It is hard to say from that brief description.
It “could” be a conflict with something in the community folder.
It sounds like you are using the A320, is it the default or a version of the mod?
Were you doing anything, climbing through clouds, icing conditions maybe?
I was at 38,000 feet, KSFO → KSEA, no clouds at that altitude. No icing messages, but the first time it happened, I turned on wing and engine anti-ice - which did not clear the tone. Was flying the A320NX FBW mod, installed using their installer, development version as of yesterday afternoon.
A mod conflict could explain it.
The A320 mod is very susceptible to that.
If it keeps happening, and you want to find out what is causing it, start by eliminating conflicts first.
If you have anything in the community folder, empty it, (or rename it, MSFS will make a new empty one) and see if it still happens.
Yeah, that all makes sense. To be honest, I didn’t expect that anyone would be able to resolve the problem - because as with many issues associated with something as complicated as FS2020, I just can’t give you any good repro steps. I did, however, want to get it out there to build an anecdotal record, at least, in case anyone else is experiencing it.
An interesting possibility, although I would have hoped that ATC would have warned me that I was off the assigned altitude. 1,000 feet is a deviation that I’d surely hope would trigger that?
Yes, I did.
I used the Cfbw type of the mod, and at cruise, about halfway to destination it happened.
Steady, higher pitched, but not overly loud.
Due to your post, I clicked the Master Warning (which wasn’t illuminated) and the tone silenced.
Strange.
Strange thing? Didn’t affect my flight, it just had me scanning the entire panel furiously looking for something that was about to affect the stability of the aircraft. And I’ve had flights where it happened twice.
First time for me, clear cold night flight, no clouds anywhere at 37000, so no icing.
It didn’t really sound like a normal warning.
A lot lower in volume.
July 2024 - Airbus A321neo PW, I hear this alarm repeatedly and finally tracked it down to speed setting versus actual speed. The indication shows on the speed indicator on the Captain’s Primary Flight Display (PFD). I find it is very difficult to get the speed slider set to the right position to maintain a speed setting at higher altitudes (say FL360). I suspect a similar problem occurs at lower speeds on approach to landings.