successful flight test campaign, the AW139 entered service in 2003. Continuous upgrades have since been introduced, including performance packages and the AW139M military variant.

Airframe and Structural Design

The AW139 features a sleek, streamlined airframe built primarily from lightweight composite materials and aluminum alloys, optimizing structural integrity while reducing weight. Its fully retractable landing gear, along with high-set tail rotor and clean fuselage lines, contribute to reduced drag and superior aerodynamic performance.

Airframe Highlights

• Construction: Aluminum and composite structure for strength and weight reduction
• Main Rotor: Five-blade fully articulated composite rotor
• Tail Rotor: Four-blade canted tail rotor for improved anti-torque efficiency and low noise
• Landing Gear: Fully retractable tricycle landing gear with dual wheels on main gear for rough field operations
• Crashworthy Design: Includes energy-absorbing landing gear, crashworthy seats, and self-sealing fuel tanks

Dimensions

• Overall Length (rotors turning): 16.66 m (54 ft 8 in)
• Fuselage Length: 13.8 m (45 ft 3 in)
• Main Rotor Diameter: 13.8 m (45 ft 3 in)
• Height: 4.98 m (16 ft 4 in)
• Rotor Disc Area: 149.6 m² (1,610 ft²)
• Cabin Volume: 8 m³ (282 ft³)
• Baggage Compartment Volume: 3.4 m³ (120 ft³)

Avionics and Cockpit

The AW139 is equipped with a state-of-the-art glass cockpit, making it suitable for single-pilot IFR operations and reducing pilot workload significantly. The avionics suite is fully digital and designed for night vision goggle (NVG) compatibility, supporting complex missions in all conditions.

Avionics Suite

• Integrated Flight Management System (FMS)
• Four-axis Dual Digital Automatic Flight Control System (AFCS)
• Dual Multifunction Displays (MFDs) and Primary Flight Displays (PFDs)
• Weather radar
• Digital Map System
• TCAS II (Traffic Collision Avoidance System)
• TAWS (Terrain Awareness and Warning System)
• Synthetic Vision System (SVS) and Enhanced Vision System (EVS) optional
• Satellite communication and ADS-B out compatibility

Powerplant and Performance

One of the most defining characteristics of the AW139 is its power-to-weight ratio, enabling excellent hover performance, climb rate, and hot-and-high capabilities. It is powered by two reliable turboshaft engines mounted above the cabin, driving the rotor system through a highly efficient main gearbox.

Engine Configuration

• Engines: 2 × Pratt & Whitney Canada PT6C-67C turboshafts
• Power Output: 1,679 shp (1,252 kW) each
• Transmission Rating: 3,226 shp (2,405 kW)
• Engine Control: Full Authority Digital Engine Control (FADEC)

Performance Metrics

• Maximum Cruise Speed: 306 km/h (165 knots, 190 mph)
• Maximum Speed (Vne): 310 km/h (167 knots)
• Range: 1,061 km (572 nautical miles) with auxiliary fuel
• Endurance: 5 hours+ depending on configuration
• Service Ceiling: 6,096 m (20,000 ft)
• Hover Ceiling (OGE): 2,438 m (8,000 ft)
• Rate of Climb: 10.8 m/s (2,130 ft/min)
• Maximum Takeoff Weight (MTOW): 6,800 kg (14,991 lb)
• Internal Payload: Up to 2,500 kg (5,511 lb)
• External Sling Load: Up to 2,260 kg (4,982 lb)

Cabin and Interior Configuration

The AW139 boasts the largest cabin in its class, allowing for spacious seating, flexible interior configurations, and easier in-cabin movement for crew and passengers. The flat floor and large sliding doors on both sides offer quick access for stretchers, cargo, or passengers.

Cabin Layouts

• Passenger Configuration: Up to 15 passengers in airline-style seats
• Executive/VIP: 6–8 seats with luxury interior, soundproofing, and cabin climate zones
• EMS Configuration: Room for up to 4 stretchers, medical attendants, and full life support equipment
• Search and Rescue (SAR): Integrated hoists, mission consoles, operator stations, and flotation gear

Mission Roles and Applications

The AW139’s versatility allows it to fulfill a wide variety of missions:

• Offshore Oil & Gas Transport: Primary role for operators flying to and from oil rigs
• Search and Rescue (SAR): Equipped with hoists, weather radar, FLIR, and emergency medical kits
• Emergency Medical Services (EMS): Rapid medical evacuation with full hospital-grade facilities onboard
• VIP/Corporate Transport: Configurable luxury interiors for private and governmental use
• Law Enforcement and Border Patrol: Surveillance, personnel deployment, and pursuit support
• Military Utility Transport: Tactical troop movement, medevac, command and control
• Disaster Relief and Humanitarian Aid: Cargo and personnel transport in disaster zones

Technical Specifications – AgustaWestland AW139

Global Operators and Fleet Size

As of recent data, more than 1,100 AW139 helicopters have been delivered to operators in over 80 countries, accumulating millions of flight hours. Major operators include:

• CHC Helicopter (offshore support)
• Qatar Emiri Air Force
• Japan Coast Guard
• Italian Guardia di Finanza
• U.S. Customs and Border Protection
• Irish Air Corps
• United Arab Emirates Air Force

The AW139 is also a backbone platform for national emergency services in countries like Australia, the UK, and Canada.

Conclusion

The AgustaWestland AW139 represents the pinnacle of modern helicopter engineering in the medium-twin category. With its combination of speed, safety, payload, and mission adaptability, it has carved out a vital niche across commercial and governmental aviation sectors. From transporting offshore workers to saving lives in search and rescue missions, the AW139 does it all—and does it with remarkable reliability and efficiency.

Its success has not only led to further variants like the AW149 and AW169, but also continues to shape the future of rotorcraft design through ongoing upgrades and mission-specific adaptations. The AW139 isn’t just a helicopter—it’s a platform that defines the standard for modern multi-role rotorcraft worldwide.