Calculate the Specific Air Range for TAS 240 kts and fuel burn 2400 kg/hr.

• A. 60 nm/tonne
• B. 80 nm/tonne
• C. 100 nm/tonne
• D. 120 nm/tonne

Answer: (C)

Specific Air Range tells you how far you can fly per unit of fuel. It’s usually expressed as nautical miles per tonne of fuel. To get it, divide the true airspeed (in knots) by the fuel burn (in kg per hour) to get nautical miles per kilogram, then multiply by 1000 to convert to nautical miles per tonne.

Here, with a true airspeed of 240 knots and fuel burn of 2400 kg/hr:

SAR = 240 / 2400 = 0.1 nm/kg; 0.1 × 1000 = 100 nm/tonne.

So the distance you can fly per tonne of fuel is 100 nautical miles.