Part of the dynein complex of respiratory cilia. Consists of at least two heavy chains and a number of intermediate and light chains (Probable). Interacts with DNAAF2 (By similarity). Interacts with DNAAF6/PIH1D3 (By similarity). Interacts with HEATR2; probably involved in outer arm dynein assembly (By similarity). Located in the proximal region of respiratory cilia. Belongs to the dynein intermediate chain family.