UAL flight 328
Observations of the video available showing the engine failure and fire aboard United Airlines flight 328 on Feb 20 2021.
From the point of view of an engine guy.
Here is a link to P&W's page about this engine:
Here's an operating manual for the P&W4000 series engines for pilots:
The Turbofan design engineer referred to in the video is my friend grahamj9101
When the final NTSB report is released, we will see how close or how far off the mark I really am.

  • Bewm B.
    Bewm B.

    I still don't understand HOW thrust reversers caught on fire. I am guessing one of the chipped-off fan blades damaged the oil line (probably B-sump scavenge oil line) when it flew out the back. But what exactly caused that oil to ignite? The outer temperatures and constant air flow made tough conditions for flames to go on. It must have been a tiny fuel leak, so when pilots popped the firewall shutoff valve the flames went out.

  • Dave Shepherd
    Dave Shepherd

    Thanks for spreading the truth!

  • HuckThis1971

    I worked at Rolls-Royce Canada and I knew right away it was missing fan blades from that wobble. Engine design did its job of Containing the failure. Kevlar ring did its job. Worse case engine mounting bolts would have sheared and engine would have detached.

  • Dennis Salisbury
    Dennis Salisbury

    The reason I ignore the MSM at all times, they are worthless clickbait whores not worthy of the title journalists.

  • viperdriver82

    I believe what they meant by "not an emergency landing" is that they won't have to brace during the landings

  • Calvin Dodge
    Calvin Dodge

    To be fair, some blade fragments made a hole in the wing-body fairing on that side.

    • Calvin Dodge
      Calvin Dodge

      @AgentJayZ Thanks for the info.

    • AgentJayZ

      We don't know they were blade fragments, to be fair...

  • Joe Danay
    Joe Danay

    Thanks, Jay! I'm 4 days behind on this. Glad there's no injuries. Passengers will need laundry services;)

  • Dr. Qaiser Haider
    Dr. Qaiser Haider

    You are the guy who exactly knows what you are talking about. The total control over the subject. Love it.

  • Star Trooper
    Star Trooper

    L.p. shaft would break it's designed to fail in blade out event.

    • AgentJayZ


  • grahamj9101

    I've seen Juan Brown's latest video clip, which he posted outside the Albert Hall in London, after a ten-hour flight with tons of Californian asparagus in the back. I'm sorry (not really), but he got a black mark from me for being thoroughly irresponsible, and doing walkabout when we're in lockdown and being told to "stay at home"

    • BC AD
      BC AD

      Did you see his next video with dozens of people milling about with no masks.

    • John Watkin
      John Watkin

      He was outside, not close to anyone. It’s important to take the virus seriously, and doing that requires a nuanced understanding of what is and isn’t risky behavior. What I saw him doing in that video wasn’t a danger to anyone.

  • Yogib37

    just found your channel. I agree with you on everything. I subcribed to the blanco channel and what you said about him is spot on, but he tell it in a normal way so other people can understand. I dont like the Media just jumping in and say it is this or that, I knew even before the picture was uploaded it was caused by a blade the let go. I guess the media has never seen pictures on a normal engine change that the Nacell's are still attached to the plane.. You are right it is part of the plane. I am an A&P but have not been working on planes for a very long time.

  • abcd60528

    Very true that it was very lucky!

  • David Sullivan
    David Sullivan

    For the media, this is an entertainment event. The more drama the higher the ratings. Facts are not relevant.

    • Mikeydude001

      People personally involved in something the media reports about knows that the media usually gets the facts wrong. Then we go on to the next story and believe it? LOL.

  • Ron Adams
    Ron Adams

    Thanks for the break-down and info. Good stuff, well presented!

  • Herbert Laughlin
    Herbert Laughlin

    I think that the fan blades failed due to metal fatigue and 1.5 fan blades exited out the front taking the engine inlet cowling and the main cowling mounting bracket with it. In addition, it appeared from the video that the engine lost all of it covers when the main cowling support bracket was severed by parts of the fan. That 8 foot long heavy chunk of metal that hit the street next to an SUV, heard audibly, falling from 14,000 feet, gaining speed every second until impact could have cause catastrophic damage had it hit a home. I bet when they examine the broken blades, they discover that they failed due to loss of stiffness. The same thing that happens to steel ships on the ocean. They are forced to be retired do to metal fatigue. Metal that flexes looses stiffness and after a period of time, it breaks! Why are they ignoring the facts????

