Frontiercpt
Posts: 955
Joined: Tue Jun 08, 2004 9:47 am

Where Are Overwing Exits Stored?

Sun Jul 04, 2004 12:23 pm

I was looking at a safety card I got from a UA A230(I asked the FA for a spare), and I was noticing the over wing exit, and that the slide obviously cannot be stored in the exit door, like the other exits. So where is it stored? And how does it inflate? Does the FA, or Captain have control over that slide in particular, or what? Thanks in advance guys!
 
N777UA
Posts: 566
Joined: Thu Mar 25, 2010 10:06 pm

RE: Where Are Overwing Exits Stored?

Sun Jul 04, 2004 12:28 pm

Just like the 757 and 767, the pack is contained in a compartment inside the fuselage. When the window is opened, the slide is automatically triggered, it slides out of the compartment onto the wing and inflates.

Obviously, in airplanes with overwing doors (B747/747-400, DC-10/MD-11), the slide is inside the door.
 
Tango-Bravo
Posts: 2887
Joined: Sun Jun 17, 2001 1:04 am

RE: Where Are Overwing Exits Stored?

Sun Jul 04, 2004 12:34 pm

There are no slides in the the overwing emergency exit plug doors. In an emergency, the overwing doors of an A320 (or A319 or 737 Classic) are completely removed and the surface of the wing along the escape path painted on the wing next to the fuselage is the "slide" by which pax leave the aircraft. On 737NGs, the overwing emergency exit plug doors are hinged at the top and open outward, for pax to leave the aircraft in the same manner as earlier 737s and A319/320s.
 
Leezyjet
Posts: 3540
Joined: Sun Oct 14, 2001 7:26 am

RE: Where Are Overwing Exits Stored?

Sun Jul 04, 2004 12:36 pm

On the A321, the slide is located in a panel beneath the door. Obviously this a/c does not have overwing exits, but if you look closely under door 2 you can see the rectangular space that contains the slide.

On most a/c types with overwing exits, they do not have slides filtted to these doors. They merely rely on the flaps being fully extended to allow the passengers to slide down them. If a water landing happens, then these exits are often used to allow pax to climb out onto the wings wearing their life vests and the life rafts would be inflated on the wings to allow pax to climb into them.

However if you believe that an a/c can land on water and still resemble an a/c as pictured on the safety cards, then you seriously need to have a word with yourself.  Laugh out loud

 Smile

 Smile
"She Rolls, 45 knots, 90, 135, nose comes up to 20 degrees, she's airborne - She flies, Concorde Flies"
 
N777UA
Posts: 566
Joined: Thu Mar 25, 2010 10:06 pm

RE: Where Are Overwing Exits Stored?

Sun Jul 04, 2004 12:37 pm

There ARE slides on the A320/757/767...I've seen videos courtesy of United Airlines that showed evacuation drills.

Just looked it up in my mom's Flight Attendant Operations Manual as well...
 
Airbus_A340
Posts: 1439
Joined: Sat Mar 11, 2000 8:41 pm

RE: Where Are Overwing Exits Stored?

Sun Jul 04, 2004 3:51 pm

Can you show proof of the A320 having overwing slides? I was very sure that they didn't have them, as the above posters have said.
People. They make an airline. www.cathaypacific.com
 
ha763
Posts: 3168
Joined: Mon Jan 06, 2003 5:36 pm

RE: Where Are Overwing Exits Stored?

Sun Jul 04, 2004 5:33 pm

The A320 family does have overwing exit slides. It is too high to allow pax to "slide" down the flaps.

Safety card from a Air Moldova A320 showing overwing slides:
http://www.aeroplane.ru/cards/Moldova/Air+Moldova/Airbus+A320/side2

Aeroflot a319 safety card:
http://www.aeroplane.ru/cards/Russian+Federation/Aeroflot+Russian+Airlines/Airbus+A319/side1

Where are they located?
Most likely the same area as the 757/767, in the fuselage above the rear area of the wing.

How are they activated?
Opening the exit will inflate the slide as they are always armed unless disarmed for maintenance reasons.

