Which of the following situations necessitates a manual abortion of the engine start?

A manual abortion of the engine start is necessary when the Interstage Turbine Temperature (ITT) rises above 1000 °C. This situation indicates that the engine is experiencing excessive temperatures that could lead to serious damage to the engine components. Controlling the ITT is crucial during the start sequence because high temperatures can compromise the engine's integrity, potentially resulting in a catastrophic failure if not addressed promptly.

Monitoring ITT is part of standard engine start procedures, and a reading exceeding 1000 °C suggests an abnormal condition that should be corrected immediately for safety and operational integrity. Proper handling of engine parameters during the start phase is essential to ensure the longevity and performance of the engine.

In contrast, consistent N1 increase, a fuel flow indication, or high battery levels, while important, do not immediately require a manual abortion of the start process. Consistent N1 increase indicates a normal starting sequence. Fuel flow indicating a start suggests the engine is initiating its run-up, which may be within normal parameters as long as other conditions are monitored. High battery levels do not necessitate aborting the start unless they are linked to other malfunctions.