Air Speed Unstable / Displays Glitch

[t]

Hi,

I had an issue today that I couldn't explain. While either ascending or descending, the speed readout on my PFD was wrong (and it was jumping up and down). The ESIS showed the same behavior, even when at level flight. The speeds of the ESIS and the PFD did not match up after takeoff.

I also had some weird glitch text in the MFD, that I don't think I ever observed before SP1. I just upgraded this weekend, and hadn't seen these before.

I've attached a few screen shots showing the issue:

speed_diff.jpg (452.71 KiB) Viewed 1919 times

speed_diff.jpg: this is showing the speed difference between the ESIS and the PFD. The ESIS was also jumping between 198 and 208 very sporadically. When taking this screenshot the PFD was stable. Excuse the state of the ESIS, I naively power cycled it wondering if that would resolve it (when at cruise).

glitchy_jumpy_speed.jpg (443.26 KiB) Viewed 1919 times

glitchy_jumpy_speed.jpg: This is showing the glitchy text on the MFD and PFD, as well as the speed still not lining up. I could no longer switch to LOC1 on the PFD to execute an ILS approach. I also noticed that the speed on the PFD was about 20 knots under my true IAS when it was glitching/jumping around. When it was stable it would suddenly jump up by about 20 knots.

To clarify, the speed was wrong and glitchy on the ESIS for the entire flight. The speed was wrong and glitchy on the PFD, only when the plane was either ascending, descending, or adjusting for turbulent air. When I was at cruise, and the flight was smooth, the PFD looked correct.

Has anyone seen this before, and have any idea what caused it? This is the second or third flight since installing the SP1 update, and so I was a bit surprised. Thankfully I landed with no issues, but it was a bit unsettling coming in without a way to know my actual speed.

[henrik.bergvin]

To me it looks like you didn't wait for the ESIS to finish it's boot up, it takes a few minutes.



It's not entirely lined up in my screenshot, but should be close enough.

As for the text, take a look here:
http://www.milviz.com/forum/viewtopic.php?f=105&t=12243

[Taguilo]

Hi,

I had an issue today that I couldn't explain. While either ascending or descending, the speed readout on my PFD was wrong (and it was jumping up and down). The ESIS showed the same behavior, even when at level flight. The speeds of the ESIS and the PFD did not match up after takeoff.

I also had some weird glitch text in the MFD, that I don't think I ever observed before SP1. I just upgraded this weekend, and hadn't seen these before.

Hi,

First point, remember to remove your pitot covers on the ground, before departure.

Second, please install latest beta (.30) from this support forum, top thread.

Thanks!

Tomas

[t]

Hi,

I had an issue today that I couldn't explain. While either ascending or descending, the speed readout on my PFD was wrong (and it was jumping up and down). The ESIS showed the same behavior, even when at level flight. The speeds of the ESIS and the PFD did not match up after takeoff.

I also had some weird glitch text in the MFD, that I don't think I ever observed before SP1. I just upgraded this weekend, and hadn't seen these before.

Hi,

First point, remember to remove your pitot covers on the ground, before departure.

Second, please install latest beta (.30) from this support forum, top thread.

Thanks!

Tomas

Hm, I didn't see any pitot covers on when I was setting the plane up. Is it possible they weren't rendering while on the ground? I do a visual inspection before I start the engine to make sure everything is removed (including the chocks).

I'll update to .30 next time I'm on my rig.

[t]

To me it looks like you didn't wait for the ESIS to finish it's boot up, it takes a few minutes.



It's not entirely lined up in my screenshot, but should be close enough.

As for the text, take a look here:
http://www.milviz.com/forum/viewtopic.php?f=105&t=12243

As I said in my post:

Excuse the state of the ESIS, I naively power cycled it wondering if that would resolve it (when at cruise).

Also the fonts weren't squished, or misbehaving until the end of my flight. Everything was fine until I was about ready to switch to LOC1. That's when the PFD and MFD had glitched out. If the fonts were the issue, I'd have expected that starting on the ground at my departing airport.

[Slayer]

I've seen the airspeed jump like that a few times using active sky and I've also seen it damage my engines sometimes in rough weather. I couldn't explain the behavior except that closing AS smoothed everything back out again.

Edit: I think there are smoothing options in AS , those may help but I haven't tinkered that much as it occurs so infrequently.

[CS-TMT]

After a couple of short test flights, today I did a bigger "normal operation" flight from my home airport Lisbon to the famous challenging Madeira Airport as I wanted to test my recently purchased Real Turb pack (ended up with a uneventful landing as there was no wind at all in Funchal ).
However on departure from Lisbon as well as during descent to Funchal, as there was a lot of turbulence, the airspeed tape was going completely crazy jumping +/-20kt, both on the PFD as well as on ESIS (remember how FS2002 and older modeled turbulence behaviour on the airspeed indicators? That's how this was acting, although the airplane was not bouncing that crazily and I was perfectly capable of using FLC with a set speed. After crossing the turbulent layer, the airspeed on the PFD went calm for the whole cruise, as well as on the approach and landing. However the airspeed on ESIS kept jumping for the whole flight - even in cruise with no turbulence.

[Slayer]

After a couple of short test flights, today I did a bigger "normal operation" flight from my home airport Lisbon to the famous challenging Madeira Airport as I wanted to test my recently purchased Real Turb pack (ended up with a uneventful landing as there was no wind at all in Funchal ).
However on departure from Lisbon as well as during descent to Funchal, as there was a lot of turbulence, the airspeed tape was going completely crazy jumping +/-20kt, both on the PFD as well as on ESIS (remember how FS2002 and older modeled turbulence behaviour on the airspeed indicators? That's how this was acting, although the airplane was not bouncing that crazily and I was perfectly capable of using FLC with a set speed. After crossing the turbulent layer, the airspeed on the PFD went calm for the whole cruise, as well as on the approach and landing. However the airspeed on ESIS kept jumping for the whole flight - even in cruise with no turbulence.

Are you using Activesky or what for real time weather?

[CS-TMT]

ActiveSky P4 or whatever the name is, for P3Dv4, RealTurb (all packs), AccuFeel, with turbulence disabled both in general and the aircraft specific settings.
On ActiveSky, I'm on "realistic" settings however with turbulence enhancement UNCHECKED.
However it's the only aircraft in which the airspeed indicator acts like this.
If you need me to record a small video clip I can do so tomorrow comparing two or three aircraft.