Was This Helicopter Doomed By Design? đ Air Disasters | Smithsonian Channel
VloĆŸit
- Äas pĆidĂĄn 5. 08. 2024
- Investigators looking into the ditching of Cougar Flight 91 on March 12, 2009 zero in on an oil pressure problem in the main gearbox. Did a fatal flaw in its design cause the oil inside to leak?
From Air Disasters: bit.ly/3ppP92T
#AirDisasters #PlaneCrash #SmithsonianChannel
Subscribe to The Smithsonian Aviation Channel: bit.ly/2UNavJO
Twitter: bit.ly/33lH712
Instagram: bit.ly/3iw9Iay
Facebook: bit.ly/3kkVOZ - ZĂĄbava
Hint: If you ever see a Smithsonian cameraman in your helicopter jump out.
Agreed
Agreed
Agreed
Agreed
Agreed
"So what went wrong?"
"Right... here."
"Oh the big red circle marked on the schematics?"
Ani oop
The oil filter area leaks oil because of studs failure
Finally not 5 years late
Yes
Same
gaha
Aeroplane
Same
In 1978 I ditched a Sea King helicopter (Sikorsky design) due to main gearbox oil pressure failure caused by a filter bowl failure. Forty years on and they still design gearboxes that need positive oil pressure and have crap filter bowls. I also flew the Westland Lynx and that was cleared to fly for up to half an hour after oil pressure failed - because it was properly designed.
Just so long as yours has the newer bolted rotor hub installed, or the old one is less than 3500 hours...
I did inspections on the threaded stud that held the MGB filter bowl. Found a few crackedâŠ
They did finally modify it
Terrible design it should screw on like an everyday oil filter then use 3 bolts to lock it in place so it doesnât unscrew itself also use lock wire. I would design it where there is a secondary cylinder/housing covering the filter which is also sealed so if there is a problem u donât loose oil and have a pressure sensor on the secondary housing so if it sees pressure you know thereâs a problem
Interesting. So this problem is nothing new.
Helicopter: about to crash and kill many people
Smithsonian: *upbeat music* âItâs brighter hereâ
đ€Łđ€Łđ€Ł
Nice!!!!
Good old Smithsonian, leaving us on a cliffhanger that only 3% of the world can find out about if we are in the right country.
People can watch the full show on the internetâŠ
Service Alerts are not mandatory. Airworthiness Directives are. Seems there are a few details missing in this story.
"I'm gonna go get the papers, get the papers."
So Sikorsky identified the problem and instructed operators to fix it, and the operator didn't fix it. And people died.
lol. brain damage
No they had 1200 flight hours or one year.
No, Sikorsky identified the problem, created a notice that was financially beneficial to them and bet that no failures would happen so they lowered the urgency, operators were aware and followed the notice to Sikorsky's letter, and THEN people died, but guess what Sikorsky saved money.
@@SMG_Wizard are you saying that because you work for them or because youâre making a guess?
Oof
I had the same thing happen to me on a Bell 212 combining gearbox. Stud pulled out. Engineer had made an unorthodox stud repair with a sealant instead of re-tapping threads. I had been deep over the jungle moments before it failed.
Hello to everyone 9 years from now.
If you read this i'm probably dead
@@gjfudjfiugig1432 In two days ?
@@tomf3150 lol đ but what if it is true đđ
Hey
Wasup
The flames were probably brighter.
@@clydelabios344 Actually, spongebob debunked this fact. Smh my head smh my head
The ending isn't bright is it?
*Slamming sound*
âAw hellâ. âDispatch were ditching.â
đ” itâs brighter here đ” đ
If they had the gearbox right there to see if the studs were gone would they have not seen them gone already? Like wouldnt that be the first thing you do, inspect the gearbox as they knew there was a loss of oil pressure
@Kevin Smith yeah but theyre acting all surprised its that there is no bolts in the thing. When they saw there were no bolts they would have come to the exact same solution of why it crashed
2:35 wow. amazing insight. the galling was cause by the only thing that could have caused the galling.
Who would have thought ?đš
the design had been previously used elsewhere without problems but this helicopter required a high amount of unexpected filter changes.
amazing the cameraman survived !!
