Quetzalkoatl Posted October 22, 2020 Posted October 22, 2020 Hello Today I encountered a bug that looks like this: Under certain conditions like slow speed, high angle, thrust above idle and higher altitude F-16 tends to have FBW freezes that causes it to have elevator in constant down position, controlling via stick is impossible. Plane basically falls from the sky and nothing can be done about it. Increasing throttle to afterburner prevents it from crashing, but it remains in high alpha (still without ability to control it) When it's low enough somehow it manages to turn itself level enough to gain speed and wake up FBW system. Here are 2 track files. 1st is achieving that state by accident. Please keep in mind that I was afk for around 20 mins and didn't pause the game, so you may want to rewind it farther in time. F-16_FBW_freeze_bug_1.trk 2nd is trying to reproduce it on purpose (which is difficult and took several trials during this flight) F-16_FBW_freeze_bug_2.trk
F16FLCS-SME Posted October 22, 2020 Posted October 22, 2020 My friend I believe you got it wrong. What you described is the exact description of a deep stall and how the FLCS tries to recover from it. Did you use your MPO switch together with pitch rocking in sync with the up and down motion of the nose?
F16FLCS-SME Posted October 22, 2020 Posted October 22, 2020 BTW, according to your external view, your AOA reaches very high values. The range of motion of the AOA transmitters are 70 degrees. The AOA indicator can show -5 degrees. That means the upper limit is 70-5 which is 65 degrees. AFAIK it is even lower than 65 but I don't remember the value and can't prove it.
Quetzalkoatl Posted October 22, 2020 Author Posted October 22, 2020 It doesn't look like system wants to recover from it - in 2nd track i took control at 13:36 of the mission, left engine idle. Plane didn't recover from the stall and crashed. Tried the metod with MPO switch in another trial, also took control at 13:36 and managed to recover... at least that works. I have no info how it should work in real plane - it just looked strange in something as advanced as F-16C block 50. In best case scenario this thread will have [NOT A BUG] next to the title.
F16FLCS-SME Posted October 23, 2020 Posted October 23, 2020 Please read the following chapters in your -1: "OUT OF CONTROL RECOVERY" "HIGH PITCH, LOW AIRSPEED" "PITCH DEPARTURE" "DEEP STALL" "SPIN" "RECOVERIES" I think you should also read the relevant chapters about engine stalls.
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