[Edited 2004-07-04 10:40:45]
 
User avatar
Crosswind
Posts: 2536
Joined: Sat Nov 25, 2000 4:34 am

RE: Where Are Overwing Exits Stored?

Sun Jul 04, 2004 8:42 pm

At the overwing exits on the B747 the slide is in 2 parts. The section stored in the door is the overwing ramp, and the section stored in the wing-to-body fairing is the actual slide.

This can be seen in these photos, as can the stowage open and closed.

View Large View Medium
Click here for bigger photo!

Photo © Peter de Groot
View Large View Medium
Click here for bigger photo!

Photo © José Ramón Valero - IBERIAN SPOTTERS



There have been several potentially serious incidents where overwing slides have deployed inflight due to faulty rigging of their stowage doors, causing them to be ripped off by the airflow...

Regards
CROSSWIND
 
ChiGB1973
Posts: 1394
Joined: Mon Mar 22, 2004 6:39 am

RE: Where Are Overwing Exits Stored?

Mon Jul 05, 2004 1:28 am

On the 757-300 the dual lane ramp and slide is stored in the wing body. The spoilers automatically retract to prevent damage to the slide. Lots of mechanical stuff going on with an a/c that requires evacuation. Are there springs in the spoilers that accomplish this, surely it can't rely on hydraulics or electrical?

The OW window is removed and placed in the seats. I wonder why they don't operate like the 737-800 (swing up on a hinge)? It would be easier. Can't throw it out, the slide would be damaged. You cannot use these exits in a water ditch. Maybe because of the slides being in the wings and the balance on the a/c with only one deployed or something?

It is automatically deployed when the window is opened unless it malfunctions. A mechanic in Indy deployed one. I just saw the pictures. It's a cool pic; I would hate to be the one responsible. Maybe I can scan it when I am down there later this month.

Interesting, the 737-800 spoilers/flaps (whichever or both?) deploy to use as a slide. No slide to hide.

Maybe I should start a topic in Technical, but this kinda goes with the topic at hand.

M
 
AA777
Posts: 2358
Joined: Thu May 20, 1999 7:07 am

RE: Where Are Overwing Exits Stored?

Mon Jul 05, 2004 1:37 am

Yeah, I thought that alot of these planes have the overwing exits where the pax can slide down the flaps. Seems like a bad idea to me, since... alot of those planes a bloody high up, and even if a 747-400 had them all the way down, the person will still fall like.... 20-30 feet? PLUS, what if they are damaged?

-AA777
 
User avatar
longhauler
Posts: 4941
Joined: Sat Mar 06, 2004 12:00 am

RE: Where Are Overwing Exits Stored?

Mon Jul 05, 2004 2:08 am

The A319/A320 overwing slides are located in a compartment just above the wing root trailing edge and are automatically deployed when the overwing exit is opened on that side, or either overwing exit in the case of the A320.

While they are not controlled by the cockpit, we CAN monitor them, and their status shows up on our ECAM.

Incidentally, they are always armed, even when the aircraft is at the gate.
Just because I stopped arguing, doesn't mean I think you are right. It just means I gave up!
 
Frontiercpt
Posts: 955
Joined: Tue Jun 08, 2004 9:47 am

RE: Where Are Overwing Exits Stored?

Mon Jul 05, 2004 2:38 am

Cool! Thanks everyone for all the information, and explanations!
 
FA4UA
Posts: 777
Joined: Sat Nov 22, 2003 6:26 pm

RE: Where Are Overwing Exits Stored?

Mon Jul 05, 2004 3:18 am

On the Airbus overwing exits (at least on the 319/320 which I'm trained on) there is a manual inflation handle on the inside of the "door jam" at the top. The slides are always armed, as stated above, but there is a backup inflation system.

FA4UA
The debate continues... Starwood or Hyatt... which is better
 
richardw
Posts: 3131
Joined: Tue May 08, 2001 3:17 am

RE: Where Are Overwing Exits Stored?

Mon Jul 05, 2004 4:08 am

Does an easyJet A319 with two overwing exits have a different arrangement?
 
