airfoilsguy
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Why Is The Gear Called Main Landing Gear?

Tue Dec 13, 2005 11:02 am

I have always wondered why they call the landing gear the "main landing gear". Calling it that would seem to imply there is a reserve landing gear. There a currently no planes to my knowledge that have back up landing gear. In my mind calling the landing gear "main" is redundant. Why is this done?
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NKP S2
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RE: Why Is The Gear Called Main Landing Gear?

Tue Dec 13, 2005 11:14 am

It's main landing gear....as opposed to the nose landing gear.
 
corey07850
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RE: Why Is The Gear Called Main Landing Gear?

Tue Dec 13, 2005 11:15 am

Quoting NKP S2 (Reply 1):
It's main landing gear....as opposed to the nose landing gear.

Spot on... well in the case of a tricycle gear plane  Wink
 
SlamClick
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RE: Why Is The Gear Called Main Landing Gear?

Tue Dec 13, 2005 11:24 am

Quoting Corey07850 (Reply 2):
well in the case of a tricycle gear plane

Quite right there. As opposed to a tailwheel on the non-conventional "conventional" landing gear.

Mains are the load carriers. Nosewheel or tailwheel are for steering and because engineers learned in geometry 101 "any three points form a plane" without them an airplane would tip over. They carry a very small portion of the total load on the ground.
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bri2k1
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RE: Why Is The Gear Called Main Landing Gear?

Tue Dec 13, 2005 11:31 am

Quoting SlamClick (Reply 3):
any three points form a plane

I hope I'm not the only one who catches the subtle humor there. And, as an Engineer, I represent that remark  Smile Thanks for your always informative and witty contributions.
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fr8mech
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RE: Why Is The Gear Called Main Landing Gear?

Tue Dec 13, 2005 11:38 am

Some aircraft do have supplementary gear also known as the tailskid. The tailskid is usually found in the AMM and MEL under chapter 32 (landing gear)
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ReidYYZ
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RE: Why Is The Gear Called Main Landing Gear?

Tue Dec 13, 2005 11:41 am

Also to differentiate from the center gear A340's, DC10 (-30 and any other model with it) and MD11 and the body gear B747, and I guess A380 if that's what they call it.
 
474218
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RE: Why Is The Gear Called Main Landing Gear?

Tue Dec 13, 2005 12:40 pm

The "main" landing gear supports the "main" portion of the aircraft weight, when the aircraft is on its wheels.
 
usnseallt82
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RE: Why Is The Gear Called Main Landing Gear?

Tue Dec 13, 2005 12:55 pm

Quoting Airfoilsguy (Thread starter):
Why Is The Gear Called Main Landing Gear?

As others have already stated, the 'main landing gear' term is to denote the main set of gear that supports the majority of the aircraft's weight, is designed for the hardest impact of the landing, and is the first set of gear to touch the ground during landing. All other gear is misc. to the main landing gear, though equally important. But, the main gear supports the real forces of the aircraft functions on the ground.
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HAWK21M
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RE: Why Is The Gear Called Main Landing Gear?

Wed Dec 14, 2005 5:05 am

Main load carried by the Main Landing gear.
Nose mounted gear called Nose Landing Gear.
Some Aircrafts have a Center Gear & few a Tail wheel assy.
regds
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