|Quoting LHB727230Adv (Reply 13):|
I know this is a stupid question coming from me, but what exactly is a PTU and what is it used for?
|Quoting Klaus (Reply 5):|
One forum member has once explained that Airbus explicitly wanted to have the PTU sound clearly audible to make troubleshooting on the ground easier. I don´t know if that´s exactly correct, but it might be an explanation. Newer versions are reported to be somewhat less noticeable (also from earlier threads).