Whenever something bad starts to happen, grab a camera. The cameraman always survives.
Same thing possibly happend to Irish Coast Guard Rescue 116. It was an S92
I have become an addict of this channel đ
Always the smallest things that lead to a big crash.
a sole survivor along with victims families sued Sikorsky
Does anyone know where to find the whole episode? If so can someone give me the link?
This is a job that could have been completed in an hour. It is nothing to take those studs out, put in new helicoil inserts and and install the new steel studs. I used to be a helicopter mechanic in the Army, and worked extensively on the Sikorsky UH-60 Blackhawk. Had to do repairs like this many times during my career, it is literally a nothing job. It only becomes hard if the studs snap off during the extraction process, even then, you get an easy out, tap it, and back it out, so it adds like 15-20min of work.
because of access, the 92 filter bowl studs are pretty hard to reach. Ive done this mod and its a few hours on the 92.
it sounds like the nuts were one problem. Another was the gearbox was supposed to be able to run 30 minutes dry but couldn't. There's a whole list of recommendations resulting from this accident.
www.tsb.gc.ca/eng/rapports-reports/aviation/2009/a09a0016/a09a0016.pdf
@@bc1969214 Yes, nuts were one problem .... the nuts sitting in a corner office at Sikorsky.
Yes these are the best ones
Yea that's a chopper đ
Lol
If this is a known issue with these two metals then why use them in the first place?
Money , politics , cutting corners......usual crap probably.
@@3chords490 isnât titanium more expensive than steel ?
@@vin_jha
Itâs also lighter, and lighter means less fuel consumption.
@@vin_jha Isnât steel cheaper than titanium ?
@Kevin Smith
titanium is more expensive than steel but lasts longer. titanium would need replacing as often thus saving a little money, plus lighter, weight lower fuel consumption.
All helicopters are doomed by design. Many years ago, I attended a flight school in Dallas. We all went to a nearby bar at night which was right by the Bell helicopter factory. I talked to engineers in there working on the Osprey flipping over and killing Marines at the time. I asked them about choppers and they said they were nothing but a bucket of bolts rattling apart and none of them would ever get in one. Apparently though, they fixed the Osprey problem. Helicopters are just inherently unstable and unsafe in my opinion. I'll take an airplane any day over a chopper.
Don't be like that mate.My dad was a bell 212,412 pilot while he was in the Airforce now he flies H130
Isn't osprey flipping over due to one rotor going into vortex ring state while the other did not? Helicopter cannot land vertical at high speed due to descending into their own rotor turbulence causing VRS. This is a physics phenomena cannot really be "fixed". Single rotor helicopter probably can recover better than dual rotors cause both rotors won't going into VRS at the same time. Once the chopper flip over due to imbalanced lift it is impossible to recover. I wonder how would they do the fix? maybe detect lift imbalance and auto reduce lift on working rotor?
The last thing you want to see in a helicopter is loss of oil pressure in the main transmission. You put the aircraft down immediately. Never mind what is underneath you. You only have a few minutes before the transmission ceases and the main rotor breaks off.
Things are a little different when "what is underneath you" is the North Atlantic. In this specific case the pilots were given a time that they could operate the transmission without it locking up, even without oil pressure. The gearbox would get trashed over this time but it would get you to land. Total loss of fluid is what actually happened via the filter cover, and this was not designed for nor anticipated in the risk amassment. The filter cover leaked because two of the three titanium filter housing studs had fractured as a result of inadequate preload causing a fatigue fracture. That was either galling or installation error, but that single mistake shouldn't take down a helicopter that's designed to operate far off-shore like this one. Google TSB A09A0016 if you would like to read all about it.
Dontcha love studio cockpits !
For maintenance to not swap out the studs quickly like they should have took nuts of steel
It's much more brighter here
PLOT TWIST: The sole survivor was the cameraman
Lame
đđ»
Hi
Wow
No, google says there are 2 survivors.
Narrator has a nice voice â„
How could we be on time for this video
You had one job maintenance!!
Thus, why you actually PAY ATTENTION to your service bulletins from the manufacturer.
I had a cougar in 91.