    • azonicrider32

      @Herbert Laughlin Dude, you are explaining the abc's to rocket scientists..

    • Herbert Laughlin
      Herbert Laughlin

      @grahamj9101 Thanks for your comment and I agree. I suggest that hollow blades on larger applications may have increased stresses not previously determined?

    • grahamj9101

      The industry knows far more about metal fatigue than you do - obviously. Components such as blades are designed to avoid excessive excitation that will result in them having unacceptably low fatigue lives, and they are rigorously inspected at repair and overhaul for any signs of fatigue. Major components, such as discs and shafts are designed to a 'predicted safe cyclic life' (PSCL), but are cleared for only a small proportion of their PSCL at entry into service, with lives being extended progressively, by means of sampling and inspection. It is probable that there is some internal non-conforming feature, relative to design intent, in those blades that have failed, which cannot be inspected easily. The vast majority of blades have, after all, run perfectly safely for tens of thousands of hours. If they hadn't done so, then there would have been the risk of engine and/or cowling debris being scattered around the world years ago, and PW 4000 engines would have been grounded years ago.

  • Almerinda Romeira
    Almerinda Romeira

    So the giant hole in the fuselage was already there?? It IS an uncontainned failure engine...

    • Almerinda Romeira
      Almerinda Romeira

      @Yogib37 you shouldn't rate it for how bad it was, but how bad it could have been. I know its non critical but if it broke it, it could easily also have ruptured a line or cable behind it. After all composites have sharp edges. I'll wait for the final report, as I'm not so convinced it was just a cowling piece.

    • Yogib37

      @Almerinda Romeira that is an aerodynamic fairing.. It is nothing but just a thin piece of composite. Nothing under that was damage and it was not caused by the fan blade, It most likely was part of the Nacell that broke off and hit it. It is still a contain engine failure. The engine was in tack and not scatter all over the place

    • Ron Adams
      Ron Adams

      Sorry, I corrected my original response. I'm not sure why, but I typed "uncontained", when he actually said they did "not consider it to be uncontained". Regardless, I understand the liability issue.

    • AgentJayZ

      Ron. It is a very important detail. Who gets blamed for the millions of dollars in damage... the aircraft maker or the engine maker? The NTSB has decided this was a contained engine failure. The blame game is complicated, but crucial.

    • David Sullivan
      David Sullivan

      @Ron Adams That was his initial judgement, but since has been revised as more facts become available. (I say facts not speculations!)

  • SIE44TAR

    11:18 "I gotta say, the journalists know nothing. They don't know anything." Yep, that about sums up today's media.

  • yankmyfinger

    Great analysis JayZ. Good Job. I agree with everything you said. Retired airline pilot here. This was a textbook simulator event. We would train for this type of event every year. The weather was good. It was daylight. Great airport, Aircraft, ATC and well trained pilots.

  • Nicholas Pratt
    Nicholas Pratt

    Where did the missing 1½ fan blades go after leaving that cut in the front air inlet ring..

    • Robert Slugg
      Robert Slugg

      @grahamj9101 Yes, I saw that, but portion is pretty non-specific. I am guessing that it is smaller than "chunk." ;-) I did once work in a lab where smidge, tad, little, and lot had specific numerical values assigned to them.

    • grahamj9101

      @Robert Slugg Juan Brown, in his latest Blancolirio video, reports that a portion of one fan blade was found stuck somewhere in the casing, "at the one o'clock position", while another portion of a fan blade was found on the sports field where other debris fell. Which portion is from the blade that suffered the primary failure, and which is from the blade that is assumed (for the moment) to have been brought off by the primary failure, we'll have to wait for the NTSB.

    • Herbert Laughlin
      Herbert Laughlin

      My question too. Thanks Dude!!!

    • Robert Slugg
      Robert Slugg

      Speculation is that one blade cut through the front cowling (large diagonal slash) which then accelerated that separation as an intact piece. Will be interesting to see where and when the blade fragments are found. 99.9% contained is probably the more accurate assessment if 34lbs of carbon and/or titanium exited the front on the way down. If blade is rotating at 600 mph and plane is flying 200 mph then the odds are higher that the blade will go forward at that point in time. But what do I know?

  • supercat380

    Excellent commentary and analysis, Agent JZ! Nice to hear some logic after all the nonsense expressed by the fake news media and other so- called aviation experts!

