What is the primary calculation adjustment made with split markers?

The primary calculation adjustment made with split markers relates to accounting for multi-engine performance. Split markers are used on the flight computer or performance calculation device to help pilots evaluate different performance variables that affect multi-engine aircraft. Such considerations may include the impact of engine failures, weight distribution, and the performance characteristics of each engine in operation or during an engine-out scenario.

When assessing performance in a multi-engine environment, the use of split markers allows pilots to adjust calculations for factors unique to multi-engine operations, ensuring a more accurate understanding of the aircraft's performance envelope under various conditions. This is crucial for safe flight planning and decision-making, especially during critical phases such as takeoff and landing, where engine performance can significantly influence required takeoff distance, climb rates, and safety margins.

Other choices, while pertinent to overall flight operations and performance calculations, do not specifically denote the primary use of split markers as they focus on different aspects such as cargo weight, atmospheric conditions, or aircraft configuration, which can be relevant but are not the main function of split markers in addressing multi-engine performance considerations.