B737200
Topic Author
Posts: 206
Joined: Sun Feb 20, 2005 5:30 pm

MD-80 Landing Gear

Fri Jun 02, 2006 1:52 am

My question is what is that "bar", I cannot think of a better word for it, at the back of the landing gear on the MD-80. I always wondered what it was, however recently I was asked what it was is by my computer teacher (who's into planes) and I decided I should ask around here seeing that a lot of you airplane technical whizzes hang out in the Tech/Ops forum.

I'll try link a picture but I've never tried that before so lets just hope it works.


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Photo © Philippe BLEUS




I'm referring to that thing stuck to the nose gear.

I read something about a stone deflector on a nose gear shot, not sure if it was referring to that bar. Hopefully someone can tell me what it is for sure.

Thanks a lot for your help.
Lady Guinness is ready to fly...
 
jamesbuk
Posts: 3712
Joined: Mon May 02, 2005 11:52 pm

RE: MD-80 Landing Gear

Fri Jun 02, 2006 1:56 am

I can think of 2 things which it might be, A stone deflecter or a skid (when the nosewheels pop, instead of noseing it it skids on the skid)

Rgds --James--
You cant have your cake and eat it... What the hells the point in having it then!!!
 
AirframeAS
Posts: 9811
Joined: Thu Feb 05, 2004 3:56 pm

RE: MD-80 Landing Gear

Fri Jun 02, 2006 2:17 am

Its a gravel deflector according to the AS Maintenance Manual.
A Safe Flight Begins With Quality Maintenance On The Ground.
 
FredT
Posts: 2166
Joined: Thu Feb 07, 2002 9:51 pm

RE: MD-80 Landing Gear

Fri Jun 02, 2006 2:18 am

It's a spray deflector.

Cheers,
Fred
I thought I was doing good trying to avoid those airport hotels... and look at me now.
 
B737200
Topic Author
Posts: 206
Joined: Sun Feb 20, 2005 5:30 pm

RE: MD-80 Landing Gear

Fri Jun 02, 2006 3:01 am

Thanks a million.

Just one more question, there also seems to be a "bar" on the rear undercarriage, this however seems to be shaped somewhat differently from the one on the nose; do these "bars" serve the same purpose as the one found on the nose gear?

Once again thanks.
Lady Guinness is ready to fly...
 
atlamt
Posts: 244
Joined: Thu Sep 13, 2001 12:15 am

RE: MD-80 Landing Gear

Fri Jun 02, 2006 7:57 am

The front is a spray deflector as FredT said. The water coming off the nose wheels has a habit of going straight into the engines without it. The 727 used chined tires to overcome this. Chined tires are expensive and douglas opted for the spray deflector instead.

Here is a pic of a chined tire.


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Photo © Charles Juszczak - Airside Photography



The rear deflector you see is for FOD. The 80's tend to kick up FOD into the engines. Part of our taxi procedures is to deploy flaps to 15 for FOD prevention. The deflector itself is metal and rubber and sits pretty close to the wheels about 6 inches off the ground.
Fwd to MCO and Placard
 
DeltaGuy
Posts: 3965
Joined: Wed Sep 12, 2001 5:25 am

RE: MD-80 Landing Gear

Fri Jun 02, 2006 8:40 am

That nose splash guard is only 2"-3" inches off the ground, hence you can't put a chock behind the nose wheel...have to put em both on the mains.

DeltaGuy
"The cockpit, what is it?" "It's the little room in the front of the plane where the pilot sits, but that's not importan
 
nonfirm
Posts: 426
Joined: Mon Sep 12, 2005 3:04 pm

RE: MD-80 Landing Gear

Fri Jun 02, 2006 9:14 am

The one installed on the nlg is the water or spray deflector and the one on the mlg is the gravel deflector.  airplane 
 
SlamClick
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Joined: Sun Nov 23, 2003 7:09 am

RE: MD-80 Landing Gear

Fri Jun 02, 2006 9:16 am

Quoting DeltaGuy (Reply 6):
That nose splash guard is only 2"-3" inches off the ground, hence you can't put a chock behind the nose wheel...have to put em both on the mains.

It also required a new edition of the DC-9 towbar. It is an inch or so wider than the nosegear lugs without the spray deflector. Most newer models can reach in to catch the lugs on DC-9s but the older one cannot spread far enough for an MD-80.
Happiness is not seeing another trite Ste. Maarten photo all week long.
 
2H4
Posts: 7960
Joined: Tue Oct 19, 2004 11:11 pm

RE: MD-80 Landing Gear

Fri Jun 02, 2006 9:45 am



Here are some visuals:

http://www.staynehoff.net/Model55_water_ingestion_test.jpg

http://www.staynehoff.net/Premier1_WaterIngestionTest.jpg




...And a video, in Windows and Quicktime.




