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Hello, I was searching in support for anyone else who spoke about this but didn’t seem to find it. But when I engaged autopilot speed for the A220 climb and cruise, it always seem to me stuck one Mach behind the one where I want it to be. Is this something wrong that need to be fixed? Or is this just how A220s fly? But I remember when I first flew it when it got released, it didn’t have this problem.
Device: iPad 6th Generation Operating system: iPad OS 17.7.5
Naur, not normal, autopilot is smart enough to adjust with wind and weight. I know the conditions that I’m flying in if it’s something to do with weight and wind I wouldn’t be making this post I’m not that intellectually challenged
No, I’m serious, sometimes it says slightly below your target most of the flight lol. In that case, you sort answered yourself though right? Maybe you climbed too fast for your weight and lost a lot of air speed.
the difference between .77 and .78 is only a couple of knots, which is a perfectly normal deviation for ap. just know that IF’s ap is not at all at the level of irl ap systems.
It’s really not. If you select a speed for the aircraft to hold, it will maintain that speed. The A220 in IF is always slacking behind during climb and cruise, regardless of weight or altitude. As you can see in the picture, it’s not maintaining that speed. If it were too heavy or too high, the power setting would be greater than what is shown
Look up steady-state error in the control theory. This is definitely a known behavior of a closed loop system. This can be eliminated by adding an integrator to the control law.
THANK YOU! EVERY TIME I ASK SUPPORT SOMETHING THEY JUST SAY ITS MY FAULT FOR MAKING THE PLANE HEAVY WHICH IT LITERALLY ISNT. Finally someone said it thank you nobody gets me😭
Yes, at 38000ft, you IAS should be 246,6kt to reach M0,78, and that is were the blue mark is on the IAS scale, but the speeds of the A220 never quite reach the cruise speed set and always remain about 0,1 mach below.
The conversion tool below is usefull I think.
Thats not the right way tbh. Usually if AP indicates 0.77 when you have selected 0.78, it is actually flying at 0.778-0.779 I believe. So in your case you’d actually be cruising at 0.789.
