Hidden Danger Part 5 - Air Crash Investigation/Mayday

[HACKERMASTERDESTROY]

seyyyy lets see the title says hidden danger eyyyy maybe the pilots can't control gravity so that it crashed Lol

[methanbreather]

well another case of greed at Boeing killed people.

[ObsenityofAtomicTech]

Notice the hero in this whole thing is some unname guy that just happened to have a clue about what the hell was going on. If not for him telling them about a military test done on military aircraft we would still be seeing these planes falling out of the sky while the feds keep looking for scratches on shafts not even knowing metals are frozen in solid state and expand and contract with temp. Still can not get over them expecting the part maker to find the problem for them.

[ObsenityofAtomicTech]

I hope they got that value right this time ! Did anybody get put in jail for designing that piece of crap servo valve? Were the people in management involved in screwing up the design process by inserting there egos into the science of mechanical engineering costing hundreds of lives? Strange how the people in management get let off when they get people killed, hide in there offices with security gaurds and lawyer to cover there asses. This I am sure goes right to the top managers at boeing

[ObsenityofAtomicTech]

I wonder if that so called thermal shock has anything to do with clearences between bore and shaft of these valve spools. When you have a sliding part of bore and shaft of one or more layers there are mcroscopic differences between the bore ID, and the shaft OD called the clearance. Some machines are assembled using heated bores onto chilled shafts to get the tighest fit possible. As they equalize in temp the clearce disapears and the shaft and bore merge. Different temps equal bigger clearances

[antonmigr]

so why did it roll in the first place? and why did all those incidents happen only when the plane was approaching landing?

[jayflies737]

It's a bird...it's a plane...no it's a SUBSCRIBER!

[alaskaair737400]

where can i find the songs or the music of this episode?

[FlyGirlz2]

I love watching these but they make my fear of flying worse O_o

[Twelaal]

I'm glad they fixed it because I fly 737's

[killerpigeon347]

@Twelaal wicked.... when im older i want to be a pilot... alot of hard work im guessing

[Pyrovex]

After the first crash the Rudder Servo units were tested under non-flight simulated conditions.This was an enormous error that directly attributed to the second fatal crash. The mistake was repeated after the second crash! Third time lucky??

[AndyMcArren1356]

hey guys u know something strange about A321? it looks kind of a the 757

[hazemelrekaby]

i do believe that if the dual servo valve performed in very cold ATM it might affects the way it works because lower temperature affects the fluid viscosity ... but how it can make it reversed !!!!

[BaloogaStudios]

toys with peoples' lives it's the airlines, as you can see in many of the other air crash investigation videos.

[BaloogaStudios]

Ok, I get what you're saying about grounding the entire fleet, but:

These were two flight out of what, 2 billion that went wrong. If you grounded the 737 for the 5 years it took to solve the case, you'd be halting 50% of aerial transportation worldwide. The global economy would suffer, so would progress in almost every field.

Grounding a plane like the 737 is never an option! Has anybody said to ground the A330 after the crash of Flight 447? No! Exactly! If anybody is a money saving pig who

[hmsrenown]

You did see the NTSB investigators nightmares about congressmen questioning why didn't he ground the fleet...

Of course in reality, congressmen would only do so if there is political gains to be made, it's the sad truth.

[theirishmaniac08]

Yeah same her I'm 17 now and I flew from about 1993 on wards on mostly 737's

and I do agree it's all about money,they do seem to toy with peoples lifes as you think that if there was two unexplainable incidents they would ground the fleet until the found the problem.

I would have never thought the 737 could of been a deadly plane with that problem it was probably more likely to crash then the older versions of the DC-10

[emokid991]

so sad..

[blackaurora44]

Wow, one of the investigators is comedian David Brenner's brother.

[JanuaryDiamonds]

isnt it common sense that if the rudder seems to be jammed to one side that you at least try steering to that side anyway to see if it unsticks it? didnt they say that would have leveled the plane in the reversal? id do that when im flying rc

[alexisonfire01]

10 years my ass! I cant believe they waited 10 years before thinking of putting the rudder mechanism through extreme enviromental testing. Thats one of the first thing I would of thought of after the first crash. Idiots.

[pele7208]

I agree!!

