amber EFOB msg in A320 ...

[ppppilot]

Hi. I believe that regulations points more into operational fuel planning than FMS calculations. As long as you land with the minimum fuel required you are ok on regulations, despite off what your fms says. Fuel pred page seems more a tool to me than a certificate. I base that on two questions. During preflight you make all your calculations with all the last minute data available. Winds aloft, performances tables, and operational factors that fms doesn’t know, such as it could be that ldg gear has to be down for the whole flight. After that, you must sign a paper copy as a legal probe that you are not a blockhead. That paper is the one you must show to the jury to defend why you landed over the whitehouse backyard. The second question is that it is not so unusual to see that msg in flight. i.e. A340, 11 hrs of flight and a distant alternate if you don’t introduce the step climbs or download the winds aloft the fms shows that msg, until it realizes that you are clever than him. You can also modify the crz lvl, and the tropopause to clear the msg. I believe that it is also possible change the crztemp in the A320.
Tailwinds