Originally Posted by
Derfred
. . .
So something, observable to the pilots, happened prior to the prop shear, which was enough to prompt a shutdown. Were these "uncommanded engine operations" the cause of the prop shear? Or perhaps merely a symptom of the prop partially shearing prior to completely shearing? Is the gearbox still ok?
It was noticeable, and worsening, vibration which motivated the crew to shutdown #2. It was during this sequence the separation occurred.
Per
Investigation: AO-2017-032 - In-flight propeller malfunction involving SAAB 340 VH-NRX, 19 km SW of Sydney Airport, NSW, on 17 March 2017
And while I'm sure the PGB will get a thorough teardown inspection, I don't see anything at this point that would be distressed, other than possible bearing brinelling.