W-3A Sokol Twin-Engine Multi-Purpose Utility Helicopter, Poland
W-3A Sokol is an intermediate twin-engine multi-purpose helicopter designed and manufactured by PZL-Swidnik, an AgustaWestland company. The helicopter can be deployed in a wide range of missions conducted by the military, government and other law enforcement authorities.
The helicopter is capable of providing enhanced operational capabilities in a variety of applications such as search and rescue missions, medical evacuations, fire fighting, cargo and troop transport, emergency medical services, passenger and VIP transport and other utility operations.
Orders and deliveries of the W-3A Sokol helicopter
AW109 Trekker is AgustaWestland's first light twin-engine helicopter with fixed landing skids.
The Philippine Air Force ordered a total of eight W-3A Sokol helicopters along with ground support equipment, training, spares and other support services to execute search and rescue operations in 2010. The deliveries began in April 2012 and concluded in February 2013.
The Polish Ministry of National Defence awarded five contracts, worth about €90m to PZL-Swidnik, for the delivery of five W-3A Sokol helicopters in January 2012. Deliveries were concluded in December 2013 and the helicopters have since been deployed with the Polish air force to carry out VIP transport services. The W-3A Sokols are also in service with the Czech Republic air force.
PZL-Swidnik was awarded a contract by the Ministry of Internal Affairs of Uganda for the supply of a W-3A Sokol and comprehensive training and support services in July this year. The helicopter is scheduled for delivery in 2015 and will be deployed with the Uganda Police to conduct law enforcement operations in the nation.
W-3A Sokol design and features
The flexible design of the W-3A Sokol incorporates a variety of equipment as well as internal and external cargo capacities. The twin-engine helicopter delivers rugged and reliable operations in all climatic and environmental conditions, day and night.
The W-3A Sokol has a length of 18.79m with rotors turning, a maximum height of 4.2m and a width of 1.75m. The basic empty weight of the helicopter is 3,850kg, the maximum useful load is 2,550kg and the maximum take-off weight is 6,400kg.
The helicopter has three 3.03m long tail rotor blades and four composite, fully articulated, 15.7m long main rotor blades that deliver high efficiency and inertia for safe auto-rotation. The main rotor blades incorporate electrical heating elements and wind-shields for missions in difficult weather conditions. The helicopter also features a rugged fixed tricycle landing gear fitted with fully castoring nose gear and large tires.
W-3A Sokol is controlled by a pilot and a co-pilot. The helicopter features an expansive cabin that can accommodate up to 12 passengers, as well as cargo and other equipment.
The helicopter is attached with an electric hoist for lifting personnel or cargo of about 272kg and an external cargo hook is also attached to carry an underslung load of about 2,100kg. A pendulum type vibration absorber is installed to reduce vibration levels. Other equipment includes a cargo transportation kit, rescue hoist, wire strike protection system, belly water tank, roping installation, rappelling kit and a high-intensity search light.
Cockpit and avionics onboard the helicopter
The cockpit is equipped with a four-axis automatic flight control system (AFCS), a night vision goggle (NVG) system and LCD cockpit displays enhance the helicopter's situational awareness.
Navigation and communications systems include a weather radar, instrument landing system, forward looking infrared (FLIR) / TV system with video, flight data recorders, automatic direction finder, cockpit voice recorders, HF, VHF/FM, intercom and secure radio communication, transponder, global positioning system (GPS), encoder, gyrocompass, radio altimeter and an external loudspeaker system.
Propulsion and performance of the multi-purpose helicopter
The W-3A Sokol helicopter is powered by two WSK PZL-Rzeszow PZL 10W turboshaft engines that generate a take-off power of 662kW and a maximum continuous power of 574kW each. The twin-engine helicopter also features a continuous restart engine system.
The standard and auxiliary fuel capacities of the helicopter are 1,720l and 730l respectively. The helicopter, which can climb at a rate of 8.5m/s, can fly for up to four hours and twelve minutes.
The propulsion system enables the helicopter to fly at a maximum cruise speed of 235km/h, a never exceeding speed of 260km/h and has a maximum range of 734km and a service ceiling of 4,520m.