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For a planned flight the calculated fuel is as listed below. How much fuel should be aboard, if the remaining flight time to destination is 1 hour 50 minutes?

Trip Fuel: sufficient for a planned flight time of 5 hours 10 minutes
Operator’s specified Reserve Fuel: 30% of the planned Trip Fuel
Start up and Taxi Fuel: 25 kg
Block Fuel: 645 kg

  • A
    220 kg
  • B
    337 kg
  • C
    169 kg
  • D
    312 kg

For this category of questions, proceed with the following manner:

1. Take-off fuel = Trip fuel + 30% Trip fuel = 130% Trip fuel or Take-off fuel = 1.3 x Trip fuel.

2. Also, Take-off fuel = Block fuel - Start-up & Taxi fuel = 645 kg - 25 kg = 620 kg.

3. Thus, we get the following equation: 1.3 x Trip fuel = 620 kg.

4. Solving for Trip fuel, we get: Trip fuel = 620 kg / 1.3 = 477 kg.

5. So, the Trip fuel flow is: Trip fuel / Trip time = 477 kg / 5.17 hr = 92.3 kg/hr.

6. The Trip time from take-off to the current position is: 5.17 hr - 1.83 hr (or 05:10 - 01:50) = 3.34 hr (or 03:20).

7. After 3.34 hr, the Trip fuel used will be: 92.3 kg/hr x 3.34 hr = 308.3 kg.

8. Therefore, the fuel remaining after 3.34 hr will be: Take-off fuel - Trip fuel used = 620 kg - 308.3 kg = 311.7 kg, closest answer 313 kg.

NOTE:
The question asks for the remaining fuel amount after a flight of: 05:10 - 01:50 = 03:20.

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This question has appeared on the real examination, you can find the related countries below.

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