  • paulsautocm

    BRAVO, this is why I follow you and Blancollrio. Keep up the GREAT work!

  • Rocco Sound
    Rocco Sound

    Excellent video, keep up the good work. So nice to hear cool calm engineering facts. Ive been an engineer working on PT6 TPE-331 and CFM56 for the last 33 years. This is a bit similar to the Southwest Airlines 737 incident in which the tremendous energy from the contained engine failure caused the cowl hinges or cowl latches to fail, thus causing the cowl to break up and separate from the airplane. Most people don't appreciate the amount of energy involved in a broken fan blade. In both the Southwest incident and United 328 incident the engine failures were contained. Well done to the boys who designed the debris containment shield-it worked as advertised.

  • Brian Whippen
    Brian Whippen

    How many engine hours on this engine or the fan would be more important because that seems to be the actual failure. More importantly probably landing takeoffs would give more insight I’m sure the experts will figure this out and make a correction. I am a mechanic as well, think about the load on that blade when the engine is nearly full thus going down the runway.

    • azonicrider32

      Ya they should check the mileage on that puppy, probably way past its oil change!

  • a4yster

    Is that Moldovan flag?? Surprising to say the least!

  • Armorer 94
    Armorer 94

    According to Blancolirio, the 1/2 blade was found inside the compressor stage. The complete blade is still MIA.

  • android emulator
    android emulator

    Calm , lucid , sensible facts .. thanks :)

  • William Pickett
    William Pickett

    Was that a JT-8 C-2 Fan disk that you had leaning their on your right

    • AgentJayZ

      RR Spey

  • yxvpjs

    Jayz ... what engine behind you ... very interesting ... does it P&W J75 ... (just guest)

    • AgentJayZ

      Orenda 14 out of an F-86F Sabre / Canadair Sabre 6

  • Android811

    I would NOT like to be the guy who signed off on the last fan inspection when the FAA comes knocking.

  • mer8771

    Thank you for putting the truth out, I just wish people or the human condition would allow people to believe it. I've seen you stand up for what is right over the years and I think you for it. People really need to question everything and not believe the first person who opens their mouth or speaks the loudest. Truly an unbelievable job you do to disseminate knowledge. 👍 Juan Browne or, blancolirio is great at the other part of aviation just as you said.

  • First Last
    First Last

    One blade or part of coming off the fan disk and causing the damage that it did is by all technical definitions, an uncontained engine failure. It's not drama, it's a simple fact.

    • Kalvinjj

      The strict definition of an uncontained engine failure is that any debris or engine parts that fail penetrate the protections and exit through those protections. Simply put, the engine's cowling cannot hold the parts inside, does not contain them. A part that exits through the back of the engine for example, but didn't manage to open the protective rings is still considered a contained engine failure. Same if the part got stuck on that protection but didn't exit through it. The engine covers you see from outside don't count for that definition, they're mostly there for aerodynamics reasons. If it does whoever open up a hole through it, that in turn is uncontained. The definition itself can only be properly applied after inspecting the engine tho, from the angle seen it could very well have been uncontained if there was a hole open on the side not seen by the passengers, tho there wasn't thankfully. AgentJayZ could have been far more helpful on the reply tho no doubt. just that whole lot of "ignorant" there helped literally no one. If it was well defined on the the video, a time stamp would be enough. Otherwise, just copy and paste the definition also works.

    • AgentJayZ

      You are completely incorrect. That is forgivable because there is a very strict definition of uncontained, of which you are completely ignorant. FYI : on Feb 23 , the NTSB described the failure as contained. So you are doubly ignorant. Put that on a sticker, and have a grown up stick it on your back. Then go away. Thank you.

  • TransitBiker

    “The engine exploded” direct words from news outlet.

  • Brother Malachai
    Brother Malachai

    Wanted to share this as a pilot spoke on the same incident from his perspective.

  • mikoyanfulcrum1

    I love it how boeing's stock took a hit yet Boeing doesnt make engines,.... Stupid public!!!

    • Android811

      That's a buying opportunity!

  • Brother Malachai
    Brother Malachai

    When the investigation report inevitably comes out, can you come back and comment more on this incident from an insider's perspective?

  • Mark Grant
    Mark Grant

    Journalists over reaction is so sad. Love you guys always!

    • Brother Malachai
      Brother Malachai

      Journalists are going to muckrake. "If it bleeds it leads."

