In order to get approval from FAA to produce items to a Technical Standard Order (TSO) standard, the TSO item manufactures need to obtain Technical Standard Order Authorization (TSOA). It’s necessary to do research for the process of obtaining TSOA to ensure that TSO item manufacture is authorized. This paper takes Aircraft Certification Office (ACO) as baseline, shows the process of obtaining TSOAs and makes clear the authority requirements for the TSO item manufactures by analyzing the responsibilities of ACO. The paper can provide guides of obtaining TSOA for the manufacture.