What is the 5-10-15 rule concerning aircraft fuel management?

The 5-10-15 rule is a guideline used in aircraft fuel management to ensure safety and prevent running out of fuel. This rule suggests that pilots should refuel when the fuel level reaches less than 5 gallons to maintain immediate operational needs, less than 10 gallons to account for safety margins, and have 15 gallons in reserve to handle unforeseen circumstances such as delays in landing or additional flight requirements.

By following this rule, pilots can maintain sufficient fuel for takeoff and for dealing with any emergencies that may arise, such as needing to hold for clearance before landing or diverting to another airport. This approach enhances safety by ensuring that there is enough fuel to manage unexpected situations while also taking into account the operational needs of the aircraft.

Understanding and adhering to this rule is crucial in flight operations, making option C the appropriate choice as it emphasizes a comprehensive fuel management strategy that includes immediate, safety, and reserve considerations.