(a) If the Administrator finds that the remedial plan is designed and effective to correct the nonconformity, he/she will so notify the manufacturer or remanufacturer in writing. If the remedial plan is not approved, the Administrator will provide the manufacturer or remanufacturer notice of the disapproval and the reasons for the disapproval in writing.

(b) Upon receipt of notice from the Administrator that the remedial plan has been approved, the manufacturer or remanufacturer shall commence implementation of the approved plan. Notification of locomotive or locomotive engine owners shall be in accordance with requirements of this subpart and shall proceed as follows:

(1) When no public hearing as described in §92.709 is requested by the manufacturer or remanufacturer, notification of locomotive or locomotive engine owners shall commence within 15 working days of the receipt by the manufacturer or remanufacturer of the Administrator's approval unless otherwise specified by the Administrator.

(2) When a public hearing as described in §92.709 is held, unless as a result of such hearing the Administrator withdraws the determination of nonconformity, the Administrator shall, within 60 days after the completion of such hearing, order the manufacturer or remanufacturer to provide prompt notification of such nonconformity.