According to CNAF 3710, reserve fuel shall be a percentage of planned fuel requirements.

According to CNAF 3710, reserve fuel shall be a percentage of planned fuel requirements.

• A. 5%
• B. 10%
• C. 15%
• D. 20%

Answer: (B)

Reserve fuel is the extra fuel carried to cover unforeseen conditions during flight. CNAF 3710 requires this reserve to be a percentage of the planned fuel requirements, ensuring you have a safe margin without carrying unnecessary fuel. The specified percentage is ten percent. For example, if your planned fuel is 1,500 units, the reserve would be 150 units, making the total required fuel 1,650 units. Using ten percent keeps the margin consistent with regulatory guidance, whereas smaller percentages could leave you under-reserved, and larger percentages would unnecessarily increase takeoff weight and fuel burn.

Reserve fuel is the extra fuel carried to cover unforeseen conditions during flight. CNAF 3710 requires this reserve to be a percentage of the planned fuel requirements, ensuring you have a safe margin without carrying unnecessary fuel. The specified percentage is ten percent.

For example, if your planned fuel is 1,500 units, the reserve would be 150 units, making the total required fuel 1,650 units. Using ten percent keeps the margin consistent with regulatory guidance, whereas smaller percentages could leave you under-reserved, and larger percentages would unnecessarily increase takeoff weight and fuel burn.