US fights metal fatigue on B-52H with pins

In the United States, a B-52 strategic bomber maintenance and upgrade program is being implemented. One of the points of the program being implemented in the United States Air Force is the fight against metal fatigue.

An example of the effects of metal fatigue at the B-52 is the case that occurred in 2017 in the vicinity of the Minot air base. Then the American strategic bomber “lost”, according to one of the messages - the engine, on the other - one of the gondolas with two engines during the flight. This separation from the suspension points (interpretation is more suitable for a nacelle with two engines) was associated with such an indicator as metal fatigue in the system of attachments to the wing.

Now, information is coming from the United States that one of the B-52H has arrived for overhaul in Oklahoma City, where a specialized service depot of this kind is located aviation techniques.

It is noted that for an aircraft with the number 61-001 from the 10 squadron of the reserve command of the US Air Force, the attachment of engines to the wing in its central part is changing. Strengthening of the central wing sections is also carried out using special pins, which, as noted, resemble a “milk bottle” in shape. It is added that the use of additional pins will allow for some time to overcome the problem of metal fatigue on aircraft that have been in the US Air Force arsenal for more than a dozen years.

The first flight of the B-52A was made 65 years ago - in the 1954 year, the Model B entered service in the 1955 year. In total, the 744 B-52 was built, and the last B-52H was put into force in October 1962.

Comments

[Krilovchanin]

Twin engines on pylons are not the best solution for such a machine: the load at the attachment points is too large, so the metal "gets tired" ... Besides, age. Tupolev did better ...

[bessmertniy]

The more they fight metal fatigue, the more likely they are that not all of these aircraft will reach the middle of the Dnieper.

[cniza]

The first flight of the B-52A was made 65 years ago - in the 1954 year, the Model B entered service in the 1955 year. In total, the 744 B-52 was built, and the last B-52H was put into force in October 1962.

At this age, it’s not surprising to fly up.

[YOUR]

You can use self-tapping screws, but it’s better to tape them. For centuries. Who would tell them.

[Naz]

Insulating tape.

[Civil]

Blue electrical tape, sledgehammer, wire and pliers to help them.

[Amurets]

Quote: Civil

Blue electrical tape, sledgehammer, wire and pliers to help them.

Some mother and all relatives to the fifth knee

[tarabar]

Blue electrical tape, a colleague, this is our method, they prefer adhesive tape.

[Pedrodepackes]

the American strategic bomber “lost”, according to one of the messages - the engine, on the other - one of the gondolas with two engines during the flight.

dangerous trend, one Boeing 747 DHL somehow happened

separation from suspension points

engine, so he (the plane) fell on the city of Amsterdam, and when you consider that this is a carrier aircraft of nuclear weapons, it’s completely sad.

[Rzzz]

The Boeing only was not DHL, but ELAl freight. I read about him. In general, he was wildly out of luck. He fell not from the fact that the engine fell off, and not even from the fact that the engine fell off demolished the second engine. And from the fact that the second engine fell off, demolished the flaps section and damaged the hydraulics, the plane lost control. Just without a motor - they would have sat down.

And this, the Boeing 747 in question, is not a carrier of nuclear weapons, in the Boeing B-52 it is a completely different plane.

[Pedrodepackes]

Quote: rzzz

He did not fall because the engine fell off

engine number 3 fell off demolished engine number 4 and engine number 3 pulled out 10 meters of the wing edge and not

Quote: rzzz

second motor fell off

So the cause of the disaster was precisely the engine that had fallen off, had it not been torn off its mounts, the flight would have ended where it was planned.

[Rzzz]

Well, I don’t remember by heart all the accidents. What I remembered, I wrote. Mistaken it seems not too much.

[Pedrodepackes]

Quote: rzzz

And this, the Boeing 747 in question, is not a carrier of nuclear weapons

actually it’s about

Quote: rzzz

Boeing B-52

about the 747th I mentioned only in the context of metal fatigue and the engine falling off as a result of this.

[Rzzz]

Quote: Pedrodepackes

about the 747th I mentioned only in the context of metal fatigue

And where does 747? A conversation like about the B-52, and this is another plane. About the metal fatigue, you can draw a sad story from the An-10, but why? Moreover, the B-52 did not seem to have problems with fatigue.

[Pedrodepackes]

Quote: rzzz

And where does 747?

Quote: rzzz

you can pull the sad story with the An-10

if you read the article carefully, you can understand what and that the An-10 certainly does not fit with these cases

[Cook]

Only not DHL a El Al, after that the fastening pins were strengthened, and their additional verification was introduced by means of non-destructive testing.

[Grigory_45]

Quote: Pedrodepackes

and when you consider that this is a nuclear carrier carrier aircraft, it’s completely sad.

