Helicopter Sikorsky HSS-1 / SH-34G Seabat Serial 58-18 Register 138476 used by US Navy USN. Built 1955. Aircraft history and location Aircraft History 138476 US Navy 1955-05-24Sikorsky HSS-1, c/n 58-18, ff? del USN as HSS-1 138476, 24May55 unit assignments unk redesig UH-34G, Oct62 wfu & stor MASDC as 3H0165, 01Oct70 soc Oct73. Send Updates Use APP to upload photo @ (optional) When Now? / / Send