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danparker86 replied the topic: Re: Exam questions
I really appreciate the help you've all given me!
Another query I have regarding fuel, let's say for example I was trying to find the fuel available for a flight, from what I understand you would take the total flight fuel in tanks then subtract the reserve and taxi and holding fuel then divide by 1.15 to get the reserve.
Why is it that when finding the fuel required I follow a system like this
The variable reserve applies only to the actual flight fuel and the fuel to the alternate [if required]. You do not apply the 15% variable reserve to the holding, fixed reserve or taxi fuel. Therefore to find the total fuel required you do this:
Fuel required = flight fuel + alternate fuel [if required] x 1.15. That looks after the variable reserve. Then add the fixed reserve, holding [if required] and taxi.
To go the other way and find the flight fuel available you do this:
Flight fuel available = Total fuel at start-up - taxi - fixed reserve - holding. That takes care of everything except the variable reserve. So you then divide the remainder by 1.15 and that removes the variable reserve leaving the flight fuel available.
In your worked example you are including the holding fuel as thought it was flight fuel. That is not correct.