What is the proper performance requirement when established on the downwind leg?

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The proper performance requirement when established on the downwind leg includes conducting the Before Landing Checklist. This is a crucial step in the approach procedure as it ensures that all necessary preparations for landing are completed in a timely manner. By performing the checklist, the pilot can verify that all systems are functioning correctly, that the aircraft is properly configured for landing, and that any pertinent considerations such as fuel state and approach speeds are reviewed before entering the final stages of the approach.

Other options, while relevant in their own contexts, do not encapsulate the procedural requirement for the downwind leg as effectively. Speed maintenance, gear lowering, and aircraft configuration are all important aspects of preparing for landing, but the checklist acts as a comprehensive framework that confirms these tasks and helps to mitigate the risk of overlooking any critical steps.