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winterlight
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MD-80 Tail Cone Escape Slide

Fri Apr 17, 2015 5:24 pm

Never knew about this. In an emergency the tailcone can be jettisoned and a slide deployed. Has this feature ever had to be used?

http://www.md80.net/site/index.php?topic=2572.0

[Edited 2015-04-17 10:52:59]
Question everything. Trust no-one.
 
PGNCS
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RE: MD-80 Tail Cone Escape Slide

Fri Apr 17, 2015 6:24 pm

It has been a standard installation since the DC-9 program began. It has been used on multiple occasions and has been accidentally deployed numerous times as well.
 
MD95sOverATL
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RE: MD-80 Tail Cone Escape Slide

Fri Apr 17, 2015 7:15 pm

[Edited] Sorry got confused. Yeah, they all had the jettisonable tailcone up to the 717, which like the older MDs, does have a jettisonable tailcone and a small catwalk to the slide.



[Edited 2015-04-17 12:18:12]
EMB120, EMB145, CRJ200, MD88, MD90, 717, 737, 757, 777, A319, A321
 
MD95sOverATL
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RE: MD-80 Tail Cone Escape Slide

Fri Apr 17, 2015 7:21 pm

https://www.youtube.com/watch?v=P4DM0xF7xTE

You can see the slide here before they open the ventral stairs.

http://www.youtube.com/watch?v=TAndXzhgurI

Here's another one showing the tailcone being jettisoned.

[Edited 2015-04-17 12:23:31]
EMB120, EMB145, CRJ200, MD88, MD90, 717, 737, 757, 777, A319, A321
 
Dalmd88
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RE: MD-80 Tail Cone Escape Slide

Fri Apr 17, 2015 8:02 pm

Over the years there have been a few cases of the tail cone latches failing. The compartment just forward of the tail cone is behind the pressure bulkhead so it is unpressurized. The aerodynamic forces at the rear of the plane will not allow the unlatched cone fall off during flight. It falls off during the landing roll out. The only indication the crew has is the tower saying they left something on the end of the runway.
 
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litz
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RE: MD-80 Tail Cone Escape Slide

Fri Apr 17, 2015 8:38 pm

In many of the pictures of the DL "runway excursion" at LGA, you can see a ladder placed up to the open tailcone; that was one of the utilized egress routes during that evacuation, and was used by the FD as a convenient way into the plane afterwards.
 
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winterlight
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RE: MD-80 Tail Cone Escape Slide

Fri Apr 17, 2015 8:53 pm

Thanks for the video. Quite comical seeing it 'fall off'. At least they had the safety cushion on standby.
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yeelep
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RE: MD-80 Tail Cone Escape Slide

Fri Apr 17, 2015 9:34 pm

Quoting winterlight (Thread starter):
Never knew about this. In an emergency the tailcone can be jettisoned and a slide deployed. Has this feature ever had to be used?

Yes, though I'm not sure if one has ever been successfully deployed during an emergency. Here is one of many tailcone jettison fails.
http://www.youtube.com/watch?v=Z1bcZF3vAEk&feature=related

The video I linked to shows a later type of tailcone jettison setup that is supposed to swing the tailcone out of the way before the slide deploys. Below was my attempt explain the basic workings from a thread three years ago.

"Its not an issue when the kevlar lanyard is routed correctly. Now I haven't worked on the Maddog for about five years, so I may miss a few details but here's what I can recall about the tailslide deployment.
There's three ways to release the tailcone. The rear bulkhead door when armed, a interior handle aft of the pressure bulkhead and a exterior handle. When triggered, tension is released from a cable that normally holds the spring loaded tailcone locks closed. The locks then rotate and the tailcone is released. There is a lanyard that is attached to the tailcone, with the other end attached to the slide cover. In the middle is a small loop that attaches to a spring loaded release mechanism on the left side of the fuselage opening. This is where the problems arise. The routing to the mechanism is not intuitive and the manual is somewhat difficult to decipher, so it is unfortunately not unheard of to mis-route the lanyard causing the tailcone to not fully release. When operating normally the tailcone which is connected to the release mech. by the lanyard, will drop and then swing aircraft left. The weight of the tailcone will activate the release mech. and the tailcone will drop to the ground off to left of the aircraft. In doing so the slide cover is pulled out the back of the airplane, releasing the slide which then inflates."
 
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MD80
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RE: MD-80 Tail Cone Escape Slide

Sat Apr 18, 2015 2:46 am

Here is a photo showing the mentioned slide after the evacuation of an MD-81 of Japan Air System in January 2004:

http://aviation-safety.net/photos/di...oto.php?id=20040101-0&vnr=2&kind=C

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KELPkid
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RE: MD-80 Tail Cone Escape Slide

Sat Apr 18, 2015 5:15 am

Didn't DL just have an MD-88 go off the runway at LGA recently? IIRC, they had a successful evacuation that included a successful tailcone slide deployment and quite a few pax evacuated through the tail...
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winterlight
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RE: MD-80 Tail Cone Escape Slide

Sat Apr 18, 2015 7:15 am

Seems it has happened a few times. I need to pay more attention!
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WNCrew
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RE: MD-80 Tail Cone Escape Slide

Sat Apr 18, 2015 7:17 pm

Quoting yeelep (Reply 7):
Yes, though I'm not sure if one has ever been successfully deployed during an emergency.

Yes, it has been used successfully many times. I know Alaska, Allegiant, American, Continental, and AirTran, have all successfully deployed the tailbone slide and used it to evacuate. There are likely others as well.
ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.
 
Viscount724
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RE: MD-80 Tail Cone Escape Slide

Sat Apr 18, 2015 10:31 pm

An AC DC-9-32 experienced a failure in the rear pressure bulkhead while climbing through 25,000 feet on a BOS-YHZ flight with a stop at YQI (Yarmouth, Nova Scotia) in 1979. Much of the pressure bulkhead and the tailcone fell into the Atlantic. The pilots could see daylight out the rear of the aircraft when they opened the cockpit door. Luckily the aircraft was able to return safely to BOS about 40 minutes after takeoff with some impact on the flight controls. One flight attendant suffered minor injuries due to the sudden decompression (lucky he or she wasn't sucked out of the aircraft).
http://www.airdisaster.com/reports/ntsb/AAR80-13.pdf

The aircraft was repaired and returned to service a couple of months later. Unfortunately that aircraft (C-FTLU) wasn't as lucky 4 years later as it was the aircraft involved in the emergency landing with a serious cabin fire at CVG in 1982, on a flight from DFW to YYZ, resulting in 23 fatalities of the 46 aboard.

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