Final answer:
The Maximum Flight Duty Period may be extended before takeoff primarily in the case of emergencies or unforeseen circumstances. Pilot's consent may also be considered, but regulatory compliance and safety are paramount in such decisions.
Step-by-step explanation:
Before takeoff, the Maximum Flight Duty Period (FDP) may be extended in certain circumstances such as an emergency or unforeseen conditions that could not be anticipated prior to the commencement of the duty period. This can include but is not limited to weather delays, equipment malfunctions, or other operational disruptions. While pilot's consent may also be a factor in extending flight duty periods, it is often regulatory bodies and airline operational rules that detail how and when these extensions can take place, emphasizing safety and pilot's fatigue management.
It's important to note that the specifics can vary by country and the governing civil aviation authorities, such as the FAA in the United States or EASA in Europe, which have their own strict regulations regarding FDP extensions. In any case, these extensions should be carefully considered with both safety and regulatory compliance in mind.