What must be done every 2 years to maintain pilot currency?

To maintain pilot currency, it is essential to complete one of the specified training programs every two years. This requirement is in place to ensure that pilots keep their skills and knowledge up-to-date, which is critical for safety in aviation. The specified training programs can include various forms of training such as refresher courses or recurrent training that cover important aspects of flying, regulations, and new procedures that may have been implemented.

The other options, while important components of a pilot's skill set and proficiency checks, are not necessarily mandated to maintain currency every two years. Regular takeoffs and landings, flight examinations, or safety inspections contribute to a pilot’s overall competencies but are part of a broader set of requirements that vary depending on the specific licenses or ratings held. Hence, completing one of the outlined training programs is the proper way to ensure compliance with the currency requirements established by aviation regulations.