Helicopter Sikorsky HO4S-3 Serial 55-527 Register 138498 used by US Navy USN. Built 1953. Aircraft history and location Aircraft History 138498 US Navy 1953-09-04Sikorsky S-55 c/n 55-527, ff:? del USN as HO4S-3, 138498, 04Sep53. 1957-12-03 w/o 03dec57 Ross Ice Shelf, Antarctica Send Updates Use APP to upload photo @ (optional) When Now? / / Send
