Helicopter Sikorsky HO4S-3 Serial 55-504 Register 138494 used by US Navy USN. Built 1953. Aircraft history and location Aircraft History 138494 US Navy 1953-07-24Sikorsky S-55 c/n 55-504, ff:? del USN as HO4S-3, 138494, 24Jul53. 1956-01-14 w/o 14jan56 Send Updates Use APP to upload photo @ (optional) When Now? / / Send
