49 CFR § 385.11 - Notification of safety fitness determination.
(a) The FMCSA will provide a motor carrier written notice of any safety rating resulting from a compliance review as soon as practicable, but not later than 30 days after the review. The notice will take the form of a letter issued from the FMCSA's headquarters office and will include a list of FMCSR and HMR compliance deficiencies which the motor carrier must correct.
(b) If the safety rating is “satisfactory” or improves a previous “unsatisfactory” safety rating, it is final and becomes effective on the date of the notice.
(c) In all other cases, a notice of a proposed safety rating will be issued. It becomes the final safety rating after the following time periods:
(d) A proposed safety rating of “unsatisfactory” is a notice to the motor carrier that the FMCSA has made a preliminary determination that the motor carrier is “unfit” to continue operating in interstate commerce, and that the prohibitions in § 385.13 will be imposed after 45 or 60 days if necessary safety improvements are not made.