YAKOVLEV HAS BEEN forced to modify the winglet design of the Yak-130, the contender for the air force trainer requirement. Flight-tests revealed that the winglets were deforming in flight. Yakovlev has since flown the aircraft with the winglets removed. The Yak-130 is effectively the company's last stake in military aircraft manufacturing. The Yak-38 has been withdrawn from serviced while the Yak-41 was cancelled
Source: Flight International