law: 38. Member to act as Chairperson in certain circumstances.-
  (1) In the event of the occurrence of any vacancy in the office of the Chairperson of the Appellate Tribunal by reason of his death, resignation or otherwise, the senior-most Member shall act as the Chairperson until the date on which a new Chairperson, appointed in accordance with the provisions of this Act to fill such vacancy, enters upon his office.
  (2) When the Chairperson is unable to discharge his functions owing to absence, illness or any other cause, the senior-most Member shall discharge the functions of the Chairperson until the date on which the Chairperson resumes his duties.