Detailed history and photos of helicopter Sikorsky HO4S-3 Serial 55-607 Register 138522 used by US Navy USN Track service timeline and current status. Aircraft History 138522 US Navy 1953-12-03Sikorsky S-55 c/n 55-607, ff:? del USN as HO4S-3, 138522, 03Dec53. Send Updates Use APP to upload photo @ (optional) When Now? / / Send
