A vs B econ speeds
 

hello,
Does anyone has an idea if the econ speeds for a certain cost index are the same?
like 737 vs 320 at the same cost index, do they fly the same speed?

No, they do not produce the same speed, it might be in the same ballpark though.

For example we use CI 10 on our 737s and CI 7 on our A320 family. Even on the airbus fleet it doesn't produce the same speed though, depending on FMCG manufacturer it will give a 250kts or 270 kts descent speed for example, while CI 10 on the boeing will produce a 250kts descent. Climb and cruise speeds are a completely different problem altogether.

I would suggest checking out Boeings and Airbus information on the subject.

I think the Boeing is stuck with 250kts (or 240kts) leftover from the checkride internal default.

That's just below 10000' or FL100. Above that the descent speed is a fix number depending on cost index.

thank you Denti, that all i needed to know