How is the FMA structured on the 737-800?

The FMA, or Flight Mode Annunciator, on the Boeing 737-800 is structured as a critical component of the aircraft's autopilot and flight control systems. It is organized into three distinct columns and two rows. This layout is designed to provide pilots with clear and concise information regarding the current flight modes of the aircraft's autopilot system.

The three columns typically represent different flight aspects, such as lateral, vertical, and autothrottle modes, while the two rows indicate the active modes for each of these aspects. This configuration allows pilots to easily interpret the flight situation at a glance, facilitating better situational awareness and decision-making during flight operations.

Understanding the FMA's structure is essential for effective operation of the aircraft, and recognizing this arrangement helps ensure that pilots can quickly assess and respond to the changing dynamics of flight control parameters.