2H4


Intentionally Left Blank
 
DeltaGuy
Posts: 3965
Joined: Wed Sep 12, 2001 5:25 am

RE: MD-80 Landing Gear

Fri Jun 02, 2006 11:42 am

Quoting SlamClick (Reply 8):
It also required a new edition of the DC-9 towbar. It is an inch or so wider than the nosegear lugs without the spray deflector. Most newer models can reach in to catch the lugs on DC-9s but the older one cannot spread far enough for an MD-80.

Yessir, sure does. I remember working the ramp back in the day, andh aving to have two different towbars for such purposes...even though both jets *seem* to be identical in that facet.

DeltaGuy
"The cockpit, what is it?" "It's the little room in the front of the plane where the pilot sits, but that's not importan
 
B737200
Topic Author
Posts: 206
Joined: Sun Feb 20, 2005 5:30 pm

RE: MD-80 Landing Gear

Sat Jun 03, 2006 2:16 am

Once again thanks for clearing things, you've all been EXTREMELY helpful, I really appreciate it.

Regards.
Lady Guinness is ready to fly...
 
FlyDeltaJets
Posts: 1631
Joined: Thu Feb 02, 2006 4:24 pm

RE: MD-80 Landing Gear

Sun Jun 04, 2006 11:43 am

Quoting DeltaGuy (Reply 6):
That nose splash guard is only 2"-3" inches off the ground, hence you can't put a chock behind the nose wheel...have to put em both on the mains.

DeltaGuy

DL's policy is to chock the main's on all A/C
The only valid opinions are those based in facts
 
AirframeAS
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Joined: Thu Feb 05, 2004 3:56 pm

RE: MD-80 Landing Gear

Fri Jun 16, 2006 7:09 am

Quoting B737200 (Reply 4):
there also seems to be a "bar" on the rear undercarriage, this however seems to be shaped somewhat differently from the one on the nose; do these "bars" serve the same purpose as the one found on the nose gear?

Yes they do, but these two 'bars' keep the rocks and other FOD from entering the engines.
A Safe Flight Begins With Quality Maintenance On The Ground.
 
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HAWK21M
Posts: 29867
Joined: Fri Jan 05, 2001 10:05 pm

RE: MD-80 Landing Gear

Fri Jun 16, 2006 4:55 pm

Quoting FlyDeltaJets (Reply 12):
DL's policy is to chock the main's on all A/C

Are you saying the NLG wheels are never chocked.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
avioniker
Posts: 1099
Joined: Tue Jan 01, 2002 5:38 am

RE: MD-80 Landing Gear

Fri Jun 16, 2006 9:43 pm

In a study done by a university specializing in aviation studies a couple of years ago, every broken spray deflector, submitted for examination, had yellow paint on the bottom.
Hence, NEVER chock the nose wheels on an aircraft so equipped.
One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533
 
FlyDeltaJets
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Joined: Thu Feb 02, 2006 4:24 pm

RE: MD-80 Landing Gear

Mon Jun 19, 2006 2:51 am

Quoting HAWK21M (Reply 14):
Are you saying the NLG wheels are never chocked.

The nose gear is alos chocked but only the front on MD88/90 a/c
The only valid opinions are those based in facts
 
AirframeAS
Posts: 9811
Joined: Thu Feb 05, 2004 3:56 pm

RE: MD-80 Landing Gear

Tue Jun 20, 2006 6:25 am

Quoting Avioniker (Reply 15):
Hence, NEVER chock the nose wheels on an aircraft so equipped.

 checkmark  Same with 732's with gravel deflectors.
A Safe Flight Begins With Quality Maintenance On The Ground.
 
n8076u
Posts: 419
Joined: Mon Jun 19, 2006 10:52 am

RE: MD-80 Landing Gear

Tue Jun 20, 2006 7:25 am

Not sure about other airlines, but at UAL according to the ops manual, you could only chock the nose if the aircraft would be moving in a couple hours (honestly, I don't remember the exact number, but I believe it was 2 or 4 hours), but it was preferrable to chock the mains and to hook up the towbar/tug if possible. If the aircraft would not be moving within the specified time, you had to chock the mains anyways. Unfortunately, it's been a few years since I've had the pleasure, and I am going strictly by memory.

The DC-10-30's we had always got the mains chocked, as the brakes had to be released in order to fuel/load the aircraft, due to the center main gear being tilted differently than the mains.

Chris
Don't blame me, I don't work here...

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