When to I have to update my CT number?
If no changes take place, you would have to update the CT registration every six years. However, if changes in the name of the person who signed the form take place, the form must be updated. Also, if you add or delete services (such as beginning work on MC331 trailers) you must update the form. If you hold an “R” stamp, you must update the form when that stamp is renewed. (See 49CFR107.504 (c ).