Handling changing transition altitudes in FMCs
How do FMCs handle variable transition altitudes, in parts of the world where the transition altitude changes a lot (from airport to airport or region to region)?
In the simulated FMCs I've seen, there's only one spot to enter a transition altitude, and there doesn't seem to be any provision for specifying other transition altitudes elsewhere on the route. And the FMC seems to "forget" the transition altitude and snap back to 18000 during the flight. Do real FMCs have more flexibility? How is it done?