SafetyDude
Posts: 3654
Joined: Fri Sep 07, 2001 10:02 am

RE: Where Are Overwing Exits Stored?

Mon Jul 05, 2004 4:34 am

How does the OW exit on the A310 work (as the door falls "down")?

Also, for the 747 (and other planes that also have a two-stage slide) OW exit, does the slide that goes down the wing inflate first (maybe with only a split-second delay) so that the slide in the door can overlap the wing slide, thus prevting people from tripping, or is there just a little area not covered by the slide (or do the slides align perfectly)?

 Smile
-Will
"She Flew For What We Stand For"
 
MD11Engineer
Posts: 13916
Joined: Sun Oct 26, 2003 5:25 am

RE: Where Are Overwing Exits Stored?

Mon Jul 05, 2004 6:03 am

Concerning the A320 family overwing slide packs, I installed and removed quite a few at my old job. They are sited behind a roughly rectangular panel on the wing to body fairing aft of the emergeny escape doors. On the A320 the respective nitrogen cylinders and valves are located in the aft cargo side walls, accessible through a panel in the cargo hold, while on the A321 they are located in the overhead bins, left and right.
They are mechanicaly triggered by a pin attached to each plug door, which will rotate a cam, which is in turn connected to a push-pull cable, which opens the deploy valve. For maintenance purposes the pin can be retracted and twisted into a bayonett type fitting, so that it won´t move the cam if you open the door (if you´ve got to work on top of the wing and the cargo hold is loaded). Don´t try this on your next flight, because the removal of the plastic cover over the door handle will cause a door warning in the cockpit.
You still have to be carefull that you won´t touch the cam. To be totaly safe, you´ll have to install a pin in the main valve on the cylinder.

The reason for an overwing escape slide is that the A320 has a quite tall landing gear and it is quite high to get down from the wing.

Jan
Je Suis Charlie et je suis Ahmet aussi
 
shark
Posts: 52
Joined: Thu Jun 23, 2005 10:24 pm

RE: Where Are Overwing Exits Stored?

Mon Jul 05, 2004 9:47 am

"On the 757-300 the dual lane ramp and slide is stored in the wing body. The spoilers automatically retract to prevent damage to the slide. Lots of mechanical stuff going on with an a/c that requires evacuation. Are there springs in the spoilers that accomplish this, surely it can't rely on hydraulics or electrical?"

Well I can't speak for the 757, but on the 767 the inboard spoilers have a squib attached to the actuators. A squib is a very small explosive device. When the slide is deployed the squib goes off cracking the actuator body causing it to loose all pressure and the spoiler drops down. These were real fun after a maint check if they had been dissconnected. We had to do a stray voltage check before hooking them back up.
 
fadec
Posts: 45
Joined: Sun Jun 20, 2004 1:27 pm

RE: Where Are Overwing Exits Stored?

Sat Jul 10, 2004 4:17 pm

Yes, the 757 is the same as the 767 with the squibs in the spoilers. They prefer explosives over normal hydraulic or electric power due the speed of retraction that is required. The time between the slide being deployed and it being on top of the spoiler panel is less then two seconds on average. They need them to out of the way before this time so the spoiler does not damage the side.

My only guess as to why they don't put many OW plug doors on hinges is they don't want to deal with the added design cost and extra structural work that would be required. that's just my guess anyway.
 
phollingsworth
Posts: 635
Joined: Sat Mar 06, 2004 6:05 am

RE: Where Are Overwing Exits Stored?

Mon Jul 12, 2004 2:13 am

The over wing exits/slides is one of the many differences between the 767 and 757, at least with respect to disarming them. The 767 is a laborious process. However, on the 757, between the two window exits, in the cabin, there is a panel, behind this panel is the slide disarm.

As for why the 757 and 767 don't have the hinged exits. This stems from the era in which they were designed. The 737NGs are the newest narrowbodies out there. However, they are built on the same type certificate as the original 737-100. This means that the exit size requirements are not the same for them as they are for the newer aircraft. Thus the 737-800 is certified to carry more passengers than the A320, using the same number of exits. To alleviate some of the stink, and at the request of some customers, Boeing redesigned the overwing exits to make the auto opening. This reduces that amount of time it takes to open the exit, this allowing more people out of the a/c in a specific amount of time.
 
