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Boeing 757 Integral Airstairs  
User currently offlineCancidas From Poland, joined Jul 2003, 4112 posts, RR: 11
Posted (8 years 5 months 3 weeks 1 day 13 hours ago) and read 12611 times:

as seen in these photos:


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Photo © Marc Fulton



when the 757 was still in production, was it still available with the in tegral airstairs or was it an after-market option? i know that on the 737 it was available from boeing directly. also, where is it stored? it's not under the L1 door as on the 737 but looks like it is installed inside the airplane. anybody have any info on this?


"...cannot the kingdom of salvation take me home."
36 replies: All unread, showing first 25:
 
User currently offlineTristarSteve From Sweden, joined Nov 2005, 4022 posts, RR: 33
Reply 1, posted (8 years 5 months 3 weeks 1 day 12 hours ago) and read 12602 times:

Sorry, I have worked on B757 since 1987 and never seen airstairs before!
Sure is not a boeing option, but some after market mod.


User currently offlineJetjack74 From United States of America, joined Jul 2003, 7414 posts, RR: 50
Reply 2, posted (8 years 5 months 3 weeks 1 day 11 hours ago) and read 12589 times:
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These are the same airstairs installed on the Navy's C40's. They are very bad, and don't work very well when the temperature drops below 40 degrees. They seize in the middle of retracting. When they do work, the fold up inside the dorrway, and slide on tracks into a crawlspace to the side of the door area.



Made from jets!
User currently offlineCancidas From Poland, joined Jul 2003, 4112 posts, RR: 11
Reply 3, posted (8 years 5 months 3 weeks 1 day 8 hours ago) and read 12542 times:

jetjack, are you referring to the fwd or aft stairs on the c-40? i thought that the fwd ones do not fold but just retract into the fuselage...


"...cannot the kingdom of salvation take me home."
User currently offlineWilax From United States of America, joined Jun 2002, 465 posts, RR: 3
Reply 4, posted (8 years 5 months 3 weeks 1 day 1 hour ago) and read 12447 times:

****Amateur Opinion Warning****

It looks to me that the stairs on the above 757 in the second photo are an addon which folds 4 times at the visible joints and stows just inside the main entry door. They are probably only carried there when they will be needed. I don't see where they could slide inside the fuselage under the floor like the 737. It also looks like there would have to be some type of motor that articulates the stairs because that setup looks quite heavy for a person to operate.


User currently offlineJetjack74 From United States of America, joined Jul 2003, 7414 posts, RR: 50
Reply 5, posted (8 years 5 months 3 weeks 1 day ago) and read 12433 times:
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Quoting Cancidas (Reply 3):
jetjack, are you referring to the fwd or aft stairs on the c-40? i thought that the fwd ones do not fold but just retract into the fuselage...

I'm referring to the Door 2L. It's a and add-on airstair. It slides out on tracks, in-front of the door(folded up-right from the crawl-space), you lock it down with floor-anchors which activate the electric power to the stairs, you extend them by pressing a button that extends the stairs down to the deck.

Quoting Wilax (Reply 4):
It looks to me that the stairs on the above 757 in the second photo are an addon which folds 4 times at the visible joints and stows just inside the main entry door

That's the crawlspace i'm referring to.



Made from jets!
User currently offlineLTU932 From Germany, joined Jan 2006, 13864 posts, RR: 50
Reply 6, posted (8 years 5 months 3 weeks 21 hours ago) and read 12405 times:

Quoting Cancidas (Thread starter):
it's not under the L1 door as on the 737 but looks like it is installed inside the airplane. anybody have any info on this?

Actually on the pictures you showed, the airstars are installed below the L1 door.


User currently offlineSpeedmarque From United Kingdom, joined Jul 2005, 684 posts, RR: 1
Reply 7, posted (8 years 5 months 3 weeks 14 hours ago) and read 12361 times:

Quoting LTU932 (Reply 6):
Actually on the pictures you showed, the airstars are installed below the L1 door.

No. they are coming from the floor/girt area and not from the small hatch below the door as on some 737s


User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 8, posted (8 years 5 months 2 weeks 6 days 9 hours ago) and read 12225 times:

The B757s were never built with Integral Air Stair.This looks like a Customer Add-on.
regds
MEL



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User currently offlineLTU932 From Germany, joined Jan 2006, 13864 posts, RR: 50
Reply 9, posted (8 years 5 months 2 weeks 6 days 3 hours ago) and read 12193 times:

Quoting Speedmarque (Reply 7):
No. they are coming from the floor/girt area

That's what I meant by below the L1.  Wink I was just using a more general term.


User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 10, posted (7 years 3 months 1 week 3 days 19 hours ago) and read 11691 times:

Is there a manufacturers link for these Air Stairs available.Also Is the operating sequence similiar to the Airstair on a B737.
regds
MEL



Think of the brighter side!
User currently offlineZANL188 From United States of America, joined exactly 8 years ago today! , 3546 posts, RR: 0
Reply 11, posted (7 years 3 months 1 week 3 days 14 hours ago) and read 11644 times:
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Quoting HAWK21M (Reply 10):
Is there a manufacturers link for these Air Stairs available.Also Is the operating sequence similiar to the Airstair on a B737.