  • BMachine2

    Thanks AgentJayZ, always glad to learn from you. Can you do a followup on this once they have the whole story?

  • fzj801996

    Thanks AgentJayZ for posting this!

  • Cheezy Dee
    Cheezy Dee

    I'm an aerospace technician with approximately 7 hours of experience watching turbine engine videos and I have conducted my own investigation of the incident and I have concluded that the engine went "kaboom", not the "Big Badda Boom" as reported in the media as there were no burn marks on the wing and apparently no holes in the fuselage as the passengers were able to video the wobbly smoldering engine. I also believe the engine is not shaking due to imbalance but it is in fact shivering due to it's clothes being ripped off in midair in subzero temperatures.

    • AgentJayZ

      That's pretty weezy, Cheezy Dee, but I like it! We could use someone like you, to translate between shop talk that the people working on the engines use, and whatever flavor of double-speak garble that management uses this year. "moving forward" I'm barfing now...

  • Steve Roberts
    Steve Roberts

    Really glad you got that off your chest Jay :D

  • Jaja Jaja
    Jaja Jaja

    This is not the first time these engines has failed . Next time it can be worst . I believe the FAA put a service warning out on these engines.

  • Luk S
    Luk S

    Love the engine vids thanks for explaining.

  • theonlyari

    With this much sensationalism, imagine what would happen if there was a pandemic!

    • Robert Slugg
      Robert Slugg

      They have contained themselves to only be off by an order of magnitude on that one, so far, IMHO. There is a lot of difference between dying "with" something and dying "from" something, which got lost a long time ago.

  • A Mascia
    A Mascia

    Like you said: could have been much worse. Sometimes things work. 👍🏼🤠

  • DJ

    Vibration causing the cowl separation is more credible than the intake cowl being sliced off by a bent blade. Should the engine have been shut down earlier when excess vibration noticed as this would have saved the cowls.

    • Curt Austin
      Curt Austin

      @Max Canine I think Juan is wrong about this. The outward centrifugal force on a liberated fan blade is much, much greater than any aerodynamic force - it goes directly into the containment structure. In fact, you'll notice that the kevlar blanket is offset a bit aft of the plane of the fan - don't know why, but that's where the engineers expect it to go. Perhaps the following blade pushes it aft. The busted upper half of the other blade - collateral damage - might be different, but I don't see how. In any case, the 'slice' (not necessarily a slice) in the nose ring might have occurred in several other ways. After all, it fell a long way, then hit a pickup truck!

    • Max Canine
      Max Canine

      Intake cowl was sliced by the departing fan blade. See blancolirio website and see photos.

    • AgentJayZ

      The vibes were caused by the fan blade breaking. Before that happened, I'm sure the vides were normal.

    • B B
      B B

      You weren’t there so you don’t know when excess vibration occurred in relation to the cowl separating.

  • MrSwimfinz123

    Nice report, very interesting. I love your delivery. We all do!

  • Earth Wisdom Productions
    Earth Wisdom Productions

    One news reporter I listened to, based on some ATC exchanges, reported the pilot saying “... heavy engine failure...” Of course this was the pilot identifying himself as “328 heavy.”

  • Darcy Hildebrand
    Darcy Hildebrand

    AgentJayZ: What is your take on the photos of damage to the fuselage adjacent to failed engine? Caused by broken fan or turbine blades?

  • Master Warning
    Master Warning

    I saw photos of a large hole in the wing root area underwing section right up against the fuselage. It looked to be about a foot by 2 feet in length. Also, the flight crew can make the Mayday call to ATC and later downgrade the emergency claim. So the pilots telling passengers that they are not in an emergency..I.e. not expecting aircraft loss/further damage or passenger loss..may very well have occurred

    • Kalvinjj

      My bet for that hole is likely that engine cover being torn off and ripping through that part. Thankfully no hydraulic/electric lines ruptured that affected enough on the flight controls.

  • Steve Flor
    Steve Flor

    It is amazing to me that engine pylon DID NOT fail. And, it was able to withstand the immense torque generated by the inbalance.

  • Mike M
    Mike M

    Looked like the fan blade may have cut the forward cowling/shroud detaching it and the fan blade went out forwards (perhaps a combination of pressure and momentum from the collision.. Doesn't that make it an uncontained failure even if not a whole disk? If all the fan blades are generating pressure aft doe it mean that one blade can be blown forward by the pressure generated by all of the others?

