(a) Acting Chairman. In the event that the Chairman of the Board is
temporarily disabled or unavailable to perform his or her duties as
prescribed in this chapter VII, he or she shall designate a permanent
member to serve as Acting Chairman until such time as the Secretary
designates an Acting Chairman. In the event that the Chairman is
physically unable to make such designation, the next senior permanent
member shall serve as Acting Chairman until such time as the Secretary
of Labor designates an Acting Chairman.
(b) Interim members. In the event that a permanent member of the
Board is temporarily unable to carry out his or her responsibilities
because of disqualification, illness, or for any other reason, the
Secretary of Labor may, in his or her discretion, appoint a qualified
individual to serve in the place of such permanent member for the
duration of that permanent member's inability to serve.