Currently inflight with the sound off, due to a horn.

 

The horn is the same as the horn when take-off config is not set properly.

 

It happened around 20000ft, I have no warning lights, nor any messages on the FMC.

 

Anythoughts ?

 

Jack

I think there is a button on the overhead called ALT HORN CUTOUT. Maybe...try it. Second column from the right at the bottom.

Are your packs on? Sounds like the cabin isn't pressurized.

Rubber jungle in he cabin. :Party: Me says Noah points at the cause.