What should be completed once established on downwind during the normal landing pattern?

Once established on downwind during the normal landing pattern, the Before Landing Checklist should be completed as a standard procedure. This checklist ensures that all necessary pre-landing items are addressed, which is essential for a safe approach and landing. Completing this checklist at this stage allows the pilot to confirm that the aircraft is configured properly and that all critical systems are checked before transitioning to the final approach phase.

Performing the Before Landing Checklist at this point helps reduce the workload during the landing sequence, allowing the pilot to focus on flying the aircraft and monitoring the approach. This practice contributes to greater situational awareness and overall safety during the landing process, as it reinforces the important task of confirming aircraft readiness and minimizing distractions.

The other options are associated with different phases of flight and do not align with established procedures for the downwind leg of the landing pattern. For instance, the After Landing Checklist is typically used once the aircraft has landed and exited the runway, while the Pre-Takeoff Checklist is completed prior to takeoff. The Post-Flight Checklist occurs after the flight is completed and does not pertain to the time spent in the landing pattern.