14 C.F.R. § 142.31 – Advertising limitations.

(a) A certificate holder may not conduct, and may not advertise to conduct, any training, testing, and checking that is not approved by the Administrator if that training is designed to satisfy any requirement of this chapter.
(b) A certificate holder whose certificate has been surrendered, suspended, revoked, or terminated must—
1. (1) Promptly remove all indications, including signs, wherever located, that the training center was certificated by the Administrator; and
2. (2) Promptly notify all advertising agents, or advertising media, or both, employed by the certificate holder to cease all advertising indicating that the training center is certificated by the Administrator.