Min oil quantity for range 301-399 is determined as:

Min oil quantity for range 301-399 is determined as:

• A. The highest of 10.6qt or 9qt + .5qt per every hour of estimated flight time
• B. 9.5qt + .5qt per every hour of estimated flight time
• C. 12qt
• D. 10qt

Answer: (A)

When calculating the minimum oil for this range, you use the higher of two quantities: a fixed 10.6 qt or a time-based requirement of 9 qt plus 0.5 qt for every hour of estimated flight time. This approach makes sure you have enough oil for longer flights even if the fixed amount isn’t sufficient. To apply it, compute 9 qt + 0.5 qt × estimated flight time (in hours), then compare that result to 10.6 qt and take whichever is larger. For example, with 2 hours of estimated flight time, the time-based need is 9 + 1 = 10 qt, so the minimum is 10.6 qt. With 4 hours, it’s 9 + 2 = 11 qt, so the minimum is 11 qt. The option that uses a fixed 12 qt or 10 qt or the base 9.5 qt with the time factor doesn’t follow this rule.

When calculating the minimum oil for this range, you use the higher of two quantities: a fixed 10.6 qt or a time-based requirement of 9 qt plus 0.5 qt for every hour of estimated flight time. This approach makes sure you have enough oil for longer flights even if the fixed amount isn’t sufficient.

To apply it, compute 9 qt + 0.5 qt × estimated flight time (in hours), then compare that result to 10.6 qt and take whichever is larger.

For example, with 2 hours of estimated flight time, the time-based need is 9 + 1 = 10 qt, so the minimum is 10.6 qt. With 4 hours, it’s 9 + 2 = 11 qt, so the minimum is 11 qt. The option that uses a fixed 12 qt or 10 qt or the base 9.5 qt with the time factor doesn’t follow this rule.