Accessory subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I), that is believed not to be involved in catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone. Binds 1 FAD per subunit. Complex I is composed of 45 different subunits. This a component of the hydrophobic protein fraction (PubMed:28683319). Forms a complex including sicily, ND-42 and Hsp83; the complex is necessary to chaperone ND-42 in the cytoplasm before mitochondrial import; the interaction between sicily and ND-42 is direct and occurs preferably between the unprocessed forms in the cytoplasm (PubMed:23509070). Expressed in muscles (at protein level). RNAi-mediated knockdown leads to loss of ND-30 and reduced mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I) activity (PubMed:23509070). Larvae exhibit elevated reactive oxygen species (ROS) and an up-regulation of Hsp60 (PubMed:23509070). RNAi-mediated knockdown in the eye results in retinal degeneration exacerbated with aging and accompanied by high levels of ROS and accumulation of lipid droplets in the glia (PubMed:23509070, PubMed:25594180). RNAi-mediated knockdown in neurons results in lipid droplet accumulation and increased levels of peroxidated lipids (PubMed:25594180). Belongs to the complex I NDUFA10 subunit family.