Sikorsky Aircraft Corp. announced the signing of an agreement with Carson Helicopters that will lead to the launch of a modernization program for the legendary S-61 Sikorsky helicopter.
Approximately 620 S-61 helicopters remain in service in both the commercial and military markets worldwide. The aircraft first began flying in 1959, and the more than 1,000 that were produced have flown 3.8 million flight hours combined.
