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14th Feb 2023, 22:09

#17 (permalink)

k.swiss

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Quote:

Originally Posted by vilas

Since penalty factor of 180% is huge so the calculation is creating some confusion. Let's take FOB 6000kgs and EFOB 4000kgs. That gives burnoff of 2000kgs. Take a penalty factor of say 15%. When applied to 2000kgs will give 300kgs. Surely that can't be the BO with failure but only additional fuel required. It will be added to normal burnoff of 2000kgs giving the figure off 2300kgs as the trip fuel with failure. So the new EFOB with FPF will be
6000-2300=3700kgs.This should make it clear.

Thanks vilas
First question, is the penalty not also applied to alternate/final reserve fuel incase of GA?
Second, to summarize if at any point the EFOB (with penalty) goes below the actual EFOB on the MCDU then we can not continue and better to divert as fuel will not be enough given the penalty?

Quote:

Originally Posted by FlightDetent

[penalty +30%] >>> FMS burn (100%) + 30% = 130% = 1.3 x FMS
[penalty +180%] >>> FMS burn (100%) + 180% = 280% = 2.8 x FMS

Don't forget the additional +15% for doors ajar in case of gravity extension.

Thanks FlightDetent

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