What should be the first action after starting an aircraft engine?

The first action after starting an aircraft engine should be to adjust for proper RPM and check for desired indications on the engine gauges. This step is crucial because it ensures the engine is operating smoothly and within designated parameters. Monitoring engine gauges immediately after start allows the pilot to confirm that critical systems such as oil pressure, fuel pressure, temperature, and RPM are all within normal operating ranges.

By focusing on engine performance and conditions, pilots can detect any anomalies that might arise, such as unusual vibrations or warning lights, which could indicate underlying issues that need to be addressed before proceeding further with the flight. This proactive approach enhances safety by verifying the functionality of the aircraft systems before taxiing or taking off.

Other options, while important in the context of pre-flight and safety procedures, do not take precedence immediately after engine start. For instance, checking fuel levels is usually done as part of the pre-start checklist. Taxiing to the runway cannot occur until the engine has been confirmed as operating correctly, and notifying air traffic control typically follows the completion of pre-flight checks and before taxiing. Prioritizing engine monitoring is a standard practice that underscores the importance of engine reliability in aviation safety.