During the run-up check, what is usually verified?

The run-up check is a critical part of pre-flight procedures that involves verifying the performance and operational readiness of the aircraft before taking off. This check usually includes testing the engine systems, ensuring that the engine is operating smoothly and efficiently, and conducting checks on the flight controls to confirm they are functioning correctly and will respond as expected during flight.

During the run-up, pilots also typically monitor parameters such as RPM, manifold pressure, and engine temperatures. Additionally, checking the operation of the flight controls ensures that there are no unexpected responses, which could indicate mechanical issues. This thorough inspection is essential for ensuring the safety of the flight and verifying that all systems are functioning as intended before departure.

The other answer choices focus on different aspects of flight preparation: fuel levels and cargo weight relate more to loading considerations, while weather conditions and flight plans are typically reviewed earlier in the pre-flight preparations. Likewise, checking passenger readiness and seatbelt security, while important for safety, is part of boarding procedures rather than the technical assessment conducted during the run-up. Thus, the verification of engine performance and flight control operation is the primary focus during the run-up check.