17. (1) The Corporation may, with the prior approval of the Government or in accordance with the terms of any general authority given to it by the Government,-(a) borrow money in Bangladesh or foreign currency for all or any of the purposes of the Corporation; ¹[ * * *] ²[(aa) secure the payment of any sum borrowed under clause (a) by hypothecation or mortgage of any aircraft owned by the Corporation;](b) raise capital by the issue of bonds, debentures and debenture-stock. (2) The Government may guarantee, in such manner and on such conditions as it thinks fit, the redemption or repayment of, and the payment of interest on, any bonds, debentures or debenture-stock issued by the Corporation.