S. 271AAB: Penalty-Search cases-Period of limitation-Penalty initiated in the assessment order, which was carried in appeal to the Commissioner (Appeals) and the Tribunal-Limitation governed by section 275(1)(a) and not the residuary clause (c)-Penalty order passed within six months of receipt of the Tribunal’s order is within limitation. [S. 132(4), 275(1)(a), 275(1)(c), Art. 226]