Tubine engine blade fail test
Why Aviation Stack Exchange recommends it
Aviation Stack Exchange answerers link it as a concrete illustration of a fan blade failure and how violent and damaging it is, even when the engine contains it.
Recommended by 0 people across 0 different months, 2014 to 2020.
What it is
A 2m15s clip of a certification-style blade-off test on an airliner turbofan engine. A small explosive charge releases a fan blade while the engine runs at speed, to check that the casing contains the debris. The upload is a re-post of footage originally from sonicbomb.com.
Cited in 1 Wikipedia article, including Blade off testing.
What people said
Cites fooot · 2014-10 · Aviation Stack Exchange · on “Is engine damage due to a fan blade failure irreparable?”
Jet engines are fairly expensive, accounting for a large part of the cost of an airliner. So there will be some incentive to repair the engine if possible. Whether an engine is repairable is dependent on the failure. If it happens at startup and mostly causes a bunch of smoke, like in the linked video, then the damage may be fairly limited and will probably be repaired. If damage is suspected, a borescope inspection is generally done to check the inner parts of the engine for damage as well. If a failure happens at full thrust [this video] , the engine is probably finished. Aircraft and engines are designed for this failure, but a full blade failure will cause extensive damage. Parts that get loo
Cites fooot · 2015-04 · Aviation Stack Exchange · on “What are the indications that your turbofan engine has "thrown a blade?"”
Turbofan engines are designed and tested to contain a fan blade failure [this video] . However, this is a violent event and will cause serious damage to the engine. The engine and surrounding components are subjected to large forces and vibrations, and the engine can ingest debris from the damage to the fan, causing further damage. There will likely be an investigation, and the engine will probably be scrapped due to the widespread damage to different components. To the pilots, it will seem like a bird strike, but probably worse. There will be a loud noise as the fan blade separates and collides with the fan case and following blades. The fan will then be out of balance, so heavy vibrations will
Cites Anthony X · 2018-02 · Aviation Stack Exchange · on “How hazardous is it if an engine cowl falls off?”
Your question implies/infers that the aircraft merely shed a few non-critical parts. That's not a very accurate description of the event. Based on the missing fan blades, a more likely description is failure of at least one fan blade leading to collateral damage, including loss of the cowling. It's a pretty violent event - see [this video] and [LINK] . That renders the engine inoperable, and for a 777 leaves you with only one good engine.
Cites MaximEck · 2020-10 · Aviation Stack Exchange · on “What is the most severe engine failure for modern turbofan?”
Here are my initial finding so far, and I will add information that I find along the route: There seems to be two types of engine failures. Tested and untested ones. The ones that the engine are certified for through test are the ones that are likely to happen in the fleet life. And therefore, the engine manufacturer must show that those kinds of failure will not put the life of the passenger at risk. The other are unexpected incident that shouldn't have happened and are certified through numerical analysis. The most extreme scenario in the tested failure category seems to be the fan blade out. The unbalance created by losing a fan blade creates huge vibrations and breaking torque when the f