Fuel calculation error in FP with extra fuel

Hello,

Looks like there is an error with the calculation of Fuel Flow for Extra fuel.
The two screenshots are for E190 and A320. In one Extra is heavier with less time than Final RES and in the other for the same weight, the time is shorter for extra.



Maybe something to look at :slight_smile:
Regards

Hi, this is normal.

FINRES time is calculated at holding fuel flow (basically maximum endurance). By comparison, EXTRA time is based on average fuel flow for the flight, which is a much higher fuel burn rate.

Likewise, ALTN is normally planned at Cost Index 0, so it too will often have a higher time vs fuel ratio when compared to the TRIP and EXTRA lines.

Best regards,

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