What indicates a yellow triangle on the flight data display for the aft index in the ALIS application?

The indication of a yellow triangle on the flight data display in the ALIS application signifies that the aft index is within specified ranges that are critical for safe aircraft operation. Each type of aircraft has unique specifications for weight distribution, and a yellow triangle alerts the crew to a potentially concerning payload configuration that may affect aircraft performance and stability.

This symbol is designed to provide a visual warning to the flight crew that adjustments may be necessary to ensure that the aircraft is balanced properly. The designated ranges help maintain structural integrity and ensure that the center of gravity stays within limits that are safe for flight operations.

The other options refer to specific aft index ranges that may not encompass the necessary generality to apply across different aircraft types, which is why they do not capture the overall intention of the yellow triangle warning. Only the correct choice encapsulates the requirement of monitoring and adhering to the defined ranges specific to aircraft types for safe payload distribution.