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MD 80- What's On The Nosewheel?

Zionstrat From United States of America, joined Apr 2001, 226 posts, RR: 1
Posted (11 years 7 months 3 weeks 1 day 17 hours ago) and read 2044 times:

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-

Click for large version

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?

12 replies: All unread, jump to last

Tuffty From United Kingdom, joined Mar 2001, 92 posts, RR: 0
Reply 1, posted (11 years 7 months 3 weeks 1 day 16 hours ago) and read 1959 times:

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 From Canada, joined Mar 2001, 2780 posts, RR: 15
Reply 2, posted (11 years 7 months 3 weeks 1 day 16 hours ago) and read 1947 times:

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 From United States of America, joined Jul 1999, 29350 posts, RR: 62
Reply 3, posted (11 years 7 months 3 weeks 1 day 6 hours ago) and read 1875 times:

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.

OBAMA-WORST PRESIDENT EVER....Even SKOORB would be better.

Jwenting From Netherlands, joined Apr 2001, 10213 posts, RR: 21
Reply 4, posted (11 years 7 months 3 weeks 1 day 5 hours ago) and read 1857 times:

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.

I wish I were flying

Rapo From United States of America, joined Sep 1999, 395 posts, RR: 0
Reply 5, posted (11 years 7 months 3 weeks 23 hours ago) and read 1835 times:

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! From Norway, joined Jan 2001, 998 posts, RR: 7
Reply 6, posted (11 years 7 months 3 weeks 23 hours ago) and read 1826 times:

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 From Canada, joined Mar 2001, 2780 posts, RR: 15
Reply 7, posted (11 years 7 months 3 weeks 22 hours ago) and read 1810 times:

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 From United Kingdom, joined Mar 2001, 92 posts, RR: 0
Reply 8, posted (11 years 7 months 3 weeks 20 hours ago) and read 1801 times:

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 From United States of America, joined Apr 2001, 226 posts, RR: 1
Reply 9, posted (11 years 7 months 3 weeks 19 hours ago) and read 1798 times:

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 From United States of America, joined Sep 2001, 818 posts, RR: 9
Reply 10, posted (11 years 7 months 3 weeks 18 hours ago) and read 1790 times:

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.

Critter592 From , joined Dec 1969, posts, RR:
Reply 11, posted (11 years 7 months 3 weeks 12 hours ago) and read 1774 times:

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! From Norway, joined Jan 2001, 998 posts, RR: 7
Reply 12, posted (11 years 7 months 3 weeks 3 hours ago) and read 1770 times:

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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