mikey72
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Why No Double Lane Slide On The 748 Cargo U/Deck?

Sat Dec 17, 2011 2:16 pm

I know they don't need a double-lane slide to evacuate many people on a cargo aircraft but if there were an emergency it's still a hell of a long way to the ground from the upper deck of a 747-800 on a single-lane slide.

Especially if it's windy.

  

Is the roof hatch the primary mode of escape ?
Flying is like sex - I've never had all I wanted but occasionally I've had all I can stand.
 
tdscanuck
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RE: Why No Double Lane Slide On The 748 Cargo U/Deck?

Sat Dec 17, 2011 4:12 pm

Quoting mikey72 (Thread starter):
if there were an emergency it's still a hell of a long way to the ground from the upper deck of a 747-800 on a single-lane slide.

It's the same distance down whether you have a dual or single lane slide. Why pack the extra weight of a dual-lane when you're not even close to needing that capacity? Also, the upper deck door is narrow...I'm not sure you'd gain much from widening the slide.

Quoting mikey72 (Thread starter):
Is the roof hatch the primary mode of escape ?

I'd rather take my chances on the slide than with a descent reel from that height.

Tom.
 
PGNCS
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RE: Why No Double Lane Slide On The 748 Cargo U/Deck?

Sat Dec 17, 2011 9:29 pm

Quoting tdscanuck (Reply 1):
Quoting mikey72 (Thread starter):
Is the roof hatch the primary mode of escape ?

I'd rather take my chances on the slide than with a descent reel from that height.

Oh no doubt! When I flew the 744 it was made clear that the hatch was a last chance to live option.
 
KAUSpilot
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RE: Why No Double Lane Slide On The 748 Cargo U/Deck?

Sun Dec 18, 2011 12:44 am

The escape routes would go like this, with 1 being the least urgent and 4 being the most urgent/abnormal, assuming no ground equipment available:

1. Ladder from the E/E compartment
2. Escape rope from the L1 or L5 main deck door
3. Upper deck emergency slide
4. Overhead escape hatch/inertial reels.
 
AA737-823
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RE: Why No Double Lane Slide On The 748 Cargo U/Deck?

Mon Dec 26, 2011 4:42 am

Quoting PGNCS (Reply 2):
Oh no doubt! When I flew the 744 it was made clear that the hatch was a last chance to live option.

Aah, but have you seen the vintage TWA video where use of the escape hatch is demonstrated? That inertia reel virtually lets the poor slob FREEFALL until the last, oh, six inches. And it doesn't even reach the ground! You have to jump the rest of the way! Just a few feet, but gosh...

It's on youtube somewhere. I'll see if I can find it later.


To the original question, there's no point. The upper deck of a freighter is going to seat about twenty people tops, which can easily be evacuated down a single-lane in about 25 seconds if they're under sufficient coersion.
 
MD-90
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RE: Why No Double Lane Slide On The 748 Cargo U/Deck?

Mon Dec 26, 2011 2:08 pm

Quoting KAUSpilot (Reply 3):
2. Escape rope from the L1 or L5 main deck door

How does that work? Do you basically have a rope attached to the door frame and you manually lower yourself down?
 
tdscanuck
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RE: Why No Double Lane Slide On The 748 Cargo U/Deck?

Mon Dec 26, 2011 4:17 pm

Quoting MD-90 (Reply 5):
Quoting KAUSpilot (Reply 3):
2. Escape rope from the L1 or L5 main deck door

How does that work? Do you basically have a rope attached to the door frame and you manually lower yourself down?

Yep. It's usually in a bag or compartment just beside the door. One end is already secured to a sturdy point on the frame and the rope has some combination of bumps/knots/bulges/etc. every foot or so you can lower yourself in a semi-controlled manner.

Tom.
 
mikey72
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RE: Why No Double Lane Slide On The 748 Cargo U/Deck?

Wed Dec 28, 2011 7:15 am

Quoting AA737-823 (Reply 4):
if they're under sufficient coersion.

Lol - they'd have to be. I think I'd rather take my chances with the hatch if it was a windy day !
Flying is like sex - I've never had all I wanted but occasionally I've had all I can stand.
 
737tdi
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RE: Why No Double Lane Slide On The 748 Cargo U/Deck?

Wed Dec 28, 2011 8:25 am

We use those inertia reels everyday at work due to OSHA regs. and I can tell you it is a pain in the butt. I can tell you though they will slow/interupt your fall. They are actually very cool. I had a chance to test them and they work quite well.

737tdi
 
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Zkpilot
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RE: Why No Double Lane Slide On The 748 Cargo U/Deck?

Wed Dec 28, 2011 11:56 am

Of course besides a hijacking (not so likely on a freighter), the only time descent reels are likely to be needed is from an actual crash (where access to a slide is not available for some reason). In this case the height is almost certainly going to be less (nose wheel almost always is the first to go) so that reduces the height by about 3 metres (still a big drop).
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HAWK21M
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RE: Why No Double Lane Slide On The 748 Cargo U/Deck?

Mon Jan 02, 2012 6:08 am

Quoting tdscanuck (Reply 6):

Yep. It's usually in a bag or compartment just beside the door. One end is already secured to a sturdy point on the frame and the rope has some combination of bumps/knots/bulges/etc. every foot or so you can lower yourself in a semi-controlled manner.

What about those spring loaded reels.
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tdscanuck
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RE: Why No Double Lane Slide On The 748 Cargo U/Deck?

Mon Jan 02, 2012 5:07 pm

Quoting HAWK21M (Reply 10):
What about those spring loaded reels.

Those are in a compartment in the flight deck with one end fastened to the structure. You grab the handle (integral with the inertia reel) and go out the hatch. They can be used for main deck doors as well but that's not that common in line service as far as I know.

Tom.
 
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HAWK21M
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RE: Why No Double Lane Slide On The 748 Cargo U/Deck?

Tue Jan 03, 2012 7:59 am

Quoting tdscanuck (Reply 11):

Those are in a compartment in the flight deck with one end fastened to the structure. You grab the handle (integral with the inertia reel) and go out the hatch. They can be used for main deck doors as well but that's not that common in line service as far as I know.

Exactly...What Im saying is the Inertia reels is more easier to descend via rather than knotted rope....
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