Hi, you should just double press the key, corresponding to parameter you want to enter and it will fill the empty space for you.
Most of the aircraft are configured to be just below Max Landing weight (MLW)
You have probably been messing around with the INIT-B page. You can double click each weight field to get the correct zero fuel weight and block fuel.
Gross weight and fuel burn is frozen in this sim (similar to if you are practicing circuits in a full motion sim)
The A320 weights in the sim -
zero fuel weight = 52.3T
Fuel = 7.7T
Gross weight 60T
Like in the real world entering the weights into the MCDU does not actually change the mass of the plane but the computers then use your values to compute the approach speed and other performance data. So if the approach speed is off then it might just be a wrong value entered into the weight.
As mentioned by users you can fill in the correct data im Aerofly FS by using a "double click" on the line select key next to it.
Entering wrong data has actually caused several real world accidents in the past. For example if the airplane is told that it's lighter than it actually is, then you loose your protections and safety margins against stalls and you can easily cause a tail strike on takeoff. And if the inserted weight is too high then the aircraft might lift off too soon, accelerate too quickly which can cause flap overspeed to be reached or float forever on landing, potentially risking a nose gear contact or bounced landings.
And yes the sim already simulates the mass of the aircraft as well as the effects of entering incorrect weights...
As mentioned by users you can fill in the correct data im Aerofly FS by using a "double click" on the line select key next to it.
Interesting, which values can be double clicked like that?