Wow Mel you've mined another oldie but goodie from the tech/ops archive... Now if you could find some ??? that'd be something!!  Smile

What I'm curious about on jets with these airstairs is this: How do the crews close them up for overnight/longterm parking? Can the doors be closed with the stairs extended? That seems unlikely if they are stored in the cabin... I'm guessing there is a hellhole in one of the pits or gear bays that a person could use to exit the aircraft after retracting the stairs and closing the main deck door.



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User currently offlineBoeingFixer From Canada, joined Jul 2005, 534 posts, RR: 0
Reply 12, posted (7 years 3 months 1 week 3 days 13 hours ago) and read 11624 times:

Quoting ZANL188 (Reply 11):
What I'm curious about on jets with these airstairs is this: How do the crews close them up for overnight/longterm parking? Can the doors be closed with the stairs extended? That seems unlikely if they are stored in the cabin... I'm guessing there is a hellhole in one of the pits or gear bays that a person could use to exit the aircraft after retracting the stairs and closing the main deck door.

Use a belt loader for the last person off the aircraft from another door.

Cheers,

John



Cheers, John YYC
User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 13, posted (7 years 3 months 1 week 3 days 12 hours ago) and read 11612 times:

Quoting ZANL188 (Reply 11):
Can the doors be closed with the stairs extended? That seems unlikely if they are stored in the cabin... I'm guessing there is a hellhole in one of the pits or gear bays that a person could use to exit the aircraft after retracting the stairs and closing the main deck door.

On the B737 Airstair was stored below the Entry door sealed by a seperate door.The Airstair could be opened from Inside & Outside the Aircraft thru an AC or DC [Hot bus] powersupply.
But the B757 Air stair looks different.

regds
MEL



Think of the brighter side!
User currently offlineZANL188 From United States of America, joined exactly 8 years ago today! , 3546 posts, RR: 0
Reply 14, posted (7 years 3 months 1 week 3 days 12 hours ago) and read 11595 times:
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Quoting BoeingFixer (Reply 12):
Use a belt loader for the last person off the aircraft from another door.

Pointless if the idea is to reduce the aircrafts dependence on ground support equipment....



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User currently offlineBoeingFixer From Canada, joined Jul 2005, 534 posts, RR: 0
Reply 15, posted (7 years 3 months 1 week 3 days 11 hours ago) and read 11575 times:

Quoting ZANL188 (Reply 14):
Quoting BoeingFixer (Reply 12):
Use a belt loader for the last person off the aircraft from another door.



Quoting ZANL188 (Reply 14):
Pointless if the idea is to reduce the aircrafts dependence on ground support equipment....

Heavy emphasis on REDUCE in your comment, not eliminate.

Although you may think it's pointless, have you ever tried loading/unloading 757 belly pits without a belt loader? The first picture indicates that one is required and most airports will have one despite not having Airstairs.

Other options include lift trucks, lift platforms, ladder in the back of a truck etc.... to get the last crew member off. Lots of ways you can do it.

The main reason to have those retractable Airstairs is for passenger comfort/safety when real Airstairs are not available.

Cheers,

John



Cheers, John YYC
User currently offlineZANL188 From United States of America, joined exactly 8 years ago today! , 3546 posts, RR: 0
Reply 16, posted (7 years 3 months 1 week 3 days 7 hours ago) and read 11516 times:
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Quoting BoeingFixer (Reply 15):
Although you may think it's pointless, have you ever tried loading/unloading 757 belly pits without a belt loader?

Yep -- Straight to or from the back of a truck. Done the same with all the widebodies too...

Quoting BoeingFixer (Reply 15):
The first picture indicates that one is required and most airports will have one despite not having Airstairs.

My experience has been rather the opposite... i.e. if an airport has any ground support equipment it will have stairs and not loaders... but to each his own



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User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 17, posted (7 years 3 months 1 week 3 days 2 hours ago) and read 11482 times:

Quoting ZANL188 (Reply 14):
Pointless if the idea is to reduce the aircrafts dependence on ground support equipment....

Not if the unit is used by a trained person who folds the Air stair after the Pax are off it.
Makes sense.
regds
MEL



Think of the brighter side!
User currently offlineZANL188 From United States of America, joined exactly 8 years ago today! , 3546 posts, RR: 0
Reply 18, posted (7 years 3 months 1 week 2 days 13 hours ago) and read 11404 times:
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Quoting HAWK21M (Reply 17):
Not if the unit is used by a trained person who folds the Air stair after the Pax are off it.
Makes sense.

Makes sense only if the person has a way to get off the aircraft. If the airstair folds up and is then stowed in the cabin, one person cannot do that task and operate the belt loader (assuming there is one). I suppose you could do it the long way around, run the loader up to another door, raise the belt, cut off the loader, open the 2nd door, fold/stow the stair, and then reverse the process with the belt loader (again assuming there's a belt loader handy). Doesn't seem likely or practical....

Which brings me back to my question... hows does the person folding/stowing the stairs get off the jet?



