Arcano
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Enough Emergency Exits On 763s?

Tue Apr 17, 2012 12:35 am

Hi everybody, I've had a question since long time ago.

Most 763s have each side 2 main doors and 2 overwing exits, which is very much the same exit configuration of the old good 722s (although they actually had a 5th exit in the rear) or a 320.

How come an aircraft that almost doubles pax capacity may have the same number of emergency exits? It has something to do with the number of aisles and seats per aisle?
Is actually slower to evacuate a 767 than a 727 or a 320?

Thanks and regards

Arcano
in order: 721,146,732,763,722,343,733,320,772,319,752,321,88,83,744,332,100,738, 333, 318, 77W, 78, 773, 380, 73G, 788, 789, 346
 
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fxramper
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RE: Enough Emergency Exits On 763s?

Tue Apr 17, 2012 12:37 am

In a real life emergency there can never be enough exits on an airplane. I saw a video of a simulated evacuation on a widebody and this bloke is crawling over seats to skip up ahead and exit the a/c.   
 
softrally
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RE: Enough Emergency Exits On 763s?

Tue Apr 17, 2012 12:42 am

I've always had the same question. A 757-300 is almost of the same length and actually carries less passengers(350 on 767-300 vs 289 on the 757-300 based on one-class configuration) as it is a narrowbody, but has 10 emergency exits instead of 6 on the 767... That's almost double.
 
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Cubsrule
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RE: Enough Emergency Exits On 763s?

Tue Apr 17, 2012 12:57 am

767 entry doors are double-width, which means double capacity for evacuations. So one side of a 763 has a similar exit throughput to an entire 319.
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quiet1
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RE: Enough Emergency Exits On 763s?

Tue Apr 17, 2012 1:59 am

Quoting Cubsrule (Reply 3):
767 entry doors are double-width...

...and just as importantly, have double-width slides/slide-rafts.
 
Arcano
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RE: Enough Emergency Exits On 763s?

Tue Apr 17, 2012 2:04 am

Quoting Cubsrule (Reply 3):
767 entry doors are double-width, which means double capacity for evacuations.

In theory yes, but note the aisles which lead to the exit are not wider, so not necessarily will me faster evacuation, besides you have to walk longer distance inside the cabin...

Quoting fxramper (Reply 1):
In a real life emergency there can never be enough exits on an airplane. I saw a video of a simulated evacuation on a widebody and this bloke is crawling over seats to skip up ahead and exit the a/c.

Great point...

On the other hand, the exist are more concentrated than other widebodies; 777s and 340s have exits across the fuselage well distributed, while 767 concentrates them in the extremes and center

[Edited 2012-04-16 19:07:07]
in order: 721,146,732,763,722,343,733,320,772,319,752,321,88,83,744,332,100,738, 333, 318, 77W, 78, 773, 380, 73G, 788, 789, 346
 
JQflightie
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RE: Enough Emergency Exits On 763s?

Tue Apr 17, 2012 2:07 am

your forgetting that there are actually or were many variations of exits on the 767-300
for instance.. at QF we have 2 different 767-300's. GE's and RR's
GE - Dual Lane Slide Rafts at Left/Right 1 and Left/Right 2 also dual lane overwing exits (cannot be use in ditching)
RR- Dual Lane Slide Rafts at Left/Right 1, 2 and 4, Single Lane Slide (not raft and cannot be used in Ditching) at doors 3.

Ansett Australia had a interesting combo of doors/exits.
Dual Lane Slide Rafts at Left/Right 1, 2 and 4 and then a single overwing slide.
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LRGT
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RE: Enough Emergency Exits On 763s?

Tue Apr 17, 2012 2:34 am

Technically, the 767 gets more credit for the rear doors also being Type-A size like the front. You get 110 passengers for each set, so that's 220 right there before the overwings.

You get an additional 35 pax for each set of overwings type III door, so maximum pax is 255 with 1, 290 with 2 overwings. That's plenty capacity for most operators with no mid cabin type A doors, although some have them too.

The 737/757 has a lot more exit capacity verses # of pax.
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tdscanuck
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RE: Enough Emergency Exits On 763s?

Tue Apr 17, 2012 3:11 am

Quoting Arcano (Reply 5):
Quoting Cubsrule (Reply 3):
767 entry doors are double-width, which means double capacity for evacuations.

In theory yes, but note the aisles which lead to the exit are not wider, so not necessarily will me faster evacuation, besides you have to walk longer distance inside the cabin...

But you have two aisles (and cross-aisles)...no matter how you slice it, it's got twice the evacuation capacity for less than twice the people.

Tom.
 
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Starlionblue
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RE: Enough Emergency Exits On 763s?

Tue Apr 17, 2012 11:10 am

Quoting Arcano (Reply 5):
Quoting Cubsrule (Reply 3):
767 entry doors are double-width, which means double capacity for evacuations.

In theory yes, but note the aisles which lead to the exit are not wider, so not necessarily will me faster evacuation, besides you have to walk longer distance inside the cabin...

As Tom mentions, a 767 has two aisles, galleys that cross between them and so forth. Way more room for people to push and shove each other to the exits.

I'm no expert but I think because of this on the 757 the issue is getting people to the exits, which on the 767 you could saturate them. But that's just a theory.

Quoting fxramper (Reply 1):
I saw a video of a simulated evacuation on a widebody and this bloke is crawling over seats to skip up ahead and exit the a/c.  

That would certainly be my backup plan.
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mandala499
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RE: Enough Emergency Exits On 763s?

Tue Apr 17, 2012 11:34 am

Quoting Arcano (Reply 5):
In theory yes, but note the aisles which lead to the exit are not wider, so not necessarily will me faster evacuation, besides you have to walk longer distance inside the cabin...

But you got two aisles on the widebody. Each aisle and door on a 767 equate to an aisle and two doors on each side of the aisle on a narrowbody.

Look, as long as you can evacuate the whole aircraft in 90 seconds using only 1/2 the available exits... you're OK 

Mandala499
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Starlionblue
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RE: Enough Emergency Exits On 763s?

Tue Apr 17, 2012 11:37 am

Quoting mandala499 (Reply 10):
Look, as long as you can evacuate the whole aircraft in 90 seconds using only 1/2 the available exits... you're OK 

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