What does an arrow symbol pointing towards data on a line on the MCD screen indicate?

The arrow symbol pointing towards data on a line on the MCD (Multifunction Control Display) screen indicates that pushing the associated line select key will toggle through the values or choices indicated on the label line. This functionality allows pilots to select different options directly from the display by using the line select keys, streamlining the process of changing inputs or settings.

In this context, the arrow signifies that the pilot can engage with that line to cycle through various available options easily. Understanding this concept is crucial for efficient operation of the MCD, especially during critical flight operations where quickly accessing different settings can enhance situational awareness and responsiveness.

Recognizing the significance of the toggle functionality is essential for effectively using the MCD as it allows pilots to have direct control over specific data inputs, ensuring that they can modify settings as required while maintaining focus on other aspects of flight management.