c172heavy
Posts: 105
Joined: Sat Aug 07, 2004 9:39 am

What's Under The Door?

Wed Oct 04, 2006 11:11 pm

So what is this? I thought this was where the slides were stowed, but it appears to be a folding ladder, no?


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"How's that working out for ya?....Bein' clever?"
 
concorde01
Posts: 21
Joined: Sun Jun 18, 2006 6:29 am

RE: What's Under The Door?

Wed Oct 04, 2006 11:14 pm

yes it is a folding ladder. the aircraft is equipped with them so they don't have to wait for stairs to be driven next to the door
 
CHRISBA777ER
Posts: 3715
Joined: Thu Mar 01, 2001 12:12 pm

RE: What's Under The Door?

Wed Oct 04, 2006 11:15 pm

Yes it is - most of the FR 737s have them - means lower airport fees if you dont need a jetway or airstairs.
What do you mean you dont have any bourbon? Do you know how far it is to Houston? What kind of airline is this???
 
mcdu
Posts: 906
Joined: Thu Apr 28, 2005 5:23 am

RE: What's Under The Door?

Wed Oct 04, 2006 11:25 pm

The escape slide is visible in this photograph. It is covered by the large platic cover with the circle on it, directly below the door handle. The circle is the PSI gauge that is verfied to be in the green band by the F/A's before dept. The original 737's-100's and 200's came with the airstairs as a standard feature. Not a tremendous amount of jet bridges in the 60's. Once the terminals matured, the airlines removed the airstairs to save weight. You will see a few old 737's running around with a door where the stairs should be but there is nothing in there. Boeing obviously kept the design as an option for those carriers that operate from hardstands more often than not and it appears Ryan is one of them. Personally I liked having stairs as an option. We used to have them on the 737-200's and all of the 727's had aft airstairs. It made a diversion easier as you had a means of easily getting off the airplane to do a walkaround or talk to the fueler.

The gray material that is hanging below the door is the attach mechanism "girt bar". This bar is placed into the floor attach points after the doors are closed, manually on these airplanes, by the crew and that is what the F/A's are doing when you hear "arm doors for departure" announcement in the cabin.

The manual girt bar disappeared after in the 757/767 series were produced but to make sure that SWA can train their trolly dollys to do things one way only they retained this set up on the 737NG's. It is a shame that Boeing did not adopt more improvements in the NG's but SWA throughs a ton of weight around. The airbus and 777 doors (which is a copy of the bus) are superior designs in my opinon but I only open them every nine months in training.
 
c172heavy
Posts: 105
Joined: Sat Aug 07, 2004 9:39 am

RE: What's Under The Door?

Thu Oct 05, 2006 12:21 am

Thanks for the verification. That leads me to ask, can the stairs be deployed from inside the aircraft?
"How's that working out for ya?....Bein' clever?"
 
c172heavy
Posts: 105
Joined: Sat Aug 07, 2004 9:39 am

RE: What's Under The Door?

Thu Oct 05, 2006 12:25 am

Just checked that photo out again....I suppose the crew person was stowing them as the picture was taken, eh?
"How's that working out for ya?....Bein' clever?"
 
bwaflyer
Posts: 496
Joined: Sat Jun 05, 2004 12:48 am

RE: What's Under The Door?

Thu Oct 05, 2006 1:31 am

Before the airstairs were removed on our 737-300s to save weight, we used them at most of the airports we flew to. If the groundstaff only had one set of mobile steps available, we could have them attached to the rear door, and speed up embarkation / disembarkation. On the 737 classics, the stairs are operated by a toggle switch in the ceiling above the door. On the 737 NG, the switch is fitted to the cabin crew panel above the jump seat - you can see the cabin crew member pushing the button in the picture. Our procedure was to crack the door open (turn the operating handle (the big silver handle on the door) and door opens inside the aircraft). We would then operate the stairs so they were fully extended. We'd the push the door open fully, and unfold the hand rails which extended upwards and clip into mounting points inside the door frame. The operation was reversed to close the door. We'd never operate the stairs with the door fully open to avoid accidental falls. The airstairs can also be operated externally via a handle on the bottom of the fuselage. I assume it's in the same location on the NG's which would be under the white sticker in the picture, just aft of the red line painted underneath the door. The stairs can be operated in standby mode when there is no power to the aircraft by drawing power from the batteries
 
bwaflyer
Posts: 496
Joined: Sat Jun 05, 2004 12:48 am

RE: What's Under The Door?

Thu Oct 05, 2006 4:08 am

By the way - pretty much every western aircraft if fitted with slides has them attached to the inside of the door. Two notable exceptions to this are the A321 (2nd and 3rd set of doors) and the upper deck doors on the A380 which have the slides in a compartment underneath the door, and is deployed through an opening in the fuselage - as in the photo below.


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There's a video somewhere showing a Turkish Airlines A321 deploying the slide during maintenance.
 
Gr8Circle
Posts: 2397
Joined: Fri Dec 02, 2005 11:44 am

RE: What's Under The Door?

