Helicopter Sikorsky HO5S-1 Serial 52-020 Register 125527 used by US Marine Corps USMC. Built 1952. Aircraft history and location Aircraft History 125527 US Marine Corps 1952-04-30Sikorsky S-52-3, c/n 52-020, ff:? acc BuAerRep (BAR) East Hartford, CT, 30Apr52 del USMC as HO5S-1, 125527, 06May52. 1957-02soc feb57 Send Updates Use APP to upload photo @ (optional) When Now? / / Send