So I’ve been frequently having this issue with the autopilot in Infinite Flight. When slowing down to my final approach speed, the autopilot suddenly fails to maintain the given speed and altitude setting and overcorrects way too much leading to a sort of “bobbing”.
For example, yesterday I was doing a flight with the new A350. However when setting full landing flaps and a speed of 140KTS (Which I usually opt for as my final approach speed for airliners in IF as I don’t have an exact vref speed) and an altitude of 3000ft to set myself up for final approach, the speed would frequently fall below 140KTS leading the autopilot to over correct by applying near full throttle. The over correction caused the aircraft to pitch up drastically and accelerate to way above 140KTS. Once this over correction is complete, the autopilot tries to correct the new incorrect altitude and speed but fails to do so. It lowers the throttle and lowers the pitch but then lets the speed fall below 140KTS and the same over correction occurs again.
I don’t know what I’m doing wrong here so if anybody can help me with this I would appreciate it a lot.