In the context of aircraft performance figures, what does the horizontal dashed line from point B to point D represent?

The horizontal dashed line from point B to point D represents the positive load limit factor on an aircraft performance graph. This factor indicates the maximum amount of load that an aircraft can sustain under positive conditions without structural failure. In essence, it defines the limits within which the aircraft can safely operate during maneuvers that generate positive load factors, such as climbing or turning.

When the load factor exceeds this value, the risk of structural damage increases significantly. The positive load limit is critical for pilots to understand as it ensures safety and compliance with the aircraft's design specifications. Adhering to these limits allows pilots to perform maneuvers within the aircraft's safe operational envelope.

Understanding this concept is vital as it helps pilots avoid situations that could lead to excessive stress on the aircraft's structure and promotes safe flying practices.