§ 17
Is the difference between the tanker truck's litres and the plane's metres within tolerance?
Answer: After refuelling, two numbers are compared. The aircraft's gauges show how many kg has gone into the tanks: fuel after minus fuel before. The tanker or dispenser shows how many litres were delivered, and litres times the delivery density gives kg. If the difference is greater than the operator's tolerance, there may be an error in the gauge, a wrong density, a typo or in the worst case a leak, and it must be reported before the aircraft flies. The tolerance is the operator's own. Many use 2-3%. The calculator works out the difference from your own numbers.
Uplift ifølge flyet = brændstof efter − brændstof før (kg, flyets målere)
Uplift ifølge tankbilen = tanket liter × massefylde (kg)
Afvigelse = (tankbilens kg − flyets kg) ÷ flyets kg × 100
Eksempel: 9.200 L × 0,800 = 7.360 kg. Flyet viser 9.800 − 2.400 = 7.400 kg. Afvigelsen er −0,5 %
| Symbol | Meaning | Unit |
|---|---|---|
| foer_kg | Fuel on board before refuelling (aircraft's gauges) | kg |
| efter_kg | Fuel on board after refuelling (aircraft's gauges) | kg |
| liter | Tank volume (tanker meter) | L |
| sg | Density from the supplier | kg/L |
| tolerance_pct | Tolerance (operator's procedure) | % |
| = | Deviation between gauges and tanker | % |
| = | Uplift according to aircraft instruments | kg |
| = | Uplift according to the tanker (litres × density) | kg |
| = | Difference | kg |
| = | Margin til tolerancen (negativ = over) | procentpoint |
Does not apply when
The calculator's own default values inserted. The figures are calculated with exactly the formula the tool uses.
Substituted
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Du bruger den efter hver tankning, når tankbilens liter skal sammenholdes med det, flyets målere viser. En stor forskel kan betyde en målefejl, en forkert massefylde eller en lækage.
Flyet havde 2.400 kg og har nu 9.800 kg. Tankbilen viser 9.200 liter ved 0,800 kg/L. Tolerancen er 3 %.
It means: Flyet viser 7,400 kg, og tankbilen 7,360 kg. Forskellen er -40 kg, altså -0.5 %. Margin til tolerancen er 2.5 percentage points.
Flyet havde 3.100 kg og har nu 12.500 kg. Tankbilen viser 12.400 liter ved 0,795 kg/L.
It means: Flyet viser 9,400 kg, men tankbilen 9,858 kg. Afvigelsen er 4.9 %, og margin er -1.9 percentage points. Meld det til kaptajnen, før flyet går.
1 % af 7.000 kg er 70 kg.
Tankbilens kg minus flyets kg skal give forskellen.