YYCFlyer
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Interesting Upper Deck Evacuation Slides - 747-8I

Tue Jan 03, 2012 3:06 am

I found this picture of the new upper deck evacuation slide for the 747-8I.

Very Cool!

http://www.pirepics.com/albums/userp...747-8I_s_New_Escape_Slides_res.jpg
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as739x
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Tue Jan 03, 2012 3:13 am

That is interesting. Almost like a canopy over the top ones.
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tdscanuck
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Tue Jan 03, 2012 3:15 am

Quoting as739x (Reply 1):
Almost like a canopy over the top ones.

I don't think there's anything between the arches (i.e. no actual weather coverage), just the two arches stabilizing the side tubes.

Tom.
 
as739x
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Tue Jan 03, 2012 3:21 am

Quoting tdscanuck (Reply 2):

That make's sense. Hard to tell from the forward angle of the shot.
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vikkyvik
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Tue Jan 03, 2012 3:42 am

Interesting - looks like a tied-arch bridge.

(probably acts like one too)
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FlyboyOz
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Tue Jan 03, 2012 5:36 am

Wow...I have never thought of that new design of the new upper deck evacuation slide. It is useful because it helps to stop the wind blowing out and make a strong structure.

[Edited 2012-01-02 22:04:23]
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nz2
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Tue Jan 03, 2012 5:53 am

Quoting vikkyvik (Reply 4):
Interesting - looks like a tied-arch bridge.

(probably acts like one too)

Totally, thats the reason for the arch to give structural strength like a bridge would
 
gatechae
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Tue Jan 03, 2012 6:07 am

Id love to see them inflate
 
Burj
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Tue Jan 03, 2012 6:09 am

Excellent design change.... Having slides so far up makes them more susceptible to wind. Curious that the A380 upper deck slides don't have/need these arches...
 
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DocLightning
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Tue Jan 03, 2012 6:57 am

But why isn't this present on the 744? The 744's upper deck is just as high above the ground as the 748i's. Why does the 748i need to have a stiffer slide? Surely, the length of the upper deck isn't the issue.
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usxguy
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Tue Jan 03, 2012 7:01 am

... or this could be a design enhancement based on feedback from Boeing 747 users about possible issues with the UD slides.....
xx
 
rikkus67
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Tue Jan 03, 2012 7:04 am

Quoting DocLightning (Reply 9):
But why isn't this present on the 744?

It's an evolutionary design. I imagine there might be a design change in the way these larger styles are stored. If not, they may be available as upgrades for the 744 fleet.
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DocLightning
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Tue Jan 03, 2012 7:06 am

Quoting rikkus67 (Reply 11):
It's an evolutionary design.

That's a lot of weight for all that fabric. Evolutionary design to solve what problem? What was wrong with the 743/4 slides?
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qf002
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Tue Jan 03, 2012 10:04 pm

Quoting DocLightning (Reply 12):
Quoting rikkus67 (Reply 11):
It's an evolutionary design.

That's a lot of weight for all that fabric. Evolutionary design to solve what problem? What was wrong with the 743/4 slides?

There could be a number of problems unique to the 748i:

1. The engines are much bigger and much more powerful -- there may be a need to overcome the additional wind/force if the engines are still running when the slides are deployed.

2. The number of pax evacuating from the upper deck has increased significantly -- perhaps the old slides were not designed to handle higher capacity?

In any case, the new slides might actually save weight. The lower section doesn't need to be as heavy/strong with the arches, and their weight may be lower than the weight of the reinforcement needed to the single slide.
 
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DocLightning
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Tue Jan 03, 2012 10:10 pm

Quoting qf002 (Reply 13):

1. The engines are much bigger and much more powerful -- there may be a need to overcome the additional wind/force if the engines are still running when the slides are deployed.

Under what circumstances would an evacuation be performed on the side of the aircraft with the engines still running? I can't imagine any procedure would allow that. Evacuate only to be sucked through a fan?

Quoting qf002 (Reply 13):
2. The number of pax evacuating from the upper deck has increased significantly -- perhaps the old slides were not designed to handle higher capacity?

The upper deck needs to be clear in 90 seconds. The old upper deck could probably be clear in much less than that. Remember, it is not the overall number of passengers that determines the slide's structure. Rather, it is the number of passengers on the slide at any given moment that determines the strength needed. I don't see how the extension of the upper deck would change the number of passengers down the slide per second.
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seabosdca
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Tue Jan 03, 2012 10:42 pm

Quoting qf002 (Reply 13):
In any case, the new slides might actually save weight. The lower section doesn't need to be as heavy/strong with the arches, and their weight may be lower than the weight of the reinforcement needed to the single slide.

This seems likely to me. Look how much thinner the slide sides are than those on the (shorter but wider) lower-deck slides.

I'd still love to know how much one of these upper-deck slides weighs.
 
TravellerPlus
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Tue Jan 03, 2012 11:16 pm

Quoting DocLightning (Reply 14):
Under what circumstances would an evacuation be performed on the side of the aircraft with the engines still running? I can't imagine any procedure would allow that. Evacuate only to be sucked through a fan?

Accidents don't always follow procedure and engines can remain running after a severe impact. The most sombre example was the Tenerife accident. The KLM 747 hit the Pan Am 747 on the starboard side. The port side was the only useable side, even though the engines could not be shut off as the control cables were severed. The engines eventually oversped and exploded. Tragically the stewardess at the overwing exit was decapitated by shrapnel from an engine as she evacuated passengers.

