Core component of the MITRAC (mitochondrial translation regulation assembly intermediate of cytochrome c oxidase complex) complex, that regulates cytochrome c oxidase assembly. Requires for coordination of the early steps of cytochrome c oxidase assembly with the synthesis of MT-CO1. {ECO:0000269|PubMed:22243966, ECO:0000269|PubMed:22356826}. This is the function of COX14 (cytochrome c oxidase assembly factor COX14, ENSG00000178449).