So you guys didnt think your bolts would get stripped???
Am6 engine gearbox
Interesting
Itâs BRIGHTER HERE đ
the gearbox casing failed as in cracked.the pilots were alerted by a loss of oil pressure warning,however,in his misplaced wisdom,the pilot noted"hey oil temps ok",little realizing,the sensor was displaying gearbox air temp instead,cos oil had already spewed out.so pilot decides to descend to a 1000ft in a futile attempt to reach a safe landing somewhere,"hey,ditching from a 1000ft is more survivable than 4000ft? he should have put that craft down immediately on,or in the water,they all had survival equipment as standard,i dont like to speak ill of the dead,but that lack of judgment killed all except one,the gearbox shattered and it fell like a stone,no autorotation available and it makes my blood boil to this day,them poor workers died cos of a 2 fools in control trying to be heroes.if this truth hurts,it should.
According to the Sikorski Pilot Operating Manual, in the event of a MAIN XMSN OIL PRESS low:
"Catastrophic transmission failure will result in loss of helicopter control. Consideration should be given to transiting at minimum power airspeed and a low altitude flight profile (approximately 80 ft and 80 KIAS) to permit a quick flare followed by an immediate landing/ditching. Applicable steps of the Immediate Landing/Ditching emergency procedure should be completed."
Now, without the benefit of 20/20 hindsight and an FAA/NTSB failure investigation, it seems to me the pilots were not only NOT FOOLS, but they were doing EXACTLY what they should have been doing by the POH.
You know, except for the gross majority of them that are retired after a safe and loooong service life... unless it's an old Vietnam era Huey, in which case they are STILL being flown by private owners today.
@@rsrt6910 granted,but one thousand ft gave no one a chance,once it all stops spinning,helis become anvils,survival equipment useless if you are unconcious/stunned.so put the fool who wrote the manual on trial,he got it so wrong,then educate pilots about catastrophic gearbox failure and the consequences,then innocents will have a chance of survival.thank you for your reply,the whole incident still gets to me.
@@rsrt6910 on a lighter note,yes ,no commercial pressure,fastidiously maintained,id love to upgrade to a huey someday.
Make sriwijaya 182 pls
Bruh, 0:51 the tail rotor is on the left side
And 1:04 the tail rotor is on the right side?!
nuts.
But the gearbox is supposed to run without oil for 45min to 1hour
:32 dude is real sus
Air worthiness releases should be acted on, not shelved for a later service or inspection. I remember when gearbox failures where due to walnut shells in the oil passages.
Depends on the degree of priority the manufacturer and the FAA place on the release...If it's labelled immediate then yes...but in this case it would appear routine - to be done within a year or 1,200 flying hours...that sound urgent to you? Do you immediately perform all the advisories your mechanic suggests as "as and when" for your car?
Hmm
Uh oh, wasn't the new Marine One is a S-92?
đ€
New Marine One is a VH-92
What is with all these random video fragments of larger shows you're lazily putting online?
They want you to buy the full episode
Hi
see you in 5 years
oh, something that isn't just drama "it was horrible" dramatized re-enactments, hmm, this may be ok like the old seconds from disaster series that focused more on 'what' went wrong rather than only the drama around the disaster. what episode is this (S13 E3 "fatal approach" ok), and can I buy this episode on CZcams, yes I can, sold. ah, no, that's not this one!!! your bit-ly link is WRONG, that's not even a Helicopter GRRRR
season 15 episode 7, NOT what was linked to in the discription.
hm
Imagine your life ending because of a stud.
No dislikes
Titanium is costlier than steel. Why use titanium in the first place ?
I believe titanium weighs less and is stronger
What is the chopper type
Watch the video...đ
I will never understand why some manufacturers go for exotic materials like titanium or carbon fibre for parts where weight is not a concern. For so many applications, the strength, toughness, and dependability of plain old carbon steel simply cannot be beat. Its chief disadvantages are its weight and the possibility of corrosion-neither of which is a concern in a glorified bolt constantly bathed in lubricating oil.
Notice that Sikorsky replaced the titanium bolts with steel. Not aluminum. Not carbon fibre. Not adamantium. Steel.
Because it works.
