A helicopter flying above a mountainous area encounters an engine failure. To maintain the required terrain separation, the Pilot decides to jettison 685 kg of fuel. How many litres should be jettisoned, if the specific gravity is 0.78?
A relationship exists between litres and kilograms:
- 1 litre of water weighs, 1 kilogram.
A similar relationship exists between pounds and imperial gallons (IG):
- 1 IG of water, weighs 10 pounds.
To convert from volumes to mass or mass to volumes, you need the Specific Gravity of the fuel:
- The Specific Gravity (SG) shows the relationship between litres and kilograms or between pounds and imperial gallons.
Specific Gravity 0.78 means that a volume of fuel weighs 78% of the equivalent volume of water.
Thus, 685 kg of fuel has a fuel volume of: 685 kg / 0.78 = 878.2 litres.
NOTES:
1. Fuel volume is measured in: Imperial Gallons (IG), US Gallons (USG) or litres (l or lt).
2. Fuel mass is measured in:, tonnes (t or ton), kilograms (kg) or pounds (lb).
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