Matthias Markus 7 Posted January 23, 2019 Share Posted January 23, 2019 When starting the aeroplane there is shown a groundtemperature on MCDU Init Page 1, that is not the real one outside. So you have to set the real groundtemperatur by yourself. Is that as in real Airbusses or should that be changed? Link to comment Share on other sites More sharing options...
DaveCT2003 2553 Posted January 23, 2019 Share Posted January 23, 2019 4 hours ago, ABFan said: When starting the aeroplane there is shown a groundtemperature on MCDU Init Page 1, that is not the real one outside. So you have to set the real groundtemperatur by yourself. Is that as in real Airbusses or should that be changed? Here is a definition of the Ground Temp entry: Ground temperature is normally entered during preflight. In flight the ground temperature defaults to a blank display (3 dash lines). But (and it's a HUGE "But"), neither FMGS type for the Airbus's are perfect, especially when it comes to temps and cruise levels. Though in a strange way, I actually have some direct experience with just these sort of calculations. Basically, the calculations for temps, economic speeds and cruise levels and Tropopause are not only extremely complex, but the FMGS calculations can also be wrong with certain "correct" inputs. For this reason, Airbus has recommended NOT changing the internally calculated Ground Temp or Tropopause figures. CAVEAT: If you Google this, you'll find a slew of sites/PDF/training documents that say for GND Temp you should enter the Ground Temp as it will be at Takeoff. But again, Airbus engineers said NOT to do this and that appears to be the latest information on this. Put another way, the values that auto-populate exist to mitigate the inaccuracies in the calculations. So, we recommend that you leave both the above entries alone. If you decide to change them (hey, it's your aircraft!) then please don't report any bugs seen during flights where this info was changed. I hope this answers your question! Best wishes. Link to comment Share on other sites More sharing options...
Deputy Sheriffs masterhawk 799 Posted January 23, 2019 Deputy Sheriffs Share Posted January 23, 2019 Yep, today I was told by one of our test pilots, that this value IRL should be left at default if you use weather uplink. Please login to display this image. Link to comment Share on other sites More sharing options...
Deputy Sheriffs Herman 1591 Posted January 23, 2019 Deputy Sheriffs Share Posted January 23, 2019 This is unrelated to the 3rd/Settings MCDU, so I moved it to the "standard" MCDU thread. Link to comment Share on other sites More sharing options...
Matthias Markus 7 Posted January 24, 2019 Author Share Posted January 24, 2019 Thanks for your excellent answers! I am very satisfied in learning something new! Link to comment Share on other sites More sharing options...
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