What does the AFT Index represent in terms of aircraft balance?

The AFT Index is a numerical representation that specifically indicates the position of the center of gravity (CG) of the aircraft relative to its reference point, which is essential for ensuring proper aircraft balance. This index is expressed as a value that typically ranges from 0 to 100, providing a standardized way to assess how far aft (toward the tail) the CG is located.

Understanding that the AFT Index conveys the balance of the aircraft allows flight crews and engineers to ensure that it remains within safe limits for optimal performance and controllability. A value of 0 would generally mean the CG is at the forward limit, while a value closer to 100 indicates a CG that is further aft.

This nuanced understanding of the AFT Index is crucial, as maintaining the correct balance is key to avoiding issues such as stalling or difficulty in managing the aircraft during operations.