Folks:

 

Would someone tell me what this alarm is and how to silence it.

 

Load the default panel (engines running, etc). Then fail the AC STBY BUS. Wait a few secs and you will get the alarm.

 

Thanks!

 

James

I think that is the alarm to notify you that you are running on battery power alone, and no generator is connected.

 

You hear it as well if you don't start the APU or connect the ground power.

It alarms ground crew that battery drain condition exist. You can turn off right IRS to silence it.

If the IRS systems is operating on DC power only. after 20 seconds on DC power from the Battery the crew call horn in the nose wheel well will sound when the Left and/or Right IRS system are still ON, When only the Right IRS is on DC power it will automaticlly shutdown after 5 minutes. When the Left IRS system operates on DC power the crew call horn will operated until the IRS is switched to OFF or when is AC power is restored.

 

Also the crew call horn will sound when the equipment cooling has a failure (not simulated on the NGX).

Nice. Thanks guys.

James