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 (PubMed:28176794). Interacts with HEATR2; probably involved in outer arm dynein assembly (PubMed:25232951). Located in the proximal region of respiratory cilia. Highly expressed in trachea and testis. Expressed in respiratory ciliated cells (at protein level) (PubMed:33139725). The disease is caused by variants affecting the gene represented in this entry. Belongs to the dynein intermediate chain family. Intron retention.