    • Kalvinjj

      the thrust from the blade itself would just turn it sideways to the position it encounters equilibrium, and then the air around (and suction from the rest of the engine) would just push it back. An entire fan disk failing without losing it's round shape, still rotating (let's say, it detaches from the shaft clear) might propel itself some amount, but if that is enough to maintain it going forward after no torque is applied to the shaft (if it fails of course there won't be any), I would say is unlikely on flight conditions, on ground tests it probably can propel itself some amount but not with the airspeed they have up in the sky.

    • Mike M
      Mike M

      @Njål Nilssen Have done. But with one and a bit blades floating around at high speed they could hit the wall and at that speed with leverage I could still see bits going forward. The witness marks on the cowling will be interesting.

    • Njål Nilssen
      Njål Nilssen

      Angular momentum force trying to pull the blades out radially are ten-folds higher than any foreward momentum provided by thrust. If in doubt watch videos from "blade-out" test done during engine trials.

  • Justin Simonsen
    Justin Simonsen

    I learned more from your video in three minutes then anywhere else. Also you are very funny which helps.

  • Craig Tripney
    Craig Tripney

    Looks like some parts did get through ..........

  • Craig Tripney
    Craig Tripney

  • that guy
    that guy

    how much does a jet engine overhaul cost?

    • AgentJayZ

      Depends on the engine. One of these commercial airliner engines will cost many thousands of worker hours and likely a couple million in parts.

  • T4L0N57

    Why do people listen to the media at all anymore? Has the media done anything you useful for like the past 20 or 30 years? We need new media, old media is dead.

    • James Gray
      James Gray

      When ratings, clicks and views are what generates revenue, the truth is the first casualty. What passes as “truth” now has more to do with who is paying for it than any actual facts or reality.

  • None None
    None None

    seems like there have been several "lost shroud" exposed engine failures in the past few years

  • Karl Goebeler
    Karl Goebeler

    Understand that there was another failure in the Netherlands Same type Go figure

  • Kosmonooit

    The nacelle seems to have been sliced by the blade, whether that was the prime reason causing it to depart... ? Titanium shaft? Blanco was also saying that possibly some of the fire containment system might have gone for a walkie with the cowling (?)

  • David Clawson
    David Clawson

    Sadly, for news reporters, it doesn't really matter what is real, it only matters what people will believe and what will keep the advertisers happy.

    • Mike Earls
      Mike Earls

      That is a really really broad brushed statement. It basically throws the entire trade of reporting right under the bus.

  • Christian Cormier
    Christian Cormier

    Awesome stuff AgentJayz!

  • New Republican
    New Republican

    Yo, dude . . .! At 2:42 you say "one and a half fan blades have broken off", but at 2:24 you say "the engine is all there". Not to split hairs, but aren't those fan blades part of the engine ??? There are also a half dozen contradictions throughout your presentation that indicate to me, that you're not being entirely accurate in your description. Semantics ?



    • Ken Hildebrandt
      Ken Hildebrandt

      @AgentJayZ Very well said. Thank you once again...

    • AgentJayZ

      Ahem... What I was saying was all the major engine assemblies were still there, where they were supposed to be. So anyone who said the engine "exploded" did not know what they were talking about. I still say that. Also, there not being any huge breach in any of the engine cases, this appeared to a contained engine failure... meaning that any fragments that broke off the rotating machinery did not escape the containment of the cases. Your semantics are both vague and unnecessarily pedantic. Your three question marks detracts enormously from your credibility. I don't care what my presentation indicates to you, as your level of understanding of the issues is insufficient to allow you to make a valid contribution to the discussion. You had an opportunity to learn here, but you chose to judge in ignorance, and to complain. It happens a lot on this channel. A lot of people like you are uncomfortable with changing their limited understanding of the world through adjusting to new information.

    • Brendan Cooney
      Brendan Cooney

      @New Republican the engine is the turbine while the blades which broke are of a large fan, ie the whole is a turbofan. just like an electricity power generation is composed of a gas turbine engine and of a large generator. two separate parts joined together

    • New Republican
      New Republican

      @Brendan Cooney Semantics, dude . . .! If the fan blades, compressor blades, shaft, etc are not part of the "engine", then what exactly IS the engine . . ., and what constitutes its failure ?

  • Charles Bartholomew
    Charles Bartholomew

    Thank you for sharing your expertise. Engineering is always an interesting topic.

