Helicopter Sikorsky HO4S-3 Serial 55-582 Register 138577 used by US Navy USN. Built 1953. Aircraft history and location Aircraft History 138577 US Navy 1953-11-10Sikorsky S-55 c/n 55-582, ff:? del USN as HO4S-3, 138577, 10Nov53. Send Updates Use APP to upload photo @ (optional) When Now? / / Send
