Which of the following is NOT a component of the RMI?

The flight director is not a component of the Radio Magnetic Indicator (RMI). The RMI primarily operates using magnetic bearings to guide pilots, utilizing components such as a double-barreled bearing indicator, a rotating compass card, and a single-barreled bearing indicator to display relative and magnetic bearings to navigational aids.

The double-barreled and single-barreled indicators offer pilots the capability to track multiple navigational aids simultaneously or focus on a single source of bearing information, respectively. The rotating compass card visually represents the magnetic heading of the aircraft, which provides critical situational awareness during flight. The flight director, on the other hand, is a separate instrument designed to assist pilots in following a prescribed flight path or maintaining a specific attitude, but it does not serve a function within the RMI framework.