Text in force at 23-63: from 23-43, effective 10 May 1993.
(a) Ignition switches must control [and shut off ]each ignition circuit on each engine.
(b) There must be means to quickly shut off all ignition on multiengine airplanes by the groupings of switches or by a master ignition control.
(c) Each group of ignition switches, except ignition switches for turbine engines for which continuous ignition is not required, and each master ignition control must have a means to prevent its inadvertent operation.
58 FR 18974 · Source