Organization Act of the Civil Aeronautics Administration of the MOTC Article 5

The CAA is headed by a Director General, who is ranked Senior Grade 13 and is in charge of all CAA affairs, including directs and supervises all CAA personnel and organizations. The DG is assisted by 2 Deputy Director Generals, who are ranked Senior Grade 12.
中文原文 交通部民用航空局組織條例第5條
本局置局長一人,職務列簡任第十三職等,綜理局務,並指揮、監督所屬人員及機關;副局長二人,職務列簡任第十二職等,襄理局務。

English translation for reference only; the Chinese text prevails. Not legal advice.