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Calculate the remaining fuel overhead NADIR for the multi-engine aircraft, given:

Fuel on board at TROUT: 1 320 kg
Distance from TROUT to NADIR: 49 NM
True airspeed (TAS): 142 kt
Headwind (expected): 10 kt
Fuel flow: 440 kg/hr

  • A
    1 157 kg
  • B
    1 168 kg
  • C
    1 173 kg
  • D
    1 178 kg
(1) Determine the fuel consumption TROUT – NADIR:

Ground Speed (GS) = TAS – Headwind
Ground Speed (GS) = 142 kt – 10 kt = 132 kt

Flight time TROUT – NADIR = Distance / GS
Flight time TROUT – NADIR = (49 NM / 132 kt) x 60 = approx. 22.3 min

Fuel Consumption = (22.3 min x 440 kg/h) / 60 = 163.5 kg

(2) Calculate the remaining fuel at NADIR:
At TROUT, the remaining fuel onboard equals 1 320 kg.
From TROUT to NADIR, the fuel consumption equals approx. 163.5 kg.
Therefore, the fuel remaining at NADIR is:

  • 1 320 kg – 163.5 kg = 1 156.5 kg (approx. 1 157 kg)

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