  • Blockstacker561

    I've heard reports of passengers hearing a "bang", do you have any ideas what that could have been?

    • Brian Alleman
      Brian Alleman

      A fan blade on that engine probably weighs 40 or 50 pounds and is travelling incredibly fast as it spins. That amount of kinetic energy suddenly being unconstrained would probably make one hell of a noise.

  • Mark Beard
    Mark Beard

    Agreed that the blade containment system behind the fan did not release engine components, but that’s not the whole story. It seems that a fan blade failed, left the engine and cut the leading edge trim. The trim then left the aircraft, exposing the cowling behind to the airstream, and that cowling also left the aircraft. Is this an accurate description, going by what is seen on photographs of the leading edge trim? If so, does the damage to the aircraft (the leading edge trim) by the failed fan blade constitute an uncontained engine failure?

    • Graham Haynes
      Graham Haynes

      Blancolirio suggested that that the broken blade exited the front of the engine and caused the slash in the nose cone. I'm not saying this didn't happen but at high power settings, broken blades are normally ingested rearwards into the engine, not thrown out of the intake. The nose cone flattened the roof of a truck when it fell to earth and it may have been spinning. I'm more inclined to think that the nose cone damage was caused by impact after it detached and not by the broken blade. Either way, it's the NTSB investigation and FAA safety responses that matter.

  • Morgan Welk
    Morgan Welk

    BBC News was reporting that the engine “fell off” the aircraft.

  • Graham Haynes
    Graham Haynes

    Thanks for the excellent engine summary. It's good to hear it from somebody with the relevant engine experience.

  • tom kent
    tom kent

    If they shut off the fuel supply why is the engine still burning?

    • c7042

      Possibly lubricating oil leaking from an overstressed bearing. I say this because it is a low intensity flame. Jet fuel burns a lot hotter. Wait for the report for more information.

  • AL Dor for shore
    AL Dor for shore

    Oh the wonderful truth-telling. media, they once put out a story that a girl drove 2000 feet off of a cliff and survived for 4 weeks with multiple fractures broken ribs and concussion sucking water out of rocks😂 and then taking selfies and smiling when she was found just a few miles from homes on a beach 😳🤣

  • Jim Mork
    Jim Mork

    At least the engine didn't fall off like the American Airlines engine did in Chicago. Then the plane flipped. So there is a "good news" story in this event.

    • Jim Mork
      Jim Mork

      What I said: AA 191. Engine disconnects, plane flips on back. Faulty maintenance by contractor.

    • kimmer6

      That was American 191, May 25th 1979.

  • Harry King
    Harry King

    Was about to ask if the engine was complete scrap or not, thanks for answering that.

  • Dan Wood
    Dan Wood

    It's always hilarious to hear the media talking heads using terms they've never heard before, acting like they're experts.

  • Ja So
    Ja So

    I believe Juan said that the blades that detached traveled forward and ultimately caused the slice to the inlet lip. If that's correct, technically it was an uncontained failure because the blade(s) exited the engine

    • AgentJayZ

      JA SO, nothing really wrong with your reasoning, but you don't get to make definitions up. All of the text books define an uncontained failure as one where pieces penetrate and exit the engine cases. This seems to be a rather special case where the cases were not penetrated, yet pieces managed to damage the aircraft anyway. The panel says: uncontained failure with an asterisk.

    • c7042

      Well it was at least an uncontained cowling failure.😎😎😎

  • Filthywings
    Filthywings NTSB preliminary hearing on the accident. It didn’t breach the containment ring. My bad

  • mightysprocket

    Qantas 32 called pan pan pan, while they assessed indications, failures and remaining capabilities

    • j2simpso

      and I always thought Pan Pan Pan was the call sign for PanAM. I'll see myself out 😅

  • Kali 808
    Kali 808

    Finally, someone who is making sense.

  • Brian Kimmell
    Brian Kimmell

    Best video on this incident.

  • Gary Manis
    Gary Manis

    I am no expert at all, but does this look like a hole where part of what I believe is the thrust reverser is missing?

    • Gary Manis
      Gary Manis

      @AgentJayZ Thanks for the reply. I'm not sure where the contest or debate references come from. I'm just trying to understand what I'm looking at and you did put out a video attempting to explain what some pictures of the engine are showing. I appreciate your knowledge of jet engines, which is far greater than mine. That is why I asked the question. Thanks again for the reply and your educational videos.

