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Refer to figure.
During the pre-flight phase, the pilot of a helicopter decides to load 411 litres of fuel on each group of the standard fuel tanks and additionally 95 litres on the optional fuel tank. The moment of the Group 1 from the standard fuel tanks will be (1) _____, the moment of the Group 2 from the standard fuel tanks will be (2) _____ and the total fuel mass will be (3) _____.

  • A

    (1) 1009 m.kg; (2) 1466 m.kg; (3) 725 kg

  • B

    (1) 1245 m.kg; (2) 1855 m.kg; (3) 917 L

  • C

    (1) 1245 m.kg; (2) 1855 m.kg; (3) 725 kg

  • D

    (1) 1009 m.kg; (2) 1466 m.kg; (3) 917 L

Refer to figure.
The Standard-Fuel-Tanks configuration consists of two groups of tanks. Also, an Optional Fuel Tank may be loaded. Below the planview of each tank configuration a conversion table exists.

For the Standard-Fuel-Tanks configuration and the Optional Fuel Tank, the tables convert the fuel mass (kg) into fuel volume (l), avoiding any calculation with the specific gravity.

Also, the moment which corresponds to each fuel mass or volume for each group separately and the optional fuel tank is already calculated, avoiding any calculation again.

Using the conversion tables we get:

  • For 411 litres in Group 1, the corresponding moment (m.jg) is given as 1009 m.kg.
  • For 411 litres in Group 2, the corresponding moment (m.jg) is given as 1466 m.kg.
  • The conversion of the volume 95 litres into the corresponding mass in kg in the optional fuel tank is 75 kg.
  • The total fuel mass will be: 2 x 411 l + 95 l = 917 l or 2 x 325 kg + 75 kg = 725 kg.

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