zionstrat
Posts: 225
Joined: Sat Apr 28, 2001 3:26 am

MD 80- What's On The Nosewheel?

Tue Oct 02, 2001 5:39 am

Some members of the DC9 family seem to have a "box" that surrounds the rear half of the nose wheel as can be seen if you look closely at this photo-


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Photo © Remi Dallot



This is an MD83, but I thought I have seen 83's without this feature as well- Can anyone explain what this is and why it appears to be optional?

 
Tuffty
Posts: 91
Joined: Tue Mar 13, 2001 8:03 pm

RE: MD 80- What's On The Nosewheel?

Tue Oct 02, 2001 6:01 am

the box that i think your refering to at the back of the nose wheel is a stone deflector this is in place to prevent any debris that is thrown up from entering the engine intakes. i think that this was due to the earlyer types from having a large amount of fod damage.

regards tuffty Smile
 
Mr Spaceman
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Joined: Thu Mar 15, 2001 5:09 am

RE: MD 80- What's On The Nosewheel?

Tue Oct 02, 2001 6:07 am

Hi Zionstrat.

That's a good question...in fact, it's identical to one that I asked around 6 months ago.

If you click on my username, and then on Thread Starters under the Tech/Ops section of my personal profile...you'll find a post listed there at the very bottom that is tittled "DC-9 Nosegear Question". There's 21 replies to this post that are full of excellent info!

Basically, I learned that the object is a water/slush "Spray Deflector" kit, which helps keep any spray off the nosewheels from being induced into the aft engines, which are so close to the body.

Take Care.

Chris  Smile



"Just a minute while I re-invent myself"
 
L-188
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RE: MD 80- What's On The Nosewheel?

Tue Oct 02, 2001 4:24 pm

As has been mentioned before it is a spray deflector.

It works by making the spray from the tires go out at a shallower angle then just the normal tires. This was the spray misses the engines.

On some aircraft they have "chined" tires that accomplish the same thing. On those there is a rubber lip that is molded onto the tire that accomplishes the same thing.
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jwenting
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RE: MD 80- What's On The Nosewheel?

Tue Oct 02, 2001 5:02 pm

For the same reason, MD80s taxi with flaps extended. Anything thrown up by the wheels will hit the flaps and won't be sucked into an engine.
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rapo
Posts: 383
Joined: Fri Sep 17, 1999 12:04 pm

RE: MD 80- What's On The Nosewheel?

Tue Oct 02, 2001 10:52 pm

I saw these "chined" tires on a Fed Ex 727 at our local airshow. They look quite effective though I wonder if the would contribute to hydroplaning in deeper puddles.

rapo
 
FBU 4EVER!
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RE: MD 80- What's On The Nosewheel?

Tue Oct 02, 2001 11:26 pm

In addition to deflecting water and slush,the deflector also deflects sand and gravel on snow covered runways here in Scandinavia,something a chined tire won't.
Additionally,there are deflectors on the maingear as well,not a "box"-like thing as on the nosewheel but a "T"-shaped bar mounted on the bottom of the main gear leg.All our DC-9 and MD-80/90 aircraft in SAS are so equipped.
"Luck and superstition wins all the time"!
 
Mr Spaceman
Posts: 2723
Joined: Thu Mar 15, 2001 5:09 am

RE:Jwenting

Wed Oct 03, 2001 12:40 am

Hi Jwenting.

I find it pretty interesting that MD-80's would taxi with their flaps extended, to help deflect any spray (I suspect from the main gear tires), from being induced into the engines. I didn't think that they would ever taxi fast enough (especially in rain/slush), to cause a large amount of spray.

By flaps extended...Do you mean FUll flaps (past T/O setting), even when taxiing for departure?

Chris  Smile

"Just a minute while I re-invent myself"
 
Tuffty
Posts: 91
Joined: Tue Mar 13, 2001 8:03 pm

RE: MD 80- What's On The Nosewheel?

Wed Oct 03, 2001 2:38 am

the tyres also have a lip surrounding, on the side walls, them to throw the water away from the fuselage but the deflector will also play some part in this. alot of aircraft with low slung intakes have these deflectors to prevent damage.

regds tuffty Smile
 
zionstrat
Posts: 225
Joined: Sat Apr 28, 2001 3:26 am

RE: MD 80- What's On The Nosewheel?

Wed Oct 03, 2001 2:46 am

Thanks everyone! Great input, more proof that there are no new questions and I've got to do better with the search engine-

MrSpaceman, what a great thread! I really appreciated the close up -

This site just gets better and better!
 
RyDawg82
Posts: 833
Joined: Fri Sep 14, 2001 8:30 am

RE: MD 80- What's On The Nosewheel?

Wed Oct 03, 2001 4:34 am

Depends on the airline as far as flaps down on a MD80 during taxi...

Alaska or American and NWA, the primary OPS of the MD80 do not follow this process...

Ryan
You can take the pup out of Alaska, but you can't take the Alaska out of the pup.
 
Guest

RE: MD 80- What's On The Nosewheel?

Wed Oct 03, 2001 10:22 am

Everytime I would see an FL 717 at GPT I wondered what that thing was. It always mystified me, I plan on flying on another 717 this December...
 
FBU 4EVER!
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RE: MD 80- What's On The Nosewheel?

Wed Oct 03, 2001 7:29 pm

Taxiing with flaps down is also performed by SAS.Before taxi,T/O flap setting and after landing the landing flap setting is used until approaching the gate.FOD prevention is not the main reason,by having the flaps down it will facilitate an emergency evacuation should something happen.The flaps make a nice slide.
"Luck and superstition wins all the time"!

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