Starlionblue From Greenland, joined Feb 2004, 16360 posts, RR: 66 Reply 1, posted (9 years 4 months 3 weeks 1 day 17 hours ago) and read 4583 times:
It is reattached, or more likely the part is sent back to Boeing or written off and a new part fitted.
Many MD-81/82s with the original pointy tail have been retrofitted with the screwdriver tail. I think you'll find that if there is no damage/buckling/cracking of structural members, most airframe parts are not so expensive to replace as to require writing off the airframe.
"There are no stupid questions, but there are a lot of inquisitive idiots." - from Citadel by John Ringo
4jaded From United States of America, joined Apr 2004, 248 posts, RR: 0 Reply 2, posted (9 years 4 months 3 weeks 1 day 15 hours ago) and read 4486 times:
It is my understanding that this part is designed to jettison from the aircraft in an evacuation. Like other emergency devises like slides there has been countless inadvertant deployments over the years. I am certain that when Douglas developed this aircraft and this feature they were aware of the
ooops factor. In most cases I am confident that it should only require an inspection before it is attatched back onto the airplane.
SafetyDude From United States of America, joined Sep 2001, 3795 posts, RR: 16 Reply 4, posted (9 years 4 months 3 weeks 23 hours ago) and read 4178 times:
Does anybody know if when the tail cone of a DC9 or equivalent is jettisoned for an evacuation, can it be attached or is the aircraft then effectively written off?
Almost everything on an aircraft can be replaced. For the tail cone on the DC-9, the plane would not really be a good buy if millions of dollars are lost when a hundred dollar item falls off.
Broke From United States of America, joined Apr 2002, 1322 posts, RR: 3 Reply 5, posted (9 years 4 months 3 weeks 22 hours ago) and read 4126 times:
The tailcone on the DC-9 is mostly fabricated from fiberglass. When it comes off, either intentionally or inadvertently, it usually gets a ding (surfing term) at its pointy end which requires a minor repair before being reused.
I think the MD-80 boattail tailcone is also composite and would get dinged at the lower edge of the boattail when ejected.
The tail slide is mounted at the edge of the metal structure just forward of the where the tailcone comes off and it is deployed manually after the tailcone is out of the way.
There is a narrow catwalk, that gives a tricky access to the slide, with heavy canted curved beams that carry the empennage loads into the fuselage overhead. It is very easy to fram your head into one of these beams. Ouch, ouch, ouch!! The catwalk starts over the APU shroud and the compartment is usually very smelly from skydrol. Experience talking.
Broke From United States of America, joined Apr 2002, 1322 posts, RR: 3 Reply 7, posted (9 years 4 months 3 weeks 19 hours ago) and read 3997 times:
My first experience with someone dumping the tailcone when attempting to lower the ventral airstairs occurred on a DC-9-50 that we were modifying for introduction into Eastern's fleet. Someone inside the plane yelled out to lower the airstairs and my compatriot pulled the wrong handle!! He reached out without really looking at what he was reaching for. His first name was Henry and from then on, the external tailcone jettison handle was known by us as the "Hank" handle.
SlamClick From United States of America, joined Nov 2003, 10062 posts, RR: 69 Reply 8, posted (9 years 4 months 3 weeks 9 hours ago) and read 3825 times:
It's been said that the real reason for the screwdriver tailcone is so it won't roll so far when it is accidentally dumped.
I used to be able to claim that the only time in my whole career I ever had lost comm was in a DC-9 when the last bonding cable to the tailcone finally broke. We got in a high altitude stratus layer and the ice crystals brushing down the ungrounded tailcone caused a squeal in all the radios that did not go away until we left the clouds. Needless to say it took them a while to find the broken bonds in response to our writeup, but it fixed the problem.
I can't say it was the only time anymore because that happens to the Airbus every time it gets in heavy clouds at altitude.
Happiness is not seeing another trite Ste. Maarten photo all week long.
FBU 4EVER! From Norway, joined Jan 2001, 998 posts, RR: 7 Reply 11, posted (9 years 4 months 2 weeks 6 days 17 hours ago) and read 3642 times:
The original DC-9/MD-80 pointed tailcone weighs 48 kgs. It is designed so as to hit the ground and roll off to one side so as not to obstruct the tailcone slide when it inflates.
The "screwdriver" tailcone did not roll away as easily,and that may be the reason for the MD-90 having the mentioned gas bottle to deflect the cone away from the A/C:
MD-90 From United States of America, joined Jan 2000, 8475 posts, RR: 13 Reply 15, posted (9 years 4 months 2 weeks 5 days 5 hours ago) and read 3498 times:
Due to the internal air pressure (at altitude, at least), I'll bet it would pop off like a cork from a champagne bottle.
It'd be interesting if someone tried a D.B. Cooper style escape from one and chose that method instead of trying to get out without having the rear airstairs beat them to death against the lower fuselage.
I would've guessed that the tailcone weighs about 100 pounds, so 48 kilos sounds about right.
FBU 4EVER! From Norway, joined Jan 2001, 998 posts, RR: 7 Reply 16, posted (9 years 4 months 2 weeks 5 days 2 hours ago) and read 3481 times:
Like a champagne bottle? Nope,the tailcone was not part of the pressurized area,the aft cabin door forms part of the aft pressure bulkhead.The cooling louvres on either side of the aft fuselage,just below the fin,creates a slight underpressure within the tailcone compartment and this keeps the cone in place even if the locking pins are pulled.It will fall off as the plane slows down after landing.