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Different takeoff performance results when changing OIS weight units

ljk811
in Systems

Featured Replies

Hi,

I found a reproducible issue with the Takeoff Performance calculator.

Using the exact same aircraft, airport, runway and weather, simply changing the OIS weight unit from Tonnes to x1000 lbs results in different takeoff performance calculations.

The aircraft weight is identical:

  • 273.1 t = 602.1 x1000 lbs

However, the calculated V-speeds are different:

Tonnes

  • V1 149

  • VR 152

  • V2 161

  • TOGA

x1000 lbs

  • V1 137

  • VR 140

  • V2 146

  • FLEX 67°C

Changing the weight unit should only affect the display, not the performance calculation.

I've attached screenshots showing both results.

1eb0d2639b6b6e600e27a7b54e17c5d7.pnge43a0bd28a1918e892908633d04bddb3.png

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