Originally Posted by
DLdweeb
My first time in coach on an A320 I heard this on final and had no idea what was going on. A pilot friend told me it was the hydraulic system equalizing pressure. Don't know if that's true or not but it is an interesting sound.
Yep...I was once on FLL-JFK on an A320 and as the dog-bark sound was going during pushback, no less than 10 passengers called the FAs over to discuss...it was to NYC..."This is not what a regulah aehplane sounds like..." One FA replies, "Oh...that? That's just...like...you know...the motor warming up..." and then she hurries away. Hmm...