Calculate the Specific Air Range for TAS 320 kts and fuel burn 4000 kg/hr.

• A. 80 nm/tonne
• B. 128 nm/tonne
• C. 64 nm/tonne
• D. 160 nm/tonne

Answer: (A)

Specific Air Range tells you how far you can fly for each unit of fuel used. With a true airspeed of 320 knots, you cover 320 nautical miles in one hour. If fuel burn is 4000 kg per hour, that’s 4 tonnes per hour. So per tonne of fuel, you can fly 320 divided by 4, which equals 80 nautical miles. Therefore, the SAR is 80 nm per tonne. This assumes constant speed and fuel flow and ignores winds and reserves.