(a) The starting date for a period of ineligibility described in this section shall be:

(1) For a person not currently certified, the date of the railroad's written determination that the most recent incident has occurred; or

(2) For a person currently certified, the date of the railroad's notification to the person that recertification has been denied or certification has been suspended.

(b) A period of ineligibility shall be determined according to the following standards:

(1) In the case of a single incident involving a violation of one or more of the operating rules or practices described in § 245.303(e)(1) through (6), the person shall have their certificate revoked for a period of 30 calendar days.

(2) In the case of two separate incidents involving a violation of one or more of the operating rules or practices described in § 245.303(e)(1) through (6), that occurred within 24 months of each other, the person shall have their certificate revoked for a period of six months.

(3) In the case of three separate incidents involving violations of one or more of the operating rules or practices, described in § 245.303(e)(1) through (7), that occurred within 36 months of each other, the person shall have their certificate revoked for a period of one year.

(4) In the case of four separate incidents involving violations of one or more of the operating rules or practices, described in § 245.303(e)(1) through (7), that occurred within 36 months of each other, the person shall have their certificate revoked for a period of three years.

(5) Where, based on the occurrence of violations described in § 245.303(e)(7), different periods of ineligibility may result under the provisions of this section and § 245.115, the longest period of revocation shall control.

(c) Any or all periods of revocation provided in paragraph (b) of this section may consist of training.

(d) A person whose certification is denied or revoked shall be eligible for grant or reinstatement of the certificate prior to the expiration of the initial period of ineligibility only if:

(1) The denial or revocation of certification in accordance with the provisions of paragraph (b) of this section is for a period of one year or less;

(2) Certification is denied or revoked for reasons other than noncompliance with § 219.101 of this chapter;

(3) The person is evaluated by a railroad officer and determined to have received adequate remedial training;

(4) The person successfully completes any mandatory program of training or retraining, if that is determined to be necessary by the railroad prior to return to service; and

(5) At least one half of the pertinent period of ineligibility specified in paragraph (b) of this section has elapsed.