Hi,
I got an anoying problem I can't solve - maybe somebody had the same and can help me...
At FL450 (and only FL450) I hear a "Bing-Sound" every few seconds (about 30 sec). If I descend to FL430 for example the anoying "Bing" is gone. So I thought that must have something to do with the cabin altitude. But everything is green - and even if I change cabin alt to Manuel and decrease cabin alt the "bing-sound" (kinda like the seatbelt sign remains...)
I tried every knob - I just can't turn it off. And all systems are green (no yellow or red)...
Would be great if somebody knows the answer ;-)