AND? Remember how many bombs the planes lost "by themselves" (when they were much younger and their engines did not fall off)

[Pedrodepackes]

Quote: Gregory_45

Remember how many bombs the planes lost "by themselves"

And?
Or do you want a continuation of the "Marlezon ballet", just because the engines are falling off?

[Aviator_]

It was not from a good life that they placed a spark on a pylon - they did not have the necessary engines in the 1954 year.

[Krilovchanin]

It’s not about the pair. The strategist has the task of quickly taking off and gaining height. Moreover, in all weather conditions. To do this, you need a lot of traction (spark, by the way, a perfectly suitable option), but the mounting area of ​​the pylons is not enough in this case. I mentioned Tupolev for good reason. In Tu-95, motogandols are built into the wing. In terms of load balancing, this is a better solution.

[andrewkor]

I remember that if one of the spark engines is defeated, he can shoot back. Correct if not so.

[Krilovchanin]

I do not know. Maybe it can. But why?

[Pedrodepackes]

Quote: Krilovchanin

But why?

probably, the idea was such as to prevent the development of a fire on the wing with tanks, if the fire extinguishing means could not cope, and to reduce the resistance of the idle engine to the incoming flow.

[Pedrodepackes]

Quote: andrewkor

I remember that if one of the spark engines is defeated, he can shoot back.

Yes, there was such a bike that in general pylons began to be used to reset the engine in case of fire in it.

[siberalt]

And who has infa how many of these bombers fell due to metal fatigue? So, for the sake of curiosity.

[Krilovchanin]

I don’t think so much. Due to metal fatigue, airplanes rarely crash. This, after all, is not a shovel, they are being carefully monitored.

[siberalt]

Wonderful, however. For the usual question to the forum, Ukrainians are minus. Now let's see how many of them are on this site.

[Piramidon]

Quote: siberalt

Ukrainians are minus

But how do you know if this is Ukrainians, Americans or Israelis? Cons without an address

[Pedrodepackes]

Quote: siberalt

For the usual question to the forum, Ukrainians are minus.

or maybe this is your secret foe in the forum, remember who you "got" in the discussion? ))))
+ you, for balance

[Grigory_45]

Quote: siberalt

And who has infa how many of these bombers fell due to metal fatigue?

if you believe the American data, then not how much. There is a known incident with one plane - the one that "lost" the engine on January 5, 2017 in North Dakota. But he sat down on the rest.

[andrewkor]

SO drill holes (holes) under the pins and then reinforce these places?

[Pedrodepackes]

Quote: andrewkor

under the pins put holes (holes) drilled and again reinforce these places?

there is such an anecdote, a Soviet one, "during the tests of the aircraft under load, the power beam broke, as it was not strengthened, it still could not withstand. An old designer (Jew) was invited, he advised to make holes along the fracture line, shrugged his shoulders - and lo and behold ! The beam passed the test. When asked why, the old Jew replied: "Where did you see that toilet paper was torn along the perforation?"

[Piramidon]

Quote: Krilovchanin

Tupolev successfully made ...

After 95 years of operation, some of our Tu-20RCs began to show cracks on the planes due to metal fatigue. It was decided to rivet over the cracks of the lining.

[NN52]

Piramidon (Stepan. Russia)
Oh really??? And the tape was not "counter"?
Nonsense do not write about the lining ...

[Piramidon]

Quote: NN52

Nonsense do not write about the lining ...

It’s rude and foolish to take like that and indiscriminately blame lies. If you do not know about this, then this does not mean that this was not. I have personally walked on these pads for years. You can chat with my colleagues from the 392 ODRAP at the forum http://www.vologda18.ru/index.php/forum/index.
And you don’t need to build a wise guy out of yourself carrying nonsense about the electrical tape

And the tape was not "counter"?

[NN52]

I went in and looked at the forum. I need someone to ask about the riveted pads over the cracks to ask a question there? Stepan?
I'm not smart, but I can't stand the game ..
If you have forgotten something, then you do not need to pass off what you invented as real.

[Piramidon]

Quote: NN52

I went in and looked at the forum. I need someone to ask about the riveted pads over the cracks to ask a question there? Stepan?
I'm not smart, but I can't stand the game ..
If you have forgotten something, then you do not need to pass off what you invented as real.

Just ask a question on the forum. But in general, why should I make excuses for everyone who unfairly accuses me of lying? Stay with your opinion. Think the way you want to think. I wrote what it was. There was a lot of noise about these cracks. I served in this regiment for 22 years and I could touch these linings with my hands, but of course you better saw from the far sofa that they were not there.

Since March 1995, due to wing cracks, Tu-95RTs planes began to systematically take off from flights, they were revised
http://www.airwar.ru/enc/spy/tu95rc.html

[NN52]

So ... Stepan ...

