49 CFR § 1544.3 - TSA inspection authority.
(a) Each aircraft operator must allow TSA, at any time or place, to make any inspections or tests, including copying records, to determine compliance of an airport operator, aircraft operator, foreign air carrier, indirect air carrier, or other airport tenants with -
(1) This subchapter and any security program under this subchapter, and part 1520 of this chapter; and
(2) 49 U.S.C. Subtitle VII, as amended.
(c) TSA may enter and be present within secured areas, AOAs, SIDAs, and other areas where security measures required by TSA are carried out, without access media or identification media issued or approved by an airport operator or aircraft operator, in order to inspect or test compliance, or perform other such duties as TSA may direct.
(d) At the request of TSA and the completion of SIDA training as required in a security program, each aircraft operator must promptly issue to TSA personnel access and identification media to provide TSA personnel with unescorted access to, and movement within, areas controlled by the aircraft operator under an exclusive area agreement.