The A/THR RETARD mode is ONLY available during a(n) ____landing.

The A/THR RETARD mode is exclusively available during an automatic landing because, in this scenario, the Autothrust system manages thrust as part of its operational parameters during the landing phase. When the aircraft is in an automatic landing configuration, the system is designed to automatically reduce thrust to idle at the appropriate moment as the aircraft approaches touchdown. This ensures a smooth and controlled landing.

Manual landings typically rely on direct pilot control of the thrust levers, thus not utilizing the benefits of the A/THR system to its fullest extent. Emergency scenarios may require different procedures that could bypass standard autothrust operations. Similarly, crosswind landings focus more on maintaining lateral control rather than modifying the autothrust limitations. Therefore, the RETARD function is specifically optimized for scenarios where automation takes precedence, which includes the automatic landing process, ensuring a safe and effective landing operation.