In what year was Tu 95RTs "written off"?

And look at this link here ... http: //www.aviation-gb7.ru/Tu-95RC.htm

Are you sure you are not confusing anything?
In the mid-eighties, during overhauls, they began to identify cracks in the lower panels of the wing, they had to be ordered at the factory and replaced on many “sides”. It also pushed the Navy command to the decision to write off the entire fleet of vehicles and transfer their functions to Tu-142 aircraft ????????????

And I was not always on the "couch" ...

[Piramidon]

Quote: NN52

In what year was Tu 95RTs "written off"?

I understood you. You are trying to catch me on dates. I noticed this inaccuracy myself on the Corner of the Sky website. In our regiment, the flights of Tu-95RTs were stopped in 1993. I quit in 1991. By that time, several aircraft had these linings, not on the lower removable panels, but on the upper skin in the area between the inboard engine and the fuselage. And I cited the quote as evidence that there was a problem with cracks and the factory representatives (reworkers) were busy fixing it. As I remember now, when you walk on a plane, these pads came across under your feet.

[Grigory_45]

Quote: Krilovchanin

Twin pylon engines are not the best solution for such a machine

not from a good life. Engines at that time were low-power, and they had to put as many as 8 pieces. And so that the resistance did not increase much, but to fit them all on the wing, I had to put together two. In any case, the load was taken into account, what is currently taking place - not a miscalculation of designers, but rather a banal design fatigue.

[Engineer]

Installation of engines on pylons, first proposed by Ilyushin on the IL-22. This placement of the engine under the wing makes the wing cleaner in aerodynamics, reduces overall drag, supports the wing in flight, and makes access to the engine much easier. Therefore, this is the standard for passenger aircraft, where performance and economic performance dominate. Paired low-power engines do not give a greater load on the pylon than a single engine of the same thrust. This is school-level physics. The Americans then did not have a more powerful and economical engine. So we went to sparks. In general, the choice and placement of the power plant for the Americans is optimal for the tasks for such an aircraft. Tupolev made a rigid wing and set the theater. The wing structure had to be made rigid, which means it was heavily overweight. As a result, the B-52 loses both in flight range and in combat load. But Myasishchev made a flexible wing and relied on the gas turbine engine. The most powerful engines in the world at that time were not economical, but in combination with better aerodynamics than the Tu-95, the student surpassed the teacher.

[Grigory_45]

Quote: Engineer

Installation of engines on pylons, first proposed by Ilyushin on the IL-22. This placement of the engine under the wing makes the wing cleaner in aerodynamics, reduces overall drag, supports the wing in flight

Yes, why would resistance be reduced? On the contrary, it grows in relation to the placement of engines in the wing or in the fuselage.
Ilyushin applied a similar scheme because the first Soviet turbojet engines were characterized by low traction, but high accident rate. The motors were spread over the wingspan, and even removed from it, so that the fire of one motor did not affect the entire installation and did not affect the strength of the structure.

Now the engines are placed on pylons under the wing for the convenience of maintenance.

[Victor_B]

Oh poor fellow!
They do not have blue electrical tape!
Well, some kind of mother.

[Krilovchanin]

Some mother, definitely not. A tape, I think, is available. That's just it alone does not work as it should.

[Victor_B]

They have electrical tape. The colors are different. Including blue. (My son wound the blue one from the principle of his SCS)
But!
This is the wrong tape! Not ours! Not canonical.
She will not help them.
And she always helped us.

[Squelcher]

They have their own democratic duck tape called :)

[Victor_B]

Quote: Squelcher

They have their own democratic duck tape called :)

Do not pull their democratic TAPE versus our totalitarian! Orthodox!
And in the picture is a paper "painting" tape.

[Squelcher]

I agree, a faint resemblance to blue.

[Victor_B]

This is a nail from the opposite wall!

[Nevsky_ZU]

One of the points of the program being implemented in the United States Air Force is the fight against metal fatigue.

The best way is to use the US Federal Press. He will buy new planes, and more personnel, and competence around the world, if suddenly his own aircraft school has degraded
.

[rotmistr60]

No matter which pins you put, you won’t defeat metal fatigue. There is a term for everything.

[Victor_B]

Quote: rotmistr60

No matter which pins you put, you won’t defeat metal fatigue. There is a term for everything.

Anyway, you will laugh, but it is completely officially documented that the DC-3, which is LI-2, DOES NOT HAVE LIMITATIONS on the service life. Generally!

[rotmistr60]

Now, if his engines were mounted on pylons and the load on the wing would be more, then, as they say, we will look. More than forty years ago, I had to study resistance materials in the highest combined arms, so something about "metal fatigue" remained in my memory.

