goods. Due to the sudden withdrawal of customs duty on crude oil on 25.06.2011, as the appellant was not in a position to utilize the benefits of Advance Authorisation Scheme decided to convert to Duty Drawback Scheme for realisation of export benefits. Accordingly, the Appellant vide letter dated 26.07.2011 sought for conversion of shipping bills filed under Advance Authorisation scheme into Duty Drawback Scheme. The Assistant Commissioner of Customs, Mangalore vide letter dated 01.08.2012 intimated that the Commissioner of Customs, Mangalore had accorded permission for conversion of 286 shipping bills filed for the period from 27.03.2011 to 26.06.2011 from Advance Authorisation Scheme to Duty Drawback Scheme. However, as the appellant did not get any communication in respect of the status of the approval for conversion of the remaining shipping bills, the Appellant vide letter dated 12.12.2012 requested for conversion of remaining 164 shipping bills filed for the period from 01.03.2011 to 26.03.2011 and 27.06.2011 to 30.07.2011. The appellant was informed by the Assistant Commissioner of Customs, Mangalore vide letter dated 03.04.2013 that the Commissioner of Customs, Mangalore had rejected the request for conversion of shipping bills for the above periods on time bar by placing reliance on condition 3(a) of the Circular No.36/2010-Cus. dated 23.09.2010. Thereafter, the Appellant sought for personal hearing for contesting the rejection of conversion of shipping bills. The Assistant Commissioner of Customs, Mangalore vide letter dated 31.07.2013 informed the appellant that the Commissioner had rejected the request based on the condition 3(a) of the Circular No. 36/2010-Cus dated 23.09.2010. In view of the above, the Appellant had filed an appeal before this Tribunal on the communication dated 03.04.2013. This