What can be a consequence of not adhering to flight duty period restrictions?

The consequence of not adhering to flight duty period restrictions is a significantly increased likelihood of accidents. These regulations are in place to ensure that flight crew members do not become fatigued, as fatigue can impair cognitive functions, reaction times, and overall decision-making abilities. When flight crews exceed their allowable duty periods, they may experience reduced alertness and an increased chance of making critical errors during flight operations. This is particularly crucial in aviation, where safety is paramount, and even small lapses in attention can lead to serious incidents or accidents.

While the other choices may suggest potential scenarios related to flight operations, they do not accurately reflect the primary safety concern associated with ignoring these regulatory limits. Increased efficiency or improved crew morale are unlikely when crew members are exhausted, and while missing flights can occur due to various operational issues, it is not a direct consequence of disregarding flight duty limitations. The main focus remains on safety, which underlines the importance of adhering to these regulations to minimize risks in aviation.