The cost index, somewhere in the FMC screen menu on a 757 can be changed from 55, to whatever, but I don't remember what this does to the climb or cruise speeds etc and the top of descent point or circle on the HSI's pink (magenta for the linguistically correct) line .
Only one pilot changed the index then a short while later, changed it back to 55.
Last edited by Ignition Override; 26th October 2006 at 17:53.