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Those are old birds.... (Read 91 times)
raydawg
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Those are old birds....
04/16/18 at 14:42:04
 
However, age is not the biggest factor, cycles are.
A cycle is every pressurization the plane experiences from the runway, altitude, and back down.
It puts a tremendous strain on the aircraft.

http://money.cnn.com/2018/04/16/news/companies/allegiant-air-safety-record/in...
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verslagen1
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Re: Those are old birds....
Reply #1 - 04/16/18 at 15:33:26
 
Remember the Connie with those square cornered windows!

One has to wonder why ships have round windows.
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raydawg
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Re: Those are old birds....
Reply #2 - 04/16/18 at 18:59:58
 
verslagen1 wrote on 04/16/18 at 15:33:26:
Remember the Connie with those square cornered windows!

One has to wonder why ships have round windows.


Remember I mentioned stress, that is why.
Round/oval allows a more even distribution of support.
The Connie had planes just disappear in flight.
They traced in back to the corner in the windows cracking the fuselage.
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Re: Those are old birds....
Reply #3 - 04/16/18 at 19:35:35
 

It was the loss of several de Havilland Comets that taught us why windows needed to be round.

https://www.sciencealert.com/watch-there-s-a-scientific-reason-for-why-aeropl...

Even so, KLM has some early model 747s exceeding 140,000 hrs and well beyond 17,000 cycles. Those Allegiant birds are mere youngsters.
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verslagen1
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Re: Those are old birds....
Reply #4 - 04/16/18 at 20:52:35
 
That's right Comets, the 1st jet airliners.
Thanks, CRS.
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Re: Those are old birds....
Reply #5 - 04/17/18 at 11:25:14
 
I've watched my aircraft during maintenance where the mechanics pressurized them on the ground. A little unnerving to see the fuselage change shape and the windows bulge outward. My butt was in those during Flight! However, I only twice experienced an explosive decompression in 40 years and 17000 plus hours. Modern aircraft are pretty reliable. My failures were both due to mechanics failing to tighten a fitting properly. :'( Not an actual failure of the systems.
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Re: Those are old birds....
Reply #6 - 04/17/18 at 11:46:30
 
Yeah, itís oretty amazing what they do with aircraft.
The 787 is so redundant, I think it really will only fail with pilot error.
I will guess itís approx 40% over built/engineered.
It would take a series of failures to bring it down.
The PSI is high, for its hydraulics, to cut down on weight, etc....
At 5000 lbs, I was always extremely cautious when I tested my plumbing  Grin
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verslagen1
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Re: Those are old birds....
Reply #7 - 04/17/18 at 12:01:20
 
I took a course for MIL-Q-9858 and the instructor was one of the original writers... He had some stories to tell.
One of them was when they tested the wings on the 747, folded them back till they practically touched.
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raydawg
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Re: Those are old birds....
Reply #8 - 04/17/18 at 12:04:30
 
Oh no..,,,

http://www.foxnews.com/us/2018/04/17/southwest-airlines-planes-engine-explode...

I work on the plane.
The picture shows what look likes the turbines broke, why, I donít know.
He was cruising at this point, low thrust.
That is not near the combustion chamber.

Scary for sure, but it landed.
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raydawg
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Re: Those are old birds....
Reply #9 - 04/17/18 at 12:06:24
 
verslagen1 wrote on 04/17/18 at 12:01:20:
I took a course for MIL-Q-9858 and the instructor was one of the original writers... He had some stories to tell.
One of them was when they tested the wings on the 747, folded them back till they practically touched.



That would be the 787, not the original 747 wing.
However, they did go to composite years later.
I have a picture of that test, it is amazing.
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Re: Those are old birds....
Reply #10 - 04/17/18 at 12:36:19
 
norm92de wrote on 04/17/18 at 11:25:14:
I've watched my aircraft during maintenance where the mechanics pressurized them on the ground. A little unnerving to see the fuselage change shape and the windows bulge outward. My butt was in those during Flight! However, I only twice experienced an explosive decompression in 40 years and 17000 plus hours. Modern aircraft are pretty reliable. My failures were both due to mechanics failing to tighten a fitting properly. :'( Not an actual failure of the systems.



17,000 hours ?
Piloting or other crew ?

So can you breathe normally at sea level ?  😆
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Re: Those are old birds....
Reply #11 - 04/17/18 at 13:14:38
 
!7500 hours actually as a pilot for 40 plus years depending on when you start counting. I only counted years of professional flying.
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verslagen1
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Re: Those are old birds....
Reply #12 - 04/17/18 at 14:39:33
 
raydawg wrote on 04/17/18 at 12:06:24:
verslagen1 wrote on 04/17/18 at 12:01:20:
I took a course for MIL-Q-9858 and the instructor was one of the original writers... He had some stories to tell.
One of them was when they tested the wings on the 747, folded them back till they practically touched.



That would be the 787, not the original 747 wing.
However, they did go to composite years later.
I have a picture of that test, it is amazing.


When I took the course... 787 wasn't even a dream.  It was the 747, I'm sure of it.
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raydawg
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Re: Those are old birds....
Reply #13 - 04/17/18 at 17:43:20
 
Ok, not aware of that.
Just talked to a buddy of mine who we worked together for many years...
He is being moved to the new Air Force 1, which is on the platform.
Not enough to make me stay on 🤪
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