[BUG] - Stall protection system not doing as intended

[CptUnicorn]

Describe the bug

I stepped away for a few minutes to tend to my dogs needs and when I came back I was in a nose dive. I looked back at the footage on my recording software and it appears the aircraft stalled. Unfortunately my software only records the last 2 minutes so I am not sure what caused the aircraft to get so slow so quickly. But as you can see, the aircraft is at a dangerously slow speed as the aircraft begins to oculate left and right eventually leading to a wing stalling and entering what looked like a fully developed flat spin.

Steps to reproduce

Enter a stall at altitude with autopilot engaged.

Expected behaviour

I hope to see the stall prevention system kick in.

Evidence

https://medal.tv/games/microsoft-flight-simulator/clips/1F5NWd3zc-tbya/d1337lsxw27E?invite=cr-MSx6cWksMTkzNzg2ODc5LA

Simulator

Microsoft Flight Simulator 2020 (MSFS)

Crash

No

Phase of flight

Cruise

Pitch

5 degrees

Bank

0

Heading

N/A

Altitude

FL360

Departure

EHAM

Arrival

CYVR

Cruise level

FL360

ZFW

155.7

CG

25.6

Fuel

N/A

Cost index

200

Route

EHAM/09 N0487F340 BERG3N BERGI DCT ROKAN DCT NAVEL DCT DENOG DCT KESEG/M084F340 DCT 6210N DCT 6620N DCT 68N027W DCT 7040N DCT 7160N DCT NADMA/N0473F340 DCT 71N070W DCT 7078N DCT 68N090W 66N098W 64N104W DCT YSM J528 YQU DCT BOOTH LIONN2 CYVR/08L

Location

Over Northern mainland Canada near Igloolik

Agreement

• [X] Yes

[JeffRichard1958]

I'm not a developer. Just a tester. I tried doing a stall series and I do not believe that the stall logic is implemented. Other than amber A/S at the foot Vss and red airspeed at Vs, I never got the stick nudge approaching Vss nor the autoslats at Vss. I was watching your video, and that was some weird stuff. 94 percent power and it was behaving as though all three engines had flamed out. I'm not sure what a stick nudge would do for that BUG,as you were letting the dog out. The autoslats never deployed, but I don't think that would have helped. Definitely a BUG. Weird one. I have not seen that happen before.

[CptUnicorn]

I'm not a developer. Just a tester. I tried doing a stall series and I do not believe that the stall logic is implemented. Other than amber A/S at the foot Vss and red airspeed at Vs, I never got the stick nudge approaching Vss nor the autoslats at Vss. I was watching your video, and that was some weird stuff. 94 percent power and it was behaving as though all three engines had flamed out. I'm not sure what a stick nudge would do for that BUG,as you were letting the dog out. The autoslats never deployed, but I don't think that would have helped. Definitely a BUG. Weird one. I have not seen that happen before.

That manual page was a great read!

It was really weird. I genuinely thought I bumped my joystick setting my headset down until I watched the footage. I remember during my early stages of flight training my instructor told me to never use alerion when in a stall because it could exacerbate the stall. There is so much alerion movement in the video lol. If I had been maybe 30 seconds earlier I probably could have saved the plane, but it is what it is.

[JeffRichard1958]

It reminds me of the Air France crash:

https://www.youtube.com/watch?v=8lBUf4HbIa8

They got into a high altitude stall. As a result, we, as airline pilots, have had to practice high altitude stalls with a swept wing transport. You basically sit there sinking at full power and never get the classic buffet and snap roll off. They needed to unload the aircraft and get the nose down. Instead they kept pulling back and sinking at an ever increasing rate.

On Nov 22, 2023, at 8:59 AM, CptUnicorn @.***> wrote:

I'm not a developer. Just a tester. I tried doing a stall series and I do not believe that the stall logic is implemented. Other than amber A/S at the foot Vss and red airspeed at Vs, I never got the stick nudge approaching Vss nor the autoslats at Vss. I was watching your video, and that was some weird stuff. 94 percent power and it was behaving as though all three engines had flamed out. I'm not sure what a stick nudge would do for that BUG,as you were letting the dog out. The autoslats never deployed, but I don't think that would have helped. Definitely a BUG. Weird one. I have not seen that happen before.

https://user-images.githubusercontent.com/148719444/284901685-96931fe1-80c9-477c-b8ac-abcb1f2efdf4.jpg That manual page was a great read!

It was really weird. I genuinely thought I bumped my joystick setting my headset down until I watched the footage. I remember during my early stages of flight training my instructor told me to never use alerion when in a stall because it could exacerbate the stall. There is so much alerion movement in the video lol. If I had been maybe 30 seconds earlier I probably could have saved the plane, but it is what it is.

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[FreakyD777]

I already wrote up two PRs on stall indication and performance. See #279 and #267