Helicopter Sikorsky S-55 Serial 55-757 Register 6313 HS-3 used by Royal Thai Air Force. Built 1954. Aircraft history and location Aircraft History For HS-3 see also mi-8t 133 03 HS-3 Royal Thai Air Force 1954-07-23Sikorsky S-55 c/n 55-757, ff:? del RTAF as HS-3, 23Jul54. HS3-3/97 preserved Don Muang 6313 Royal Thai Air Force asgd 63 Sqn, 6th Wing, Royal Thai Air Force, reser: 6313, unk. Send Updates Use APP to upload photo @ (optional) When Now? / / Send