Helicopter Sikorsky S-55 Serial 55-882 Register VH-UHM N743A used by Humble Oil and Refining Company. Built 1955. Aircraft history and location Aircraft History N743A Humble Oil and Refining Company 1955-06-25Sikorsky S-55 c/n 55-882, ff:? del Humble Oil as N743A, 25Jun55. VH-UHM - ex N743A 1980 A YSSY seen rusting and rotorless at Sydney Airport so would assume it has been destroyed Send Updates Use APP to upload photo @ (optional) When Now? / / Send