49 CFR §385.413

1. (a)If a motor carrier receives a proposed safety rating that is less than Satisfactory and does not already have a safety permit, it will not be issued a safety permit (including a temporary safety permit) unless and until a Satisfactory safety rating is issued to the motor carrier.
2. (b)If a motor carrier receives a proposed safety rating that is less than Satisfactory and holds a safety permit (including a temporary safety permit), the safety permit will be subject to revocation or suspension (see § 385.421).