Become a Sky-High Pro! Ace the CAAP CPL Air Law Exam 2026 and Soar to Success!

The term that describes the period when a pilot flies an aircraft solely by reference to instruments is "Instrument flight." This concept is crucial in aviation as it pertains to operations conducted under instrument flight rules (IFR), where pilots rely on their instruments rather than visual cues outside the aircraft. This type of flying is essential during poor weather conditions, where visibility may be impaired, requiring pilots to navigate and control the aircraft strictly using instrumentation.

In contrast, other terms such as "Pilot-in-command time," "Cross-country time," and "Total flight time" pertain to different aspects of flight experience and do not specifically indicate flights conducted solely by reference to instruments. Pilot-in-command time refers to the duration a pilot serves as the commanding pilot of the flight. Cross-country time involves flying from one location to another, typically over a certain distance, which may or may not involve instrument flying. Total flight time is a cumulative measure of all flight hours a pilot has logged, encompassing all types of flying without specifically indicating the use of instruments. Thus, "Instrument flight" is the precise term relevant to the question.