Which condition indicates a more severe problem during the troubleshooting process?

A problem that becomes more pronounced during takeoff is indicative of a more severe issue because this phase of flight involves significant changes in thrust, airspeed, and load on the aircraft systems. During takeoff, the aircraft is subjected to higher stress conditions, and any malfunction that manifests then can have critical implications for safety and performance. If an issue arises during this phase, it suggests that the problem may be related to essential flight systems that are particularly sensitive at higher power settings or under rapid throttle changes.

While persistent problems during cruising and intermittent issues can also signal concerns, they may not represent the immediate danger associated with takeoff-related issues. Problems that only happen under specific, less critical circumstances, such as only on weekends, may point to situational factors rather than inherent system flaws. Therefore, when troubleshooting, the focus should be prioritized on problems that exhibit severity during critical phases of flight, such as takeoff, as these directly affect safety and operational integrity.