(1) What was the (a) nature of the technical problem that the presidential jet Inkwazi developed while the President, Mr Jacob G Zuma, was on a visit to the Republic of Burundi in February 2016 and (b) cost of leasing a standby aircraft to transport the President back to South Africa; (2) whether the flight crew of the specified standby aircraft had the necessary security clearances to transport the President back to South Africa; if not, (a) why not and (b) what is the position in this regard; if so, what are the relevant details?