(1) Whether any of the specified aircraft in Squadron 21 of the SA Air Force have been refurbished; if not, why not; if so, in respect of each specified aircraft, (a) what refurbishment was done, (b) why was it done, (c) when and (d) what was the total cost of the refurbishment; (2) whether any plans are in place for any specified aircraft in Squadron 21 to be refurbished; if not, why not; if so, in respect of each specified aircraft, (a) what is the refurbishment being planned, (b) why is it being planned, (c) when is it scheduled to take place and (d) what is the total anticipated cost of the refurbishment?