49 CFR §385.325

1. (a)If the new entrant provides evidence of corrective action acceptable to the FMCSA within the time period provided in § 385.319(c), including any extension of that period authorized under § 385.323, the FMCSA will provide written notification to the new entrant that its DOT new entrant registration will not be revoked and it may continue operations.
2. (b)If a new entrant, after being notified that it is required to take corrective action to improve its safety management practices, fails to submit a written response demonstrating corrective action acceptable to FMCSA within the time specified in § 385.319, and any extension of that period authorized under § 385.323, FMCSA will revoke its new entrant registration and issue an out-of-service order effective on:
   1. (1)Day 61 from the notice date for new entrants subject to § 385.319(c)(1).
   2. (2)Day 46 from the notice date for new entrants subject to § 385.319(c)(2).
   3. (3)If an extension has been granted under § 385.323, the day following the expiration of the extension date.
3. (c)The new entrant may not operate in interstate commerce on or after the effective date of the out-of-service order.