((a))
((1)) The chief judge of the circuit shall be the circuit judge in regular active service who is senior in commission of those judges who—
((A)) are sixty-four years of age or under;
((B)) have served for one year or more as a circuit judge; and
((C)) have not served previously as chief judge.
((2))
((A)) In any case in which no circuit judge meets the qualifications of paragraph (1), the youngest circuit judge in regular active service who is sixty-five years of age or over and who has served as circuit judge for one year or more shall act as the chief judge.
((B)) In any case under subparagraph (A) in which there is no circuit judge in regular active service who has served as a circuit judge for one year or more, the circuit judge in regular active service who is senior in commission and who has not served previously as chief judge shall act as the chief judge.
((3))
((A)) Except as provided in subparagraph (C), the chief judge of the circuit appointed under paragraph (1) shall serve for a term of seven years and shall serve after expiration of such term until another judge is eligible under paragraph (1) to serve as chief judge of the circuit.
((B)) Except as provided in subparagraph (C), a circuit judge acting as chief judge under subparagraph (A) or (B) of paragraph (2) shall serve until a judge has been appointed who meets the qualifications under paragraph (1).
((C)) No circuit judge may serve or act as chief judge of the circuit after attaining the age of seventy years unless no other circuit judge is qualified to serve as chief judge of the circuit under paragraph (1) or is qualified to act as chief judge under paragraph (2).
((b)) The chief judge shall have precedence and preside at any session of the court which he attends. Other circuit judges of the court in regular active service shall have precedence and preside according to the seniority of their commissions. Judges whose commissions bear the same date shall have precedence according to seniority in age. The circuit justice, however, shall have precedence over all the circuit judges and shall preside at any session which he attends.
((c)) If the chief judge desires to be relieved of his duties as chief judge while retaining his active status as circuit judge, he may so certify to the Chief Justice of the United States, and thereafter the chief judge of the circuit shall be such other circuit judge who is qualified to serve or act as chief judge under subsection (a).
((d)) If a chief judge is temporarily unable to perform his duties as such, they shall be performed by the circuit judge in active service, present in the circuit and able and qualified to act, who is next in precedence.