5 CFR § 842.803 - Conditions for coverage.
(a) Rigorous positions.
(1) An employee's service in a position that has been determined by the employing agency head to be a rigorous law enforcement officer or firefighter position is covered under the provisions of 5 U.S.C. 8412(d).
(2) An employee who is not in a rigorous position, nor covered while in a secondary position, and who is detailed or temporarily promoted to a rigorous position is not covered under the provisions of 5 U.S.C. 8412(d).
(3) A first-level supervisor position may be determined to be a rigorous position if it satisfies the conditions set forth in § 842.802.
(b) Secondary positions.
(1) An employee's service in a position that has been determined by the employing agency head to be a secondary law enforcement officer or firefighter position is covered under the provisions of 5 U.S.C. 8412(d), if all of the following criteria are met:
(i) The employee, while covered under the provisions of 5 U.S.C 8412(d), moves directly (that is, without a break in service exceeding 3 days) from a rigorous position to a secondary position;
(ii) The employee has completed 3 years of service in a rigorous position, including any such service during which no FERS deductions were withheld; and
(iii) The employee has been continuously employed in a secondary position or positions since moving from a rigorous position without a break in service exceeding 3 days, except that a break in employment in secondary positions that begins with an involuntary separation (not for cause), within the meaning of 5 U.S.C. 8414(b)(1)(A), is not considered in determining whether the service in secondary positions is continuous for this purpose.
(2) An employee who is not a rigorous position, nor covered while in a secondary position, and who is detailed or temporarily promoted to a secondary position is not covered under the provisions of 5 U.S.C. 8412(d).
(c) Air traffic controller. An employee's service in a position that has been determined to be an air traffic controller position by the employing agency head is covered under the provisions of 5 U.S.C. 8412(e).
(d) Except as specifically provided in this subpart, an agency head's authority under this section cannot be delegated.