Concerning the FMS, the cost index is computed by dividing…
The Cost Index is used to adapt the flight path of the aircraft for a given leg by finding a compromise between the fuel cost and the operating cost. It is computed as follows:
| Aircraft operating cost ÷ Fuel cost |
Low CI (zero) – maximum range speed, resulting in minimum trip fuel.
High CI – high airspeed, resulting in high fuel consumption.
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