Originally Posted by
JammedStab
I have noticed that usually the RCMD changes to a higher altitude prior to the actual green S/C point on the ND. Does anyone know why.
That's probably because there are subtle but important differences between how the FMC massages the numbers to come up with the S/C point verses RCMD alt figures. It would be interesting to see if you hit the green step point as the step distance reduces to zero........
There are documents around explaining this in detail but I'm wary of going any further 'cos I might be drifting into company/Boeing proprietary stuff - As perhaps you can see from the links I gave a couple of posts back Boeing have been doing a lot of work with operators regarding FMC use and bespoke (and paid for) provision of wind data.