How does the Airbus use the tropopause value?
Hi,
On a long dark night recently, our crew was experimenting with changing the tropopause entry on the INIT page, and checking the resultant change in optimal step altitudes. After searching our companies FCOM, there was very limited information on how this tropopause value is used, but it seems the value does indeed change FM predictions.
Do Airbus or other operators recommend changing this value during the cruise? (Our particular flight was MEL-HKG, so our departure port had a forecast tropopause of 35,000, and 9 hours later in HKG it was approx 55,000')
Thanks!
Jason