49 CFR §1540.3

1. (a)Where the Administrator is named in this subchapter as exercising authority over a function, the authority is exercised by the Administrator or the Deputy Administrator, or any individual formally designated to act as the Administrator or the Deputy Administrator.
2. (b)Where TSA or the designated official is named in this subchapter as exercising authority over a function, the authority is exercised by the official designated by the Administrator to perform that function.