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User currently offlineViscount724 From Switzerland, joined Oct 2006, 25626 posts, RR: 22
Reply 19, posted (7 years 3 months 1 week 2 days 10 hours ago) and read 11373 times:

Quoting HAWK21M (Reply 13):
On the B737 Airstair was stored below the Entry door sealed by a seperate door.The Airstair could be opened from Inside & Outside the Aircraft thru an AC or DC [Hot bus] powersupply.

737-200C Combis with main deck cargo door have a rear airstair attached to the door which opens downward rather than outward. Aircraft in photos also have the optional equipment for use on gravel runways.


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User currently offlineCancidas From Poland, joined Jul 2003, 4112 posts, RR: 11
Reply 20, posted (7 years 3 months 1 week 2 days 10 hours ago) and read 11371 times:

aside from a separate set of stairs there really is no way to fold those stairs from the inside then get off. it's not like they fold under the L1 door, they're inside the airplane. it doesn't appear that they can even close the door with those stairs on. does anyone know who manufactures the stairs? i'm at work now and searching capabilities are severly restrcited here.


"...cannot the kingdom of salvation take me home."
User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 21, posted (7 years 3 months 1 week 2 days 9 hours ago) and read 11338 times:

Quoting ZANL188 (Reply 18):
hows does the person folding/stowing the stairs get off the jet

Ever heard of a Mx Trestle  Smile

Quoting Viscount724 (Reply 19):
737-200C Combis with main deck cargo door have a rear airstair attached to the door which opens downward rather than outward. Aircraft in photos also have the optional equipment for use on gravel runways

Rear Airstair was also used on some early B732s,not only B732Cs.
regds
MEL



Think of the brighter side!
User currently offlineSv2008 From United Kingdom, joined Aug 2006, 622 posts, RR: 0
Reply 22, posted (7 years 3 months 1 week 2 days 9 hours ago) and read 11335 times:

Quoting Viscount724 (Reply 19):
Aircraft in photos also have the optional equipment for use on gravel runways.

How does a 737 take off from a gravel runway??? I heard of this before, but just can't picture it. why would any airport build such a long runway (that a jet could take off on) but not out of asphalt? Wouldn't the engines and the weight of the aircraft disturb the surface? Wouldn't it tend to sink into it? Wouldn't the engines be damaged by flying stones?


User currently offlineAirfoilsguy From , joined Dec 1969, posts, RR:
Reply 23, posted (7 years 3 months 1 week 2 days 9 hours ago) and read 11333 times:

On the left photo it doesn't look like the stares fold into the door. From what I can tell the stairs are stored in the cargo compartment on a pallet. The pallet is unloaded using the belt loader and put on a cart. (the cart is parked right in front of the nose landing gear). Someone on the ground somehow assembles the stairs and hooks them up to the door. Who does what in my above scenario is a mystery to me.

User currently offlineAirfoilsguy From , joined Dec 1969, posts, RR:
Reply 24, posted (7 years 3 months 1 week 2 days 9 hours ago) and read 11328 times:

Quoting Sv2008 (Reply 22):
How does a 737 take off from a gravel runway???

The nose gear has a special plate or mud flap the keeps the rocks down. The engines have a pipe like nozzle just under the intake that helps keep the gravel from being sucked into the engines.

Quoting Sv2008 (Reply 22):
why would any airport build such a long runway (that a jet could take off on) but not out of asphalt?

A lot cheaper to have an unpaved runway.


25 Cancidas : that kind of defeats the purpose of having them installed on the airplane. if someone has to pull them out of the belly and then hoist them up to the
26 Post contains links and images Viscount724 : Gravel runways used by 737s are very solid. They just don't have a paved surface. I've flown on 737-200Cs with the gravel runway kits to a couple of
27 Post contains links and images HAWK21M : These were during the days when there was need to operate to non paved runway airports too. The Gravel deflector on the NLG door & the Gravel deflect
28 DeltaGuy : Nice Jax Sunseekers bird there Jack.....can't say they haven't tried to kill me in the pattern over at NAS a time or two.... IIRC the airstairs was a
29 Post contains images HAWK21M : True.Quite a foldable contraption.Caution is no safety sequence switches in Stby mode.So got to ensure the Hand Rails are stored prior to Retraction
30 SkydrolBoy : The airstairs are an aftermarket option for the 757, they fold up into the cabin of the aircraft then slide sideways into the wardrobe just aft of the
31 HAWK21M : Interesting.Whose Aircraft are these.Also where does the ladder store in the MEC. regds MEL
32 Post contains images Flynavy : Here's another picture I took of a Navy C-40A's airstairs:
33 SkydrolBoy : The Dallas Mavericks and Vulcan Aviations a/c are the ones I've worked on with the stairs. The ladder is attached to a winch and it is bolted to the
34 HAWK21M : How is it sliding locked in place as the MEC door opens Inner & Left. regds MEL
35 Cancidas : another question. the stairs that are installed on the above 757s, could they be installed on a 767?
36 Edina : Looks very similar to the airstairs on the BAe 146 which also slide on a track into the doorway.
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