Polish helicopter manufacturer PZL-Swidnik is fitting a hydraulic flight-control system from French manufacturer SAMM to its third SW-4 light-helicopter prototype.
The four/five-seat helicopter, powered by a single 335kW (450shp) Allison 250-C20R/2 turboshaft has undergone 70h of flight testing since it was first flown on 26 October, 1996, and is now grounded until the second quarter of 1998 while the modifications are carried out. One hydraulic system has been delivered, says Swidnik, and, if flight tests are successful, more will be bought and the system will become a standard equipment.
The third prototype is the only one of four which has been flown. The first two prototypes are being used for static and dynamic ground tests, respectively, while the fourth, now complete with improved skids, has yet to undergo its first flight.
The company now plans to offer a version powered by the 460kW Pratt & Whitney Canada PW200/9 turboshaft.
Source: Flight International
