For oil quantity planning, which factor determines the 301-399 range value that uses the highest of 10.6 qt or 9 qt + 0.5 qt per hour?

For oil quantity planning, which factor determines the 301-399 range value that uses the highest of 10.6 qt or 9 qt + 0.5 qt per hour?

• A. The estimated flight time in hours
• B. The engine count
• C. Outside air temperature
• D. Aircraft weight

Answer: (A)

Oil quantity planning uses a fixed minimum and a time-based burn, and you choose the higher of those two values. The fixed amount is 10.6 qt, while the time-based option is 9 qt plus 0.5 qt for every hour of flight. The factor that decides which value is used is how long the flight is—the estimated flight time in hours. You can find the break-even point by setting 9 + 0.5 × hours = 10.6. That gives hours = (10.6 − 9) / 0.5 = 3.2 hours. If the flight is shorter than about 3.2 hours, 10.6 qt is the larger amount; if longer, the 9 qt + 0.5 qt per hour becomes larger. So the estimated flight time in hours is the determining factor.

Oil quantity planning uses a fixed minimum and a time-based burn, and you choose the higher of those two values. The fixed amount is 10.6 qt, while the time-based option is 9 qt plus 0.5 qt for every hour of flight. The factor that decides which value is used is how long the flight is—the estimated flight time in hours.

You can find the break-even point by setting 9 + 0.5 × hours = 10.6. That gives hours = (10.6 − 9) / 0.5 = 3.2 hours. If the flight is shorter than about 3.2 hours, 10.6 qt is the larger amount; if longer, the 9 qt + 0.5 qt per hour becomes larger. So the estimated flight time in hours is the determining factor.