Tax exemption for National Aviation Security Fee Trust: specified aviation security receipts exempt subject to compliance conditions. Notification under clause (46) of section 10 of the Income-tax Act, 1961 notifies the National Aviation Security Fee Trust as eligible for exemption in respect of specified receipts: grants or subsidy approved by the Ministry of Civil Aviation; Aviation Security Fee collected at Ministry-prescribed rates; amounts transferred from escrow accounts of passenger service fee (security component) for the Ministry; and interest on bank deposits. The exemption is subject to conditions that the trust shall not engage in commercial activity, its activities and specified income remain unchanged through the financial years, and it files returns under clause (g) of sub section (4C) of section 139.