@Jean Pierre Boichut C'est vrai.
Actually, pound for pound, aluminum is both stronger and tougher than carbon steel.
@@rsrt6910 But not by volume. Neither are more exotic alloys like titanium. A titanium sword as strong as a carbon steel one would be the size of an oar, although it would still weigh less.
And the size of the bolts to be replaced is fixed, I believe.
Weight is a big issue in helicopters. Anything that can be made lighter is made lighter. Unfortunately lighter is not always better.
The use of titanium and aluminum has made many things possible that would not be possible using steel.
The key is knowing when and where to use each type of metal. Aparently in this case they did not use the proper metal and when the mistake was discovered it was not taken seriously.
@@Bendigo1 Yes, it can be easy to take weight savings too far. But if you've got to cut back on pounds, cut seat count instead of safety. Just one bad crash can finish an aircraft model and sometimes even the manufacturer.
Back in the 1970s, an engine fell off a DC-10, causing a crash. It was entirely the airline's fault; they cut corners in maintenance and damaged the engine pylon, and didn't buy the stick shaker option for the first officer's station, only the pilot's. This meant the crew weren't alerted to the coming stall, even though the DC-10 can fly on only two engines just fine.
But it was bad form to knock the customer, so Douglas took the hit. The DC-10 was savaged as a winged coffin in the press, and the media circus pretty much ended sales of that model. And that was long before social media and cancel culture.
yes one month late not 15 years
The dramatization is such a cheesy time-filler. Why?
"Claim Your Eliminate all early comments here."
Lol
Hold on, what?
Yes
hahaha
chicken.
Here is a basic idea ground all those type of helicopters until all the bolts are replaced when Australian helicopter had that mishap.
Woah July 2nd 2008. A few days before my birth.
Another reason I dislike helicopters.
Itâs not so much helicopters as a whole as it is this particular make of helicopter. Like, the harriers killed a lot of their pilots, but that doesnât condemn all types of planes.
A toyota crashes and kills everyone inside. Do you dislike cars now?
@@Bendigo1 I never liked cars.
So surely, following your logic, all forms of transportation are bad. Or what are the exceptions here?
Hello
No
àŠàŠŹà§
oh hey iâm early! time to make a tasteless cAmeRamAn joke :)
Early
Hi early people
First
Early
Hi
Too short ,not enough info...any vid that's 3-4 mins long i won't be wasting my time on .where is the whole story ?
behind a pay wall and only available in certain country's like the original Air Crash Investigations and Seconds From Disaster you have to pay and its only available in the USA
@@phalanx3803 Well that sucks .I have watched alot of the air crash disaster full doco's for free on youtube here in NZ.
@@tonyhawthorne3222 You could probably find it online somewhere. Iâve found quite a few episodes on dailymotion
14 comments
29th!
Annoyingly overdramatic. Watch Mentour Pilot's channel for compelling explanations of aviation accidents, although generally more focused on the crew actions and reactions than the engineering.
Itâs a matter of personal preference. What you consider âover dramaticâ is much more appealing to a general audience. If youâre really interested in aviation and shit like that then yes youâre better off watching something like mentour pilot
shoulda said Kobe
am here firstđ
No ur not
àŠŹà§àŠàŠ
Hate this 1/4 of the story...
Thumps Down!
38 thumps down!
In complete thought*
Oops
I Crashed.lol
First ez
This made me think about kobe helicopter
Kobe's was an S76.
Also, there was nothing mechanically wrong with Kobe's ride, it was a case of "get there-itis" and inadvertent flight into IMC.
Unfortunately Kobe literally flew into a mountain - there's a flight data recorder that confirms it. There wasn't any onboard failure. He flew into IMC (clouds) lost sight of the ground and flew straight into the mountain.
2nd like,view and 1st comment
RIP Kobe
That was an S79 and it was pilot error.
@@rsrt6910it was a s76
@@Toyota-ci3nj Dyslexia is a horrible disease.
Old fashion steel still that reliable. Take what the Russians do and always do, putting total trust on steel.
Like when they built submarines of titanium?
Studs are too expensive to replace, humans are cheap!!
Capitalism 101
Hi