C208: Sudden stall in AP (FL159), ASI not working

ISSUE DESCRIPTION

Description of the issue:
Sudden stall while on AP in FL159 through “rough” weather condition (flying through clouds, outside temp below freezing, de-icing on), simrate x16, ASI (3rd person) “frozen” on 120 kts, AP is trimming on +90%.

Deceased SR to x1, switched AP off, ASI still “frozen”, reset trimming to +/-0%, when trying to recover from stall (nose down 10°, full throttle), over speeding warning (ASI still frozen in 120 kts), resulting in “mission failed” screen (destroyed aircraft).

I was flying career mode medium cargo mission (location code not memorized, somewhere northern England to southwestern France) with C208 cargo version, mission specific cargo weight, sufficient fuel loaded and still in tanks when the incident happened.

Note: The C208 is described in-game as having a ceiling height of FL250 (also, reaching FL200 results in “hypoxia” mission failure - similiar to PC12/24).

[PC Only] Did you remove all your community mods/add-ons? If yes, are you still experiencing the issue?
No mods - xcloud/game pass

FREQUENCY OF ISSUE

How often does this occur for you (Example: Just once, every time on sim load, intermittently)?
Once (career mission fail)

REPRODUCTION STEPS

Please list clear steps you took in order to help our test team reproduce the same issue:

  1. C208 medium cargo career mode (3h flight)
  2. sufficient fuel for flight (approx. 600lb left)
  3. Climb to FL159 (ATC-IFR order)
  4. Activated de-icing (toggle left green trigger)
  5. Overcast weather (incl. stratocumulus clouds)
  6. Activate AP (NAV/GPS, VNAV [no TOD for next WP], ALT, YD)
  7. Switch to 3rd person view
  8. Increase simrate (2-16x)
  9. Decrease simrate (1x)
  10. Disable AP
  11. Monitor ASI (TAS)

YOUR SETTINGS

If the issue still occurs with no mods and add-ons, please continue to report your issue. If not, please move this post to the User Support Hub.

What peripherals are you using, if relevant:
Keyboard, Mouse, Game Controller

[PC Only] Are you using Developer Mode or have you made any changes to it?
No.

[PC, MSFS 2020 Only] Are you using DX11 or DX12?
-/-

[PC Only] What GPU (Graphics Card) do you use?
nvidia GeForce 4080i (GeForceNow Ultimate)

[PC Only] What other relevant PC specs can you share?
GFN server running Win11 with Xbox PC Game Pass (Ping 12ms, FPS: 60 stream/120 game [DLSS, max. graphics settings])

MEDIA

Please add a screenshot or video of the issue occurring.
No screenshots available.

[END OF FIRST USER REPORT]


:loudspeaker: For anyone who wants to contribute on this issue, Click on the button below to use this template:

Do you have the same issue if you follow the OP’s steps to reproduce it?

Provide extra information to complete the original description of the issue:

If relevant, provide additional screenshots/video:

Pitot heat on? Sounds like frozen pitot giving false ASI readings. Exactly as would happen IRL.

1 Like

I’m sure, I flipped on all of the three far left green switches (picture snippet taken from a physical C208B training device).

Anyhow, anything over FL100 is a drag to climb with the C208. I’ll try it out later with a employee mission (I’m not risking my own plane for this again).