Discussion
Assertion (A): Turbine engine fuel flow is displayed as mass per hour.
Reason (R): The energy available from fuel depends on its mass rather than its volume.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is exactly why mass is used. The heat released per kilogram of fuel is essentially constant, while the mass in a given volume falls as the fuel warms, so a volumetric indication would mean different things at different fuel temperatures.
Indicating mass per hour removes the dependence entirely and makes fuel used directly comparable with the fuel loaded, which is weighed. That comparability matters in flight: a growing discrepancy between fuel used and tank contents is a standard leak indication.
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