[Sotigris]

They knew the plane was problematic for 10 years!They are assholes!They let the 737s fly,another fatal incident happened and nearly a third escaped danger out of pure luck!They KNEW!They ARE KILLERS and now they are PROUD that they solved the case!THEY SHOULD HAVE GROUND THE BEOING as France did with Concord!I cant believe how they are allowed to play with lives and wait for another one to fall down!This is not a trial and error procedure!There are lives at stake!Fuck you and BOEING AND MONEY!

[nicandic]

France grounded the concord fleet because of magar problems which happened on 9/10 flights... Do you no how many 737's are flown a day??? about 3000 YES! three THOUSAND and 2/3000 you get my point... but NTSB new that they would find the answer or wait for all the evidence possible before even thinking of grounding the MOST PROFITABLE fleet in the world.

[covladuk1985]

I agree, they play with people's lifes every year, when theres an accident and they know it's technical they don't ground the whole fleet to save money. They are killers yes for waiting for more planes to crash and people to die. It's all about SAVING MONEY instead of peoples LIFES. Who gives a f**k if they save a few Bucks, I'd rather have my life than abit of money.

[Persiangulf127]

i didn't get one thing in the end, where did the metal pieces in the hyraulic fluid come from? there were filters and they weren't from the metal bar cause it wasn't scratched in any of the cases so ...?

[nicandic]

When the plane crashed the fliters inside the valv had been distroid, and these are the little picese which were floating around in the hydraulic fluid, and thats why the NTSB never found the filters.

[HoustonRocket101]

I never liked the 737

[uploader1010]

the A320 is better

[nojoke602]

Yes,The Airbus A320 I think is alot better than boeing's 737.

[uploader1010]

yeah.

[Darthbelal]

Hats off to the NTSB dudes who worked a very long, hard, arduous, tedious and perplexing case in trying to figure out why two 737s crashed. 737 pilots everywhere owe those guys a beer.

[TheMrMarilyn]

@Darthbelal  Ah think the PASSENGERS "owe em a few beers" as well...they'd get a LOT more pints if you include them in the equation too!!

[crazeegye]

jesus, i flew on a 737 in 1994,this could have happened to me,fecking hell.

[Heterodyne]

You and millions of people.

[nicandic]

yeah but you in a cold area... because if you flew over lets say the atlantic nothing would have happened but pittsburg and other places have cool mountains... making it even colder outside up 30,000 feet in the air! but if u going in a cold place jesus must REALLY like u man! ;)

[ProtoCosmos]

At 30,000 Ft it's freezing no matter where you are.

[6Zebulon5]

@ProtoCosmos How very true

[HACKERMASTERDESTROY]

@ProtoCosmos ya

[BoeingRules]

I love the ending, the most popular, most profitable plane in the world. No other plane like the 737.

[FunkyZangel]

Actually, why did the plane all of a sudden roll to right or left? As in, did the pilots do anything or was the movement of the rudder involved?plz tell me....thx!

[darian5]

Yea it seems to me like the NTSB never explained what caused the roll over. I think it was the wake turbulence or in fact the cyclonic wind from the mountains. The cyclonic winds from the mountains is something that a pilot can't see therefore no way to avoid. Unless they invent new technology that will let a pilot see wind currents.

[FunkyZangel]

Oh okay. Thanks alot! :)

[arvyyy9]

Following on from my previous comment, I have to say that I am not convinced with the NTSB's report based on this documentary. I am lead to believe that the Valve has simply malfuntctioned in reverse due to some other design fault that is probably caused by wear and tear over the decades. Boeing replaced all these valves because something was basically wrong with them. In fact a lot of 737s started to fall out of the sky around that time from memory. Bound to happen with aging of parts. Retire!

[unknownkw]

They tested all rudder volves in 3 cases they were working properly. What happened is when the part heat up from -40C (typical temperature at high altitude) injected with 77C hot hydrolics, the volve indeed malfunctioned. It come back normal leaving no trace behind when the volve warmed up. That's why it happened only when decending to land.

[unknownkw]

Both crashs happened when the plane is rolled slightly when passing uneven airflow, the pilot pushes on the rudder trying to correct the orientation but in fact it instead caused the rudder to lock in place in reverse direction that added to the spin, making it unrecoverable.