Video of the Garuda 737 crash in Yogyakarta shows that an engine or APU remained running until fire consumed the aircraft.
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JAAlbert
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Wed Jan 04, 2012 8:20 am

I bet that's quite a ride on that upper evacuation slide! You must build up quite a bit of speed by the time you hit the ground - is there anything that slows a passenger down at the bottom or does everyone on the upper deck crawl away from the slide with broken ankles?

Quoting TravellerPlus (Reply 16):
Accidents don't always follow procedure and engines can remain running after a severe impact.

The Qantas 380 involved in the engine incident in Singapore couldn't shut down one or two of its engines one one side after landing.
 
Burj
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Wed Jan 04, 2012 9:47 am

Quoting JAAlbert (Reply 17):
I bet that's quite a ride on that upper evacuation slide! You must build up quite a bit of speed by the time you hit the ground - is there anything that slows a passenger down at the bottom or does everyone on the upper deck crawl away from the slide with broken ankles?

The actual slide surface that you slide down is not that slick so with the friction against your clothes you hit a "terminal velocity" pretty quickly. This means you don't just keep accelerating all the way down the slide... Not to say it isn't risky to go down those slides, especially if you don't keep your legs in front of you ready to absorb some of the energy when you transition off the slide, but most people will not be breaking their ankles.
 
edina
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Wed Jan 04, 2012 1:06 pm

Quoting burj (Reply 18):
Quoting JAAlbert (Reply 17):I bet that's quite a ride on that upper evacuation slide! You must build up quite a bit of speed by the time you hit the ground - is there anything that slows a passenger down at the bottom or does everyone on the upper deck crawl away from the slide with broken ankles?
The actual slide surface that you slide down is not that slick so with the friction against your clothes you hit a "terminal velocity" pretty quickly. This means you don't just keep accelerating all the way down the slide... Not to say it isn't risky to go down those slides, especially if you don't keep your legs in front of you ready to absorb some of the energy when you transition off the slide, but most people will not be breaking their ankles.

On most evacuation slides you also have very high friction strips (on the average widebody the last 1-1.5 metres) that slow a sliding person right down.....your butt hits these strips & it's like a push up on to your feet enabling a quick getaway from the bottom of the slide.

http://www.securiteaerienne.com/ill/...itish-Airways-288-Evacuation-4.jpg

You can see the square patch at the bottom of the slide on the above BA 744.

[Edited 2012-01-04 05:17:03]
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Burj
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Thu Jan 05, 2012 3:23 am

Quoting edina (Reply 19):
You can see the square patch at the bottom of the slide on the above BA 744.

Oh cool...hadn't seen pictures of these before!
 
VC10er
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Thu Jan 05, 2012 3:38 am

Let's pray they never get used - but i can promise you I will be on that upper deck one day and I like it.

Is this really the first time this type of design has ever been seen? Not on a big military bird either?
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GSPFlyer
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Thu Jan 05, 2012 4:45 am

How can I order one for a third floor dorm room? That would save so much time not having to go down 2 flights of stairs or wait for an elevator.

The arches definitely are there to add stability, much like arched bridges. I'm surprised they wouldn't put some kind of netting down the length of the slide to prevent people from falling off the sides.

[Edited 2012-01-04 20:48:40]
 
quiet1
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Thu Jan 05, 2012 5:34 am

Quoting edina (Reply 19):
On most evacuation slides you also have very high friction strips (on the average widebody the last 1-1.5 metres) that slow a sliding person right down.....your butt hits these strips & it's like a push up on to your feet enabling a quick getaway from the bottom of the slide.

And, a very good reason for women wearing skirts/dresses to wear suitable underwear. Exposed butt flesh can get damaged by those "very high friction strips."

I know of one particular evacuation where a F/A found out the hard way.
 
flightsimer
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Thu Jan 05, 2012 6:17 am

Cool design.

Are the slides "officially" used as life rafts when evacuating in the water? When i think back to 1527, they were used but was that by choice(didnt have any true rafts) or design (in the sense of specifically being a raft in a water crash)? Could t be the arches give a increase in support/capacity when used as a raft?
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quiet1
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Thu Jan 05, 2012 6:32 am

Depends on the airplane. If the airplane is "overwater" approved and has "slide rafts" (as opposed to mere "evacuation slides,") yes, the slides are "officially" used as life rafts when ditching.

Not all slides on overwater aircraft are slide rafts. e.g. On the 747-400/8i, the upper deck and the door 3 slides are not slide rafts. Only doors 1, 2, 4 and 5 are slide rafts.
 
flightsimer
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Thu Jan 05, 2012 6:41 am

Thanks for the info. But do we know for sure this is indeed not a new "slide-Raft"? is there a way to tell them apart?
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quiet1
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RE: Interesting Upper Deck Evacuation Slides - 747-8I

Thu Jan 05, 2012 6:58 am

Based on that picture of the -8i, I doubt the upper deck slides are slide rafts (I know for a fact that the -400's are not).

Look at the relatively narrow size of the main inflation tube and the length of the slide -- doesn't look like a design for stable flotation, even in relatively calm seas. Also, notice at mid-slide the inflated tube cross-wise under the slide -- unless that is easily detachable, it would raise the slide in the water and you'd have a peak in your "raft," no? Ditto for the underslide tube at the base, as well. Would not contribute to a level, stable raft.

The overhead arches, again if not easily detached, would raise the center of gravity and lend to instability.

The slides at the main deck doors 1,2,4 and 5 are double-tube on each side to lend stability the entire length. The upper deck slide only has a (skinny) double tube support on the first (top) half of the slide. The second (bottom) half seems a bit long with no support.

However, it would make a most elegant float in a parade, don't you think?

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