57C. Hearing of the appeal or application.

(1) If the Appellate Tribunal does not reject the appeal summarily, it shall fix adate for its hearing and send a notice to the appellant and the Commissioner. The Appellate Tribunal may, before deciding the appeal, hold such further enquiry or direct it to be held by the authority against whose decision the appeal has been preferred, as may appear necessary to the Appellate Tribunal. The Commissioner may be represented by a person authorized by him.

(2) The Appellate Tribunal shall not, for the first time receive in evidence on behalf of the appellant, an account, register, record or other documents, unless it is satisfied that the appellant was prevented by sufficient cause from producing such documents before the authority against whose order the appeal has been preferred.

(3) The Appellant Tribunal shall not, at the hearing of appeal allow the appellant to go into any ground of appeal not specified in memorandum of appeal unless the Appellate Tribunal is satisfied that omission of that ground therefrom was not willful or unreasonable.