solved Strange buzzer at startup

[st1322]

Hi,

I have version 1.21. Each time I load up the plane I get loud buzzer sound that stops when I either connect to ground power or start APU. Is there a way to get rid of this?

Tom

Edited April 7, 2018 by Morten

[Morten]

Can you record a video of this, have not heard of it before?

[mfor]

Do you have the IRS systems turned on by chance - that causes a buzzing sound for me.

FWIIW you can turn on standby ac power which will feed AC to the left IRS (but drain the battery) and allow you to align it without the buzzer. The right IRS will turn itself off after 5? minutes without AC anyway.

[Litjan]

I think mfor is right - when the right IRS is being fed by DC only (you should see the corresponding amber warning light), you will get a horn sounding - it is the same horn that sounds for the low-airflow warning if the equipment fans aren´t running.

To avoid this, always enable AC power supply before aligning the IRS units. If you operate the plane according to the book, you will never hear that horn.

Cheers, Jan