PPRuNe Forums - Cost Index 737 in your Company.

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In our airline we use 30

Same here 30 for 737-300

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When you have a tailwind or the resulting arrival is too early for airfield slot for whatever reason, then you can reduce CI. Is that what you ask?

the RTA page is more likely to be used in this case , no?

Quote:

Originally Posted by arba

the RTA page is more likely to be used in this case , no?

- if you wish. Personal choice as always. I was merely trying to work out what the poster wanted in terms of CI.

Personally I have always just flown the a/c like wot we done before FMCs and not messed with RTA much, nor CI.

Good find, Douglas - on a quick look there is in fact a suggestion that the CI scale for an a/c type is fixed and it would appear that a given CI on a given type would produce the same speeds. However, as I stated earlier and abenk will see, the actual CI used its totally AIRLINE dependent and of little use to another operator (except in knowing who is going to delay you.:))

Quote:

the actual CI used its totally AIRLINE dependent and of little use to another operator

That's exactly what Boeing says:

CI is defined as time cost (~ $/hr) divided by Fuel cost (~ cents/lb)

Both are not fixed values but variable costs which means that they must be individual to different airlines as the CI must/should be...