Helicopter Sikorsky HO4S-3 Serial 55-525 Register 1303 used by US Coast Guard USCG. Built 1953. Aircraft history and location Aircraft History For 1303 see also 47g-1 1303 2015 407gxp 54574 1303 US Coast Guard 1953-10-05Sikorsky S-55 c/n 55-525, ff:? del USCG as HO4S-3, 1303, 05Oct53. 1954-01-20 w/o 20jan54 Port Angeles, WA Coast Guard Air Station Port Angeles Send Updates Use APP to upload photo @ (optional) When Now? / / Send