materials. The SW-4 uses hydraulic flight controls, the rotorcraft has been promoted as possessing excellent flight controls, and can be flown in both day and night visual flight rules conditions. The SW-4 is capable of transporting up to five people, including a pilot, in crashworthy seats; passengers are provided with a high level of external visibility and comfort, an optional vibration absorption system is also offered. The main cabin can be rapidly reconfigured between passenger and cargo-carrying configurations and is accessed via two sliding doors on either side of the cabin, a dedicated baggage compartment is also present beneath the main cabin. PZL- Świdnik stated that multi-role operations had been a high priority during the SW-4's development; and that the rotorcraft is well-suited to passenger transport, primary and advanced training, patrol and surveillance missions. Various optional equipment can be installed, such as removable co-pilot flight controls, wire strike protection system, a forward looking infrared (FLIR) sensor system, instrument flight rules (IFR) training fittings, radio altimeter, emergency medical system, moving map, external loudspeakers and/or search light, flotation gear, and an external cargo sling. Much of the external equipment is designed to be held on external extension arms; overall, the SW-4 can mount/carry a useful payload of up to nearly 600 kilograms. Both basic and advanced trainer variants of the SW-4 have been developed to conform with NATO standards and military pilot training regulations, it is promoted as possessing a high level of inherent flight stability and safety; the advanced model is compatible with night vision goggles (NVG) and is equipped with an emergency simulation unit. Operators Military operators Polish Air Force Specifications (SW-4) See also References External links List of all SW-4 helicopters used by Polish Air Force Description on manufacturer's page SW-4 Production list, Program history SW-4 Photo gallery 1990s Polish helicopters 1990s Polish civil utility aircraft 1990s Polish military utility aircraft SW-4 Single-turbine helicopters Aircraft first flown in 1996