When is the beta target displayed?

The beta target is displayed under specific conditions that are primarily linked to engine performance and aircraft configuration. The correct choice indicates that the beta target appears when the aircraft is in CONF 1 - 3 configurations, which typically correspond to different settings for takeoff and landing flaps. In addition, for the beta target to be displayed, at least one engine's EPR (Engine Pressure Ratio) must exceed 1.25, and there must be a significant difference of more than 0.25 between the EPRs of the two engines.

This condition is crucial because it highlights a scenario that generally requires careful monitoring of engine performance, particularly when operating near or at the limits of their capabilities. In such configurations, the displayed beta target serves as a visual cue for pilots, indicating that they need to manage their thrust more carefully to maintain optimal performance and aircraft control.

The other options describe configurations and conditions that do not meet the required criteria for displaying the beta target. Hence, they do not provide the necessary parameters related to engine performance or specific aerodynamic configurations that trigger the display of the beta target.