Refer to figures.
Assuming the following data:
Ground distance to be covered: 1500 NM
Cruise flight level: FL310
Cruising speed: Mach 0.82
True airspeed: 470 kt
Head wind component: 40 kt
Planned destination landing mass: 140 000 kg
Temperature: ISA + 15°C
CG: 37%
Total anti ice: ON
Pack flow: HI
Fuel consumption for such a flight is…
Refer to figures.
NAM = NM x TAS / GS
NAM = 1500 x 470 / 430 = 1640 NAM
Open the attachment and extrapolate between 1600 NM and 1700 NM to get the fuel consumption:
Fuel consumption for 1640 NM = 21 461 kg
ISA deviation correction = 0.01 x 15° x 1640 = 246 kg
21 461 kg + 246 kg = 21 707 kg
Apply fuel corrections:
Total Anti Ice On correction = 0.07 x 21 707 = 1520 kg
Pack flow HI correction: 21 707 kg x 1% = 217 kg
Total fuel Consumption after corrections = 21 707 + 1520 + 217 = 23 444 kg
Closest Answer = 23 500 kg
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