14 CFR § 5.7

Any person authorized to conduct operations under part 121 of this chapter that has an SMS acceptable to the FAA on or before May 28, 2024, must revise its SMS to meet the requirements of this part no later than May 28, 2025.

Any person applying for authorization to conduct operations under part 121 of this chapter or with such application pending on or after May 28, 2024, must develop and implement an SMS that meets the requirements of this part.

Any person required to develop and implement an SMS under this section must maintain the SMS as long as the person is authorized to conduct operations under part 121 of this chapter.

Any person required to develop and implement an SMS under this section must make available to the Administrator, upon request, all necessary information and data that demonstrates that the person has an SMS that meets the requirements set forth in this part.