Thu Oct 05, 2006 5:56 am

Quoting Concorde01 (Reply 1):
yes it is a folding ladder. the aircraft is equipped with them so they don't have to wait for stairs to be driven next to the door

Anyone have a pic of the ladded fully extended out and in use....?  smile 
 
LVICS
Posts: 63
Joined: Mon Aug 14, 2006 10:45 pm

RE: What's Under The Door?

Thu Oct 05, 2006 7:05 am

Here you go

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Photo © Ricardo Lin
View Large View Medium
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Photo © Ricardo Lin



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Photo © Ricardo Lin

 
legoguy
Posts: 2972
Joined: Tue Jun 13, 2006 8:59 pm

RE: What's Under The Door?

Thu Oct 05, 2006 8:00 am

If some airlines prefer not to use airport air stairs due to costs and time, does the weight of the actual stairs onboard the aircraft add extra weight meaning additional fuel costs?

I would presume that it must be cheap to carry the stairs rather than using a set of airport air stairs?
Can you say 'Beer Can' without sounding like a Jamaican saying 'Bacon'?
 
lovinitflyboy
Posts: 112
Joined: Sun Feb 19, 2006 9:22 pm

RE: What's Under The Door?

Thu Oct 05, 2006 8:10 am

Quoting Bwaflyer (Reply 7):
By the way - pretty much every western aircraft if fitted with slides has them attached to the inside of the door. Two notable exceptions to this are the A321 (2nd and 3rd set of doors) and the upper deck doors on the A380 which have the slides in a compartment underneath the door, and is deployed through an opening in the fuselage

A330, doors 3 are the same as doors 2 and 3 on thr A321, the compartment underneath the door, opens and deploys the slide, possably the same on the A340 doors 3?
 
COERJ145
Posts: 1140
Joined: Mon Jun 27, 2005 7:22 am

RE: What's Under The Door?

Thu Oct 05, 2006 8:14 am

Quoting Legoguy (Reply 10):
If some airlines prefer not to use airport air stairs due to costs and time, does the weight of the actual stairs onboard the aircraft add extra weight meaning additional fuel costs?

Yes, I have heard this does add weight and increases fuel costs, which is why most airlines have removed them. I think most NW DC9s had theirs removed to save fuel weight(can anyone confirm this?).
 
WNCrew
Posts: 872
Joined: Tue Jun 06, 2006 11:22 pm

RE: What's Under The Door?

Thu Oct 05, 2006 8:37 am

Quoting Mcdu (Reply 3):
to make sure that SWA can train their trolly dollys to do things one way only they retained this set up on the 737NG's. It is a shame that Boeing did not adopt more improvements in the NG's but SWA throughs a ton of weight around.

What makes you think SWA is the reason Boeing didn't change the design? Do you have a credible source?
ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.
 
Gr8Circle
Posts: 2397
Joined: Fri Dec 02, 2005 11:44 am

RE: What's Under The Door?

Thu Oct 05, 2006 9:51 pm

Quoting LVICS (Reply 9):
Here you go

Thanks!!  wave 
 
mcdu
Posts: 906
Joined: Thu Apr 28, 2005 5:23 am

RE: What's Under The Door?

Thu Oct 05, 2006 10:13 pm

Quoting WNCrew (Reply 13):
What makes you think SWA is the reason Boeing didn't change the design? Do you have a credible source?



Boeing tech rep was my source. However, look at the cockpit alone and you can see the items that were WNized for the NG's. There were articles in many of the major aviation weekly publications that detailed how the NG's had to be able to display round dial information because WN refused to teach differences. Also, WN still does not use A/T, VNAV, and prior to MDW crash were not allowed to use Auto Brakes. The entire industry is aware that WN is the largest customer for the airplane and thus they get what they want in terms of development. The problem I have is that WN is refusing technology and design enhancements for the sake of doing things the same way for 30 years, versus adapting new safety features that provide both the passengers and crews a higher level of saftey.

Just ask anyone flying the NG's in the ETOPS enviroment and they will tell you the plane needs a RAT and various other improvements. Right now it must fly ETOPS with the APU running, hardly efficient or wise on a continuous basis. But Boeing built for the largest customer and that is how it works in this industy.
 
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jetmech
Posts: 2316
Joined: Wed Mar 29, 2006 2:14 am

RE: What's Under The Door?

Thu Oct 05, 2006 10:33 pm

I presume that some sort of hinged flapper door opens to allow the retractable airstairs to deploy. Are pressurisation loads imposed directly upon this door when it is closed, or is the retractable airstair enclosed in an airtight cavity within the fuselage?
JetMech split the back of his pants. He can feel the wind in his hair :shock: .
 
LVICS
Posts: 63
Joined: Mon Aug 14, 2006 10:45 pm

RE: What's Under The Door?

Thu Oct 05, 2006 10:50 pm

Quoting Gr8Circle (Reply 14):
Thanks!!

My pleasure!! Big grin
 
bwaflyer
Posts: 496
Joined: Sat Jun 05, 2004 12:48 am

RE: What's Under The Door?

Thu Oct 05, 2006 11:53 pm

The door covering the airstairs retracts inside the fuselage and slides down.

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