I tried to find the definition of these fuels but I could't.
Does anyone know about company compensation fuel or pad fuel? In which document can I find the definition of these fuels?
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This is a term, which seems to be used by Korean Air. They define it on their website:
▶ Company Compensation Fuel
fuel to minimize abnormal flight occurred. Based on this, fuel consumption performance is modeled for a certain period of time, and based on this, the amount of fuel repeatedly consumed excessively compared to the flight plan is added.
(koreanair.com, translated by Google)
So this is fuel added based on the airline's experience (hence company) for typical fuel use on a given route.
I have never heard this term and Google also does not find anything related to aviation. Is it possible this was a translation? If so, could you add the original term and where you heard about it?
I suspect the "pad fuel" might refer to conditions where deicing is needed. Time spent on deice pad with engines running leads more fuel consuption than a normal taxi to holding point would.
Since this is an easily indentifiable situation with predictable effect on fuel consumption, it might be that this would be referred to as "Pad fuel".
But: as google comes up with absolutely nothing, I highly doubt my own answer.
PAD fuel is company specific and typically applies to an abnormal event taking place at or near a predefined point; e.g., ETP during ETOPS.
For example: If a depressurization event were to occur and a subsequent decent commenced, PAD fuel would be that in excess of minimum GO/RETURN fuel to reach facilities named on either side of an ETP under reduced efficiency.
It’s just another dispatch contingency similar to the aforementioned compensation fuel and is used in the same colloquial context as if supplementing or “padding” one’s bank account.