Which step is NOT part of the control and performance concept when flying instruments?

The control and performance concept in instrument flying centers around the pilot's ability to manage and monitor both control and performance instruments to ensure safe and accurate flight.

When considering the steps involved, engaging the autopilot for all phases of flight cannot be considered a part of the core concept. While autopilots can aid in maintaining flight parameters, the control and performance concept emphasizes active management by the pilot, particularly during critical phases such as takeoff, landing, and maneuvering.

The other steps, such as adjusting control instruments as necessary, referencing performance instruments, and trimming for hands-off flight, are integral to actively piloting the aircraft. These actions ensure pilots are continually aware of the aircraft's performance and can make timely adjustments to controls as needed, fostering effective situational awareness and aircraft control. Therefore, prioritizing manual control and performance monitoring highlights the importance of pilot engagement, which is not achieved through relying solely on autopilot.