Detailed history and photos of helicopter Sikorsky HO4S-3 Serial 55-627 Register 138527 used by US Navy USN Track service timeline and current status. Aircraft History 138527 US Navy 1954-01-04Sikorsky S-55 c/n 55-627, ff:? del USN as HO4S-3, 138527, 04Jan54. Send Updates Use APP to upload photo @ (optional) When Now? / / Send
