Component of the INA complex (INAC) that promotes the biogenesis of mitochondrial F(1)F(0)-ATP synthase. INAC facilitates the assembly of the peripheral stalk and promotes the assembly of the catalytic F(1)-domain with the membrane-embedded F(0)-domain. Component of the inner membrane assembly (INA) complex, composed of INA17 and INA22. Interacts with a subset of F(1)F(0)-ATP synthase subunits of the F(1)-domain and the peripheral stalk. Present with 589 molecules/cell in log phase SD medium.