Where must you enter for the 45º/180º, 80º/260º, or base turn reversal procedures?

Entering for the 45º/180º, 80º/260º, or base turn reversal procedures requires a specific approach to ensure proper navigation and safety during the maneuver. The correct entry point is from an entry sector that includes the reciprocal of the inbound track. This ensures that the aircraft is aligned properly to make the turn effectively, allowing pilots to execute the procedure while maintaining the necessary altitude and airspeed.

The procedures are designed to help pilots navigate in a way that facilitates a safe and efficient transition back toward the runway after a missed approach or during a repositioning maneuver. By entering from a sector that incorporates the reciprocal of the inbound track, pilots can better anticipate the required turns and adjustments to maintain the correct flight path.

The other options suggest entry points that do not adequately align with the intended flight path or could lead to confusion, potentially increasing the risk of error during the maneuver. Thus, the entry sector encompassing the reciprocal track is critical for maintaining situational awareness and ensuring a successful execution of the turns involved in these specific aerial procedures.