Where the Chairman or any other member of a Tribunal ¾

(a) is ill or absent; or

(b) disqualifies himself in respect of a particular appeal, whether by reason of the possibility of a conflict of interest or otherwise,

the Minister may appoint another eligible person to act as Chairman or member in his stead during the illness or absence or in the particular appeal, as the case may be, and the person so appointed shall while so acting have all the powers and perform all the duties of the Chairman or member in whose stead he is appointed to act.