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What the heck was that noise at 3:15?!
The PTU system, its hydraulic fluid being transferred in the aircraft.Usually this sound is heard during engine startup and shutdown
![Tampa to Houston-Intercontinental [Full Trip] [United Airlines] [Boeing 737-900ER] [4K]](http://i.ytimg.com/vi/y6ftp9WZM_k/mqdefault.jpg)
![Tampa to Houston-Intercontinental [Full Trip] [United Airlines] [Boeing 737-900ER] [4K]](/img/tr.png)
What the heck was that noise at 3:15?!
The PTU system, its hydraulic fluid being transferred in the aircraft.
Usually this sound is heard during engine startup and shutdown