Helicopter Sikorsky HRS-3 Serial 55-454 Register 137845 used by US Navy USN. Built 1953. Aircraft history and location Aircraft History 137845 US Navy 1953-06-05Sikorsky S-55 c/n 55-454, ff:? del USN as HRS-3, 137845, 05Jun53. Send Updates Use APP to upload photo @ (optional) When Now? / / Send
