CFR › Title 14 › Part 27 › §27.114714 CFR §27.1147Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkIf there are mixture controls, each engine must have a separate control and the controls must be arranged to allow—(a)Separate control of each engine; and(b)Simultaneous control of all engines.