Final answer:
The correct answer is option d) 12 hours within the preceding 24 hours (4 days).
Step-by-step explanation:
The correct answer is option d) 12 hours within the preceding 24 hours (4 days).
According to aviation regulations, before beginning any Flight Duty Period (FDP) or reserve availability, a pilot must have at least 12 consecutive hours of rest within the preceding 24 hours (4 days). This ensures that pilots have sufficient rest before undertaking their duties, reducing the risk of fatigue-related incidents.
For example, if a pilot finishes their previous duty at 3:00 pm, they must not begin their next duty until 3:00 pm the next day, after having had a minimum of 12 hours of rest.