    • AgentJayZ

      Gary, this is not a contest, and not a debate. We all just want to find out the details. The tear you are looking at in this photo is the wall of the bypass duct. The duct, and the reverser are actually inner layers of the nacelle. In the description of this video I have placed a URL for P&Ws own cutaway drawing for the PW400-112... this engine. The outside of the turbine cases are not even close to being exposed in the photo you reference. I'm only here to share information. Some people call me an engine expert. Some call me unqualified and uneducated. I build jet engines for a living.

  • leetxjd

    This is a great analysis. Journalists don’t write or share the facts anymore. I am glad there are channels like this. I’ve subscribed!

  • Filthywings

    Captain Joe called it an uncontained engine event

    • Micah Butler
      Micah Butler

      Good for him. Proves not everyone with a UZload channel is correct, eh?

  • Filthywings

    Greg Feith said this was an uncontained engine failure.

  • Lightpaws Hird
    Lightpaws Hird

    Okay, now I have to speak up. Seen too many replies to this man's video from people who don't know what their talking about. First off this man's video is 100% correct. Engine pieces were completely kept internal as they are designed to do. Now from a professional standpoint, I am an x-Airforce Airframe repair specialist. All this "damage" to the main body of the aircraft from all the same photos you all saw were NOT from the internal engine parts. All this other damage was done by the cowling that shredded and came off. When you have all those exterior pieces flying around they will do strange things and they will move aft of the engine. A high speed blade would have gone nearly straight into the fuselage of the plane (some variance for speed of course) but my point is clear. If you do not know what your talking about from a professional stance then please stop posing as someone who knows it all.

    • Lin Chester
      Lin Chester

      @Filthywings Some of the cowling also struck parts of the B777 but as NTSB describes as just covers and it didnt struck any important parts of the wing structure.

    • Filthywings

      But it DID go into the fuselage.

  • Kenneth Blackwell
    Kenneth Blackwell

    Good job. I watch Blancolirio (spelling?) Juan...He certainly is the best. News Media never get it right.

  • treborg777

    I just saw new pictures of the aircraft on the ground, and there is lower fuselage damage near the engine. However, the damage is behind the plane of the fan - if the fan blades had penetrated the kevlar shield, they would have sliced into the fuselage near the forward wing root, not back by the landing gear.

    • Leuven is a place
      Leuven is a place

      @Lin Chester Bingo. Cowling may have struck the aircraft during/after detachment. Whether it be an engine part, or merely aircraft part that is normally fixed to the engine, if it falls from great height, it may create conditions inconsistent with ongoing life for organisms at lower altitudes. Perhaps there is a specific category of engine failure that causes aircraft component to detach, whereas "contained" and "un-contained" have very specific aircraft engine component related definitions. JayZ/Juan for the win!

    • Lin Chester
      Lin Chester

      Some of the ripped off cowling struck parts of the B777 from the looks of it

  • 1epton

    The reason why the flame and blue smoke was coming out was solved.  very thankful.


    I'd bet the shaft was bent... any takers?

    • FTATF

      Without doing any math, im drawing on my experience as a merchant mariner and dealing with smaller horsepower... but also lower rpm. I could be wrong, but id bet

    • AgentJayZ

      Maybe, the fan bearing is huge, like a meter in diameter...

    • Lin Chester
      Lin Chester

      each blade is 34 lbs so when you have 1 blade and a half missing, the shaft is a goner here

  • 3rik R Vargas
    3rik R Vargas

    Dear Jay. There's this picture on Twitter ( ) I guess this is, by far, the most clear evidence of what happened. As you say at the end of your video, it looks that a blade broke but was contained by the duct fan. Perhaps, once broken and ingested, it damaged oil or fuel lines and then the explosion of the engine and fire that some people reported. The shaking that we see in those videos you are referring to is a consequence of the imbalance due to the loss of this half blade. If this video is related to the incident ( ) the airplane had already ended the stressful take off and it was climbing (still stressful). Great video!

    • 3rik R Vargas
      3rik R Vargas

      Mr Jason Rabinowitz (@AirlineFlyer) did a great job collecting as much pertinent information as he could.

  • Matt Lawless
    Matt Lawless

    The vibration, to my eye, seems to be due to a dynamic imbalance. I’ll bet it was simply a missing fan blade and not a bent LP-Fan shaft.

    • AgentJayZ

      I think you are correct.

