Uncontained RR Trent fan blade failure

[NutLoose]

This may help.

[NutLoose]

Film in the cabin, a fair bit of vibration there from the engine failure.

https://weibo.com/2084223127/NvsnKpNXS?pagetype=profilefeed


https://s.weibo.com/weibo?q=%23东航mu721航班故障机舱画面曝光%23

[MechEngr]

It may not be the energy of a single blade that does the damage, but the outward impulse from a broken blade getting plowed outward by the remaining blades in the fan. A similar effect happens in explosions from IEDs where the blast and fragments from the IED doesn't penetrate, but it gives the vehicle hull a sharply rising deformation that leads to pulverizing or kicking loose anything on the other side. The deformation doesn't have to be large if the item on the other side has not gap and has good conduction from the impulse. Given that it separated part of a second blade and split a third, the initial blade fragment got a pretty good smack before the containment ring let it escape.

[DaveReidUK]

Originally Posted by MechEngr

the initial blade fragment got a pretty good smack before the containment ring let it escape.

We don't actually know that the containment ring didn't perform its intended function.

[PPRuNeUser0203]

Originally Posted by DaveReidUK

We don't actually know that the containment ring didn't perform its intended function.

In fact we know that it DID.

Remember this aircraft has suffered one of the most violent failures possible. And it flew and landed safely.

Job done.

[MechEngr]

Originally Posted by DaveReidUK

We don't actually know that the containment ring didn't perform its intended function.

The "it" was the impulse. The impulse clearly escaped.

[tdracer]

Originally Posted by NutLoose

Film in the cabin, a fair bit of vibration there from the engine failure.

Airframe vibration is a big concern - it can be almost unimaginably violent. There have been reports of the vibrations after a Fan Blade Out event being so severe that the crew can't see the flight deck instruments.

I can't think of any FBO events that have resulted in an extended diversion time before they were able to land, but there are serious concerns that if one occurred in the middle of a 180 (or longer) ETOPS flight, the extended exposure to that level of vibration could have highly adverse effects on both the aircraft and the flight crew performance. And the move to ever larger fans means that the FBO vibration levels are just going to get worse.

[NutLoose]

Originally Posted by tdracer

Airframe vibration is a big concern - it can be almost unimaginably violent. There have been reports of the vibrations after a Fan Blade Out event being so severe that the crew can't see the flight deck instruments.

I have had that in real life when the aircraft we were running spat out the IGV’s through the turbine and up the detuner coming out the top like a mushroom cloud, we couldn’t read a damned thing and it stopped seized in a couple of turns when we managed to chop the fuel.