can anyone tell my why the A-320 FMGS won't calculate step-climbs? While we
mostly operate quite short sectors (up to 3 hours), the FMS-computed optimum
level in the beginning usually differs from the one at the end. Still, when I
try to insert a step-climb, I get the message "no optimal". Why?
"no optimal" happens if the FMGS calculates that you cannot save any fuel by climbing to the new opt FL. i.e. too close to TOD.