Hyderabad, April 21: A city court on Wednesday convicted now defunct Kingfisher Airlines chairman Vijay Mallya in a cheque bounce case. The 14th Additiol Chief Metropolitan Magistrate convicted the industrialist under section 138 of Negotiable Instruments Act. The court will pronounce the quantum of punishment on May 5, said Ashok Reddy, lawyer of GMR Hyderabad Intertiol Airport Ltd. which filed the case.