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Old 01-31-2010, 10:08 PM
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ULSK
New Hire
 
Joined APC: Jan 2010
Posts: 7
Default Flight Cost Index

Dear All

I have a question about using Cost Index in Airbus aircraft.

Cost Index = Cost of time/Cost of Fuel

As sper the above formula, if time cost (maintenance cost...) increases or fuel prices decreases CI goes up.
I work in the Airline Perfromace section and I advise pilots the optimum cost index (as per the above formula).

I know that pilots enter the cost index figure (optimum cost index given in the flight plan) to the FMGS before the departure.
I want to know if we (flt plan & pilots) use a Cost Index less than the optimum figure (CI-25 instead of CI-40) will it save more fuel than using the optimum cost index. (supposing the time difference is only 2-3 minutes).

And if an airline practices this for a long time is there any bad effects for the aeroplane performance.

Rgds/ULSK
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