Designed for use in nine to fifteen-ton helicopters, the RTM322 engine family spans a power range between 2,100 and 2,600 shp. The RTM 322 currently powers three types: the NH90, a twin-engine military transport/naval frigate helicopter manufactured by NH Industries (a joint venture between Airbus Helicopters, AgustaWestland and Fokker Aerostructures); the EH 101, a three-engine military transport built by AgustaWestland; and the Apache AH Mk.1 attack helicopter, a version of the AH-64D built under license by AgustaWestland.
The RTM322 also powered Airbus Helicopters' X3 technology demonstrator. To date, the RTM 322 powers 60% of the world's fleet of AW101 helicopters and 80% of in-service NH90s. It is used by the air forces of fifteen nations: France, the United Kingdom, Germany, the Netherlands, Denmark, Norway, Sweden, Finland, Portugal, Greece, Belgium, Japan, Oman, New Zealand and Australia. Today, the RTM 322 is the engine of choice for new-generation military helicopters around the world. In total, over 1,100 engines are in service, between them logging in excess of one million flight hours.
The RTM322 was the result of a joint development between Safran Helicopter Engines and British manufacturer Rolls-Royce. An initial variant was qualified in 2003 for the British Ministry of Defence.
In 2013, Safran Helicopter Engines acquired the entire RTM322 program. The engine is now 100% Safran, with the French manufacturer responsible for both production and product support .
In its different versions, the RTM 322 now meets the operational needs of all its military customers: tactical transportation, search and rescue (SAR) at sea and in combat zones, and maritime missions, in particular anti-submarine warfare.
Its architecture includes a high-performance, four-stage compressor (three axial and one centrifugal stage); a two-stage turbine equipped with single-crystal vanes and a highly robust two-stage power turbine. The RTM 322 was designed to maximize performance, particularly in terms of acceleration (maximum power achievable in just three seconds), maintenance (reduced number of parts, easy access to modules) and robustness (enough to withstand extreme marine and desert environments).
The RTM 322 02/8 drives the Leonardo EH 101 helicopter. It serves the British Royal Air Force and Royal Navy, the Portuguese air force (Força Aérea Portuguesa), the Danish royal air force (Flyvevåbnet) and the Japan Maritime Self-Defense Force. The United Kingdom was the first to select the RTM322 in 1999 to power its EH 101 helicopters, followed by Portugal and Denmark in 2001. Certified in July 2003, the RTM322 02/8 is capable of take-off power of 2,270 shp and cruise power of 2,000 shp. Its maximum power in the One Engine Inoperative (OEI) rating is 2,472 shp.