Detailed history and photos of helicopter Sikorsky HO4S-3 Serial 55-628 Register 138528 used by US Navy USN Track service timeline and current status. Aircraft History 138528 US Navy 1954-01-05Sikorsky S-55 c/n 55-628, ff:? del USN as HO4S-3, 138528, 05Jan54. Send Updates Use APP to upload photo @ (optional) When Now? / / Send
