Questions tagged [dc-9-family]

A twin-engine, T-tail regional airliner produced from 1965 until 2006, first by Douglas, followed by McDonnell Douglas, and then, finally, by Boeing.

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1answer
213 views

What about the DC-9's wing makes wingletting it so difficult?

A common way of making older airliners more efficient without increasing their wingspan is to add winglets, either as a retrofit for existing aircraft or as a new, wingletted derivative of a ...
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1answer
98 views

How much do a DC-9's wings weigh?

How much do the wings weigh? How much does the landing gear weigh? How much fuel does it take to fill the tanks? We, at Confederation College are trying to donate a DC-9 for training purposes and ...
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1answer
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Did the DC-9 ever use RATO in revenue service?

While reading the NTSB report on the crash of ALM Flight 980, I came across this interesting tidbit: ... The fuel charts used for the study made allowance for a higher consumption rate than the ...
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4answers
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Why does the DC-9-80 have this cusp in its fuselage?

The fuselage of the McDonnell Douglas DC-9-80 (marketed as the "MD-80") has a pronounced cusp at floor level, as can be seen in this diagram (courtesy of Boeing, eater of McDonnell Douglas - at least, ...
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1answer
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Where can I find information on the DC-9's turn radius in flight?

Does anyone know where I can find information on a DC-9-30's turn radius at various altitudes and airspeeds? I've tried Googling it, but all I've found is information about its turn radius while ...
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1answer
418 views

What prevents DC-9 series aircraft from being reengined with more-efficient engines?

All DC-9s except for the MD-90\B717 series use old, inefficient Pratt & Whitney JT8D series low-bypass turbofans, even the best of which have a paltry 1.74:1 bypass ratio. We know that a DC-9 can ...
6
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2answers
658 views

What is the round thing on the tip of an MD-90 wing?

I like to pretend I know about airplanes, but have always wondered what the round things on the tip of MD-90 wings are. Here is an image of what I am talking about: To be clear, my question is what ...
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2answers
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Why is the empennage of some aircraft not placed on the centerline?

Check the MD80's empennage below. Can easily tell it's not built on exactly centerline by naked eyes. Is that because aluminum joint or consider aerodynamics? I don't think it is manufacturing ...
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0answers
107 views

What is the big hole at the bottom of the vertical stabilizer on the Boeing 717? [duplicate]

What is the big hole located on the forward vertical stabilizer's bottom used for? (Image source)
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5answers
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Why do airliners have “pressure bulkheads”?

Image source: FAA What part of the fuselage aft of the bulkhead would leak pressure? Or is it just there to reduce stresses? How does a DC-9/MD-80/90 incorporate aft bulkheads when there's a ...
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3answers
630 views

MD81: Why are there so many lights on the fuselage?

Looking at this photo I can see lots of lights on the fuselage of this MD81. It can't be a reflection, can it? Source: Airliners.net Why are there so many lights?
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1answer
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What is this hole on the tail of an MD-88?

There's a little hole on the leading edge of the vertical stabilizer of this plane: What is that? What is its purpose? Thanks Source: Airliners.net
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1answer
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Was this a successful deployment of an MD-88 tail cone evacuation slide?

In this video, the tail cone is popped off as part of the evacuation. It stays attached on a lanyard which seems to be more of a hazard than letting it fall free. Additionally, the slide doesn't ...
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2answers
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Does the MD-80 seat layout affect the balance of the aircraft?

The MD-80 family has a 2-3 seat layout as seen in this image: Does the layout have any influence on the balance of the aircraft and if so what is used to balance out the weight? Image from seatguru....
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1answer
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Why is the MD-80 magnetic compass behind the first officer's seat?

I was watching this video about the MD-83 magnetic compass and I found it interesting that it's designed the way it is. I'm not sure which of the airplanes in this series featured this strange ...