[Victor_B]

Quote: rotmistr60

More than forty years ago, I had to study resistance materials in the highest combined arms, so something about "metal fatigue" remained in my memory.

I at the university also passed a compromise on 5.
But there are eight! eight, Karl! engines!
And there were still cases (and not a few) when they burned and even fell off on the move, but he "held out to the landing lights"

[dzvero]

It looks like after 60 passports are issued unlimited, but before the deadline ...

[Grigory_45]

Quote: Victor_B

HAS NO RESTRICTIONS ON LIFE

nonsense. Metal is metal, it all depends on the intensity of operation. Any equipment has its own resource, ribs and other power elements will begin to fall apart, not to mention the skin - it is probably patched-rolled, there is nowhere to drive a rivet.

[Amurets]

Quote: rotmistr60

There is a term for everything.

And a one way ticket

[Amateur]

Holes at the end of cracks with a drill must be drilled.

I give it!

[Piramidon]

Quote: Amateur

Holes at the end of cracks with a drill must be drilled.

As our teacher on "military repair" said - "Holes, there they are, they walk down the street in mini-skirts, and they drill HOLES"

[Amateur]

In a Soviet airplane, holes. And in the American - holes!

[Shopping Mall]

This is a cool airplane, without exaggeration. Not every ship will last as long as it is, there is a chance to reach the 100 years. According to the latest data, the US plans to leave two types of bomber in service - the latest B-21 and ... B-52!
And much newer and clever B-1 and B-2 will go to the desert for storage.

[Krilovchanin]

You can’t shove a cruise missile into B-1 and B-2, they have bomber bombs for this. And with bombs today you don’t have much to fly on such a colossus, air defense will fall down. B-2 also stands as a half-aircraft carrier. So they refuse them.

[rocket757]

"naphthalene battleship" !!! for what is not, then sho is taken!
the aircraft is flying !!! there are simply no other criteria.

[Chaldon48]

I think this machine had to be painted and sold as much as possible until it completely fell apart.

[aszzz888]

It is added that the use of additional pins will allow for a certain time to overcome the problem of metal fatigue on airplanes,

And paint - everything will be stronger ...

[cniza]

Yeah, at least three layers.

[Victor_B]

Quote: aszzz888

And paint - everything will be stronger ...

And stick to the goat!

[rocket757]

Quote: cniza

Yeah, at least three layers.

Painting, and even in three layers! this is overweight, with its area and other problems .... nothing will strengthen. Although, if the color of the terrain, then you can roll aside and forget forever.

[sgr291158]

They make candy out of shit.

[Ham]

these are the same "museum exhibits" about which some kind of gomik was talking about. from my usa? or others?

[Forest]

These planes are more dangerous for the USS than for the Russian Federation)

[dmitrii1885]

I heard somewhere that the B-52 can just shoot engines in flight during a malfunction. curious, is it true or not. And if so, then as I understand it, this is not such an unforeseen situation. but these are rumors and conjectures.

[gregor6549]

News from the category of "about nothing." When a plane is aged, the extension of its resource is quite common. In different countries, this extension is carried out in different ways. For example, in Australia, the extension of the life of the F111 glider for the time being was provided by the use of spacial adhesives. In the United States, pins are used somewhere, and somewhere glue, welding. and so on technology. Sometimes for these purposes dispossessed aircraft in storage. The Americans have the same mothballed B 52 lined with whole fields in Arizona. So there is nothing unusual in this.

[Sergeantpro]

Quote: AVM

And much more new and sophisticated B-1 and B-2

In fact, the B-1 was generally created for completely different tasks, had a completely different concept and the load on the structure was completely different. Yes, in fact, of all V-1s, only 10% are in flight readiness and there is no sense in them today, because It’s useless to upgrade them to modern weapons, and those that they can carry are no longer relevant in the match with this aircraft. B-2 - in general, a very controversial aircraft, which was adopted by Northrop to feed it so that it would not bend, because with his direct appointment, he coped even worse than B-1, except that he was much newer. Expensive and pointless. As well as, in due time, F-117 - a failed device, but allowed to run in a large number of new technologies. Well, that’s it.

[Monar]

One thing is not clear. Well, the metal is tired. Naturally. At the initial stage - latki and blue electrical tape.
Well, then only change the power frame. Even if only partially. There is no monolith. Cut off (rivet-unwind, what's the technology?) Worn out elements. To new ones.
But here is the problem. How much will it cost? I know that the USA is not a poor country. But with the same SR-71 problems at the end of operation were. NOBODY made spare parts.
I think that with our carcasses strategists the same problems. No wonder. For a long time no one has produced such a level of aircraft. Well, accordingly, all contractors threw their specialized production well if in a warehouse, and not in scrap metal.