What is the first check performed after starting the engine?

The first check performed after starting the engine is to check the oil pressure, ensuring it is in the green range after a few seconds of operation. This is crucial because oil pressure indicates that the engine is receiving adequate lubrication, which is essential for proper functioning and to prevent engine damage. If the oil pressure does not rise within a few seconds after starting the engine, it may indicate a problem with the oil system, such as insufficient oil levels or a malfunctioning oil pump.

Performing this check promptly helps ensure that the engine is operating safely before proceeding with further checks or takeoff. While monitoring fuel flow, electrical system voltage, and temperature gauges are important during engine operations, they are typically secondary checks performed after confirming that the oil pressure is within the safe range.