Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.
No, no, Lawman has right - its a radio altimeter alarm signal. You can set up a level or turn on / off by knob (left console) or switchboard on front panel (the first switchboard from right on the top line - center console, front panel).
The switch I'm referring to is number 129 in the manual. It's not on the main panel, but the console on the left side wall. The leftmost position kills the sound.
Here is the power:
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Here manager of alt alarm - meters only ("Bklucit" - means turn on/off too):
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Well, it looks like you went through a lot of trouble doing things in reverse, LOL :salute:
What I mean is that when you start the aircraft with Ctrl-E, it turns a lot of stuff on that you have to shut off.
If you follow the actual startup procedure from the manual, these things are left off by default.
Sure, it's one way to learn where everything is in the cockpit. But then again....
Glad you got things sorted out.