  • Paul1958R

    AgentJayZ, Thank you for your professional analysis and opinion. There are some close up pictures of the right side of that engine on Simon Hradecky's Aviation Herald which shows more damage. In one of them it even looks like you can see a piece of a fan (?) blade hanging down from the front bottom of the engine. Thank you Paul

    • 3rik R Vargas
      3rik R Vargas

      Paul, I watched the video that Trevor Bryant calls to watch and there's one picture of what seems to be a blade... but it doesn't seem to be of the big fan, it seems to be from an inner stage or it is one of the pylons that give support to the nacelle.

    • Trevor Bryant
      Trevor Bryant

      Ya, just saw this video and there is a lot more damage.

  • bassmith448 bassist
    bassmith448 bassist

    Good point Jay. Yes. The engine is all still on the wing. What fell to the ground were Aircraft parts. Not Engine parts. Sounds like we had an uncontained media failure.

    • c7042


  • Phillip

    Something heavy went through the roof of a house. Any idea what that could have been?

    • c7042

      @David Fritzel Kind of unfair but funny comment though. The crew kept it together and appeared to be very professional about it. In all, this appeared to be a very well managed emergency. 😎💖😎

    • Lin Chester
      Lin Chester

      pipe or parts of the gearbox assembly unit that got ripped off. They sit outside of the main burning core of the turbofan but under the cowlings.

    • Xcaliber Trekker
      Xcaliber Trekker

      A tree?

    • David Fritzel
      David Fritzel

      The pilot's full diaper

  • 88SC

    I’m not sure about this early 777, but most cascades being installed on current airliners are graphite epoxy.

    • AgentJayZ

      That makes sense. Very light and strong. Resistant to heat, but would still burn very slowly with a reddish orange glow that would appear dark compared to a normal flame.

  • Mike McLennan
    Mike McLennan

    A 16-minute video that the tv media have under a minute to cover.

  • Francis Conti
    Francis Conti

    Thanks brother!

  • Jon Thomson
    Jon Thomson

    Haven't heard anyone talk about the possibility of the cowling not being snapped shut completely before leaving the gate (I'd like to know if Maintenance had it open while it was on the ground, Check the log book) or maybe a lav panel unsecured flying into the engine and breaking the blade which cause the fail. I've seen a DC 10 come into the gate totally mangled and the blades shot through the sides of the engine. This was not even close to that kind of obvious damage Curious to see how they explain this one

    • Jon Thomson
      Jon Thomson

      @Xcaliber Trekker True.. So many layoffs in the past year. a Recipe for disaster . My daughter just went back to LAX from HNL on a United 777..Scary stuff Where did you see the other photos?..Thanks

    • Xcaliber Trekker
      Xcaliber Trekker

      @Jon Thomson Yea many of the aircraft have been stored for a while due to covid slowdown and many probably not properly maintained. Also saw there was significant damage to the fuselage as well from either debris or fan blades but it was a big tear. Looks like it was probably unpressurized area thank goodness.

    • Jon Thomson
      Jon Thomson

      @Xcaliber Trekker Thanks ...Just took a look.. I think that's spot on. I wonder if they had any issues prior... and how many signed off figuring it could wait until the aircraft was scheduled to go in Things we'll never hear about I'm sure

    • Xcaliber Trekker
      Xcaliber Trekker

      Guess you didn't see my comment.

  • Booby Hatch
    Booby Hatch

    Thank you I like Juan Brown too Hello from PicoRivera

  • bemm69yah

    Great vid Agent Zulu. Here is a link to a doc that defines contained & uncontained turbine engine failures.

  • Will Hibbard II
    Will Hibbard II

    Great Presentation! Thank you!

  • Thomas Martin
    Thomas Martin

    Let's think about this. He can't see the engine from both sides, only a camera shot from a window. He explains the damage to the engine with a diagram from another engine!? Oh yea, the's not there. There's no fire because the fuel has been turned off. I guess the pilots panicked when they called out a Mayday! It'll take the FAA months to analyze the failure and write a report. In the meantime, everyone's an expert and the media are idiots.

    • Xcaliber Trekker
      Xcaliber Trekker

      We already know what happened I explained it in my comment genius. Why the blade snapped we don't for sure yet. But if you had any brains and did simple research you would know as well yet your mouthing off to someone that knows much much more then you.

    • AgentJayZ

      Thomas, please read the description before mouthing off. Thank you.

  • darrylr

    Great video. I'm curious what does a large compressor blade cost?