MBBKawasaki BK 117

The BK 117 is a twin-engine helicopter developed by MBB (Germany) and Kawasaki (Japan), first flown in 1981 and entering service in 1982. Known for reliability and versatility, production continued under Eurocopter until 2004 when replaced by the EC145. Design features include a fenestron tail rotor for reduced noise and safety, composite rotors for durability, and modular construction for easy maintenance.

Primarily used in emergency medical services (EMS), search and rescue, law enforcement, and civilian transport, its popularity stems from its reliability and capacity to carry up to 10 passengers. Over 1,000 units were produced, highlighting its success across various roles.

The BK 117 B-2 model has a crew of one, measures 9.91 meters in length, 3.85 meters in height with rotors, and weighs between 1,727 kg (empty) and 3,350 kg (max takeoff). It uses two Lycoming LTS 101-750B-1 turboshafts, each producing 442 kW, with an 11-meter main rotor diameter.

Performance includes a max speed of 250 km/h, never exceed speed of 278 km/h, range of 541 km, and service ceiling up to 4,575 meters. It climbs at 11 m/s and hovers effectively in ground effect up to 3,565 meters.

Operators include military forces like Germany, South Africa, and the US, as well as civil entities such as Rega (Switzerland) and CareFlight (Australia). Its retirement from production in 2004 marked a transition to its successor, the EC145. The BK 117's impact is evident through its widespread adoption and versatility across multiple operational roles.