Airbus_A340
Posts: 1439
Joined: Sat Mar 11, 2000 8:41 pm

RE: Where Are Overwing Exits Stored?

Mon Jul 12, 2004 12:10 pm

Ha763:
thank you for clearing that up.
People. They make an airline. www.cathaypacific.com
 
RedDragon
Posts: 1096
Joined: Sat Jul 03, 2004 2:24 am

RE: Where Are Overwing Exits Stored?

Tue Jul 20, 2004 9:11 pm

As SafetyDude was wondering, does anyone know about the door/slide operation on the A310? (I've wondered about this before... is the door actually bottom-hinged? Do evacuating pax really have to trample all over the door to get out?) Presumably this is the same for four-door 757s and 767s, and the A346 as well?

And what about the small upper-deck doors on 741s and 742s?  Big grin Do they have a slide?
 
SafetyDude
Posts: 3654
Joined: Fri Sep 07, 2001 10:02 am

RE: Where Are Overwing Exits Stored?

Tue Jul 20, 2004 9:41 pm

Do evacuating pax really have to trample all over the door to get out?) Presumably this is the same for four-door 757s and 767s, and the A346 as well?
I believe that there is a slide attached to A310 OW exit, but I imagine that watching a door fall onto the wing, bottom-hinged, and then seeing an evacuation slide overtake the door and inflate to the side would be quite a sight.

The four-door 757s and 767s are similar to the A310, but since there is no wing, the doors can rotate completely outside and the slide can inflate. See this picture: http://aviation-safety.net/pictures/displayphoto.php?id=990087&vnr=1&kind=E.

The A346 OW exit is just like the other doors, except that the slide goes down the wing (similar to the 330, 340, 747, 777 OW exit).

And what about the small upper-deck doors on 741s and 742s? Do they have a slide?
They do. The door, someone could got into more details on this, basically rotates in, and then moves over like a sliding door, and then you have to manually release the evacuation slide.

 Smile
-Will
"She Flew For What We Stand For"
 
RedDragon
Posts: 1096
Joined: Sat Jul 03, 2004 2:24 am

RE: Where Are Overwing Exits Stored?

Fri Jul 23, 2004 8:49 pm

Re. the upper-deck slides on 741s and 742s, I found this picture in the database of a rather elderly 742 that overran the runway at Liège last year:


View Large View Medium
Click here for bigger photo!

Photo © Ivan Coninx - Brussels Aviation Photography



Don't think I'd fancy using that unless my life depended on it, it's a bit steep...

Rich
 
SafetyDude
Posts: 3654
Joined: Fri Sep 07, 2001 10:02 am

RE: Where Are Overwing Exits Stored?

Sat Jul 24, 2004 9:49 am

Wow, great eye to spot out that photo! I recently watched a 744 evacuation video (for FA review) and I was surprise that the slide is not as steep, and as a matter of fact, I would not be surprised if the main deck doors were steeper.

 Smile
-Will
"She Flew For What We Stand For"
 
TimT
Posts: 168
Joined: Sun Jun 03, 2001 1:38 pm

RE: Where Are Overwing Exits Stored?

Sat Aug 07, 2004 2:21 pm

One of the guys I worked with at TWA told me he was working on a 747 that had a slide deployed from the main cabin. He needed to get on the ground and jumped on the slide. Said he lost enough skin he'd never go down one again.
 
MD11Engineer
Posts: 13916
Joined: Sun Oct 26, 2003 5:25 am

RE: Where Are Overwing Exits Stored?

Sat Aug 07, 2004 5:40 pm

At my old job we had to blow slides regularly in the hangar, just for reliability tests. After the slide was blown (what a noise!), everybody in the cabin to a ride, of course wearing overalls. Big fun.

Jan
Je Suis Charlie et je suis Ahmet aussi

Who is online

Users browsing this forum: zaphod42 and 17 guests