[arvyyy9]

One of the most compelling ones that I have watched in the aircrash series BUT .. something critical is not explained properly. What actually caused the cervo valve to go in reverse!??. The tests showed that extremes of temperature made it malfunction...OK..so where were the extremes of temperature on the actual flights that crashed!??. That is not explained at all to my reckoning. Where was the extremes in temperature on perfect flying conditions?!!. There is no proper link here!.

[textthing]

Good question. I thought the freeze test was reaching for straws, myself. And yet in other cases the NTSB has reached for the 'pilot suicide' explanation.

[HOTEGETY]

There is another factor that contributed to these two crashes and many other crashes, but they have never been considered, mentioned, or attempted to solve even from the design stage.

The solution to eliminate this factor has been used on a few aircraft, but it is extremely rare. Wonder who would be able to come up with what I am referring to?

[DieterMe]

Normaly a loss of ONE Ruder can be Handled.

It should be blocked in middle Position (save Backup).

A blocked Ruder in Outermost position can not be Handled from Pilot.

I'm in Service for thermal treatment of part's (electronic Devices) and those Test's

are very interesting on fail.

Almost Electronic Devices kann not handle this -50 Centigrade in

high Altitude every time and if you want to USE them... it's frozen/useless.

Boeing's are OK. I was in US 1986 and had some flight's, good Planes.

[andfranca]

I juast don't like the boeings they go up very fast! still enjoy the airbus better! :D

[darian5]

Airbuses are in fact less durable than Boeings. I think Boeing is a much more durable manufacturer.

[andfranca]

i meant they climb very fast, it makes you kind of dizzy!

[nicandic]

No exactly Airbuses are less durable because they are made for small flights... boeings on the other hand are made for long flights... so if you compare the air crafts the their proper "field of play" they are the exact same.

[maximalminimum]

What is the reason for these problems to pop up suddenly in close succession in the 90's but not before then, since the 737 has been in operation since the late 60's? The only thing I can think of is that the age of the parts somehow caused them to become susceptible to malfunction.

[ProtoCosmos]

With that in mind, I wonder if they redesigned the dual servo valve,or if they just replaced them with new ones of the same design,with the idea that it probably takes thirty years for them to falter.

[frankairlines]

Great episode! Thank you for posting all!

[geckodust]

hello, can i have a small request, i'm a big fan of these vids, however i can't really tell which part i would be clicking on the related videos as the title is too long and it turned into ... instead of telling me what part it is... i know it's some hard work, but it would be great if the parts are at the front of the title instead of the end. :)

[AirCrashMayday]

Sure

[geckodust]

thanks for the prompt reply, loving the vids :) (tho i don't like this narrator, the british one was much better imho)

[AirCrashMayday]

you like the english accent better?

[geckodust]

yep, this one you uploaded has a strange rhythm that sort of drives you to fall asleep..

[AirCrashMayday]

sorry bout that , I have no power to change it

[geckodust]

no i am not complaining :D it's fine really. the show itself is great enough for me to complain :]

[ProtoCosmos]

Can you please re-upload the entire series and make it so the narrator has a heavy Scottish accent, like Grounds keeper Willie or something like that? You know I'm kidding,right?

Seriously though, thanks for these fantastic vids.

[kenmarkdebbie]

@AirCrashMayday IMO - i think the canadian narrator is FABULOUS! i love his accent and i love the rhythm - sometimes it does make me sleepy - but tbh - thats a good thing. his voice is very deep, well accented and pleasant to the ears! i love him! ok ok enough of that i'll man up now - but PLEASE download more of his 'mayday' shows - love em to bits = big thanks to u for the uploads!

[MegaMaster456]

@AirCrashMayday take it from Nat Geo?

[TheMrMarilyn]

@AirCrashMayday You DID change the titles as well...wow...now thass what ah call 'service' LOLol!!Ah love your uploads too...extremely fab series!!x

[TheMrMarilyn]

@geckodust You DID change the titles as well...wow...now thass what ah call 'service' LOLol!!Ah love your uploads too...extremely fab series!!x

[lectocom]

Thanks, ACM, this has been a great ACI episode.

[MrBillUp]

Thanks very much ACM, top episode 5 stars!!! Ah the ole rudder reversal rears its ugly head again :-(

[Anonymity0]

again? When did this happen before (other than the 3 in the video)?

[Blatpoppin5]

umm in the description of part 1 of this episode it was explained

[kdmq]

first to view O.O

[AirCrashMayday]

lol , thx