(a) A certificate or rating issued to a repair station located in the United States is effective from the date of issue until the repair station surrenders the certificate and the FAA accepts it for cancellation, or the FAA suspends or revokes it.
CFR 14-145.55-2014 history
2014CFR 14-145.55-2014 Aeronautics and Space. Part145:Repair stations. Section145.55:Duration and renewal of certificate.