Helicopter Sikorsky HO4S-3G Serial 55-1146 Register 1331 used by US Coast Guard USCG. Built 1958. Aircraft history and location Aircraft History 1331 US Coast Guard 1958-01-31Sikorsky S-55 c/n 55-1146, ff:? del USCG as HO4S-3G, 1331, 31Jan58. Send Updates Use APP to upload photo @ (optional) When Now? / / Send