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Dear friends and followers, welcome back to my channel, today´s question is another very important one, especially if you are wanting to become an airline pilot, you´ll be dealing with this topic a lot.
What is a cost index and how does it influence the planes´ performance. I´ll go over some basic details on what defines the cost index, like flight operational costs, what they are made of and how they have an impact on daily flight operations. Another very big part of the cost index calculation is the current fuel price. As fuel is the denominator in the division, it has the bigger impact on changing the value of the cost index.
So I´ll show you an example on how to perform such a cost index calculation.
You can say, the cheaper the fuel the higher the cost index, the faster the plane will fly, the shorter the flight time.
The more expensive the fuel, the smaller the cost index becomes and the slower the aircraft will fly to become more economically efficient.
Next then will be to look at on how the cost index affects the planes´ flight profile.
KEY NOTE:
LOWEST COST INDEX and the aircraft will fly at maximum range cruise but relatively slow.
HIGHEST COST INDEX and the aircraft will fly at maximum cruising speed giving you the shortest flight time at the highest fuel burn.

The cost index value ranges from 0 999 and has to be typed in the FMS ( Flight management system ) via the MCDU ( Multi Control Display Unit ) on the Airbus.

I hope I was able to explain this topic as simple as possible, cause this for sure is a difficult topic.

Thanks for watching, all the best your "Captain" Joe

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