Catalyzes the decarbonylation of fatty aldehydes to alkanes. Requires the presence of ferredoxin, ferredoxin reductase and NADPH for in vitro decarbonylase activity (By similarity). Involved in the biosynthesis of alkanes, mainly heptadecane and pentadecane. a long-chain fatty aldehyde + H(+) + 2 NADPH + O2 = a long-chain alkane + formate + H2O + 2 NADP(+) Binds 2 metal cations per subunit. The catalytic dinuclear metal-binding site could be either a di-iron or a manganese-iron cofactor. Belongs to the aldehyde decarbonylase family.