highflyer9790
Posts: 1189
Joined: Thu Jul 07, 2005 1:21 am

NoseGear Question

Fri Oct 06, 2006 8:42 am

Hello all-

After looking at this rather interesting photo, i am wondering what the two torpedo-like tubes are sticking out above the nose gear. i have seen this on a few other aircraft as well. Also, to how many pounds is that jack rated for?  


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Photo © Joe Pries - ATR Team



Highflyer

btw, i would think landing/taxi lights would be HIDs by now...lol...they are on some CRJs...

[Edited 2006-10-06 01:43:33]
121
 
EMBQA
Posts: 7797
Joined: Sat Oct 25, 2003 3:52 am

RE: NoseGear Question

Fri Oct 06, 2006 8:47 am

Nose steering actuators...
"It's not the size of the dog in the fight, but the size of the fight in the dog"
 
highflyer9790
Posts: 1189
Joined: Thu Jul 07, 2005 1:21 am

RE: NoseGear Question

Fri Oct 06, 2006 9:29 am

Quoting EMBQA (Reply 1):
Nose steering actuators...

not sure i follow you on that one...
121
 
474218
Posts: 4510
Joined: Mon Oct 10, 2005 12:27 pm

RE: NoseGear Question

Fri Oct 06, 2006 10:05 am

They are the nose gear steering actuators. There is a piston in each one and as hydraulic fluid is ported to them the piston either extends or retracts, that is how they move the nose gear left or right.
 
fr8mech
Posts: 6627
Joined: Mon Sep 26, 2005 9:00 am

RE: NoseGear Question

Fri Oct 06, 2006 10:51 am

Quoting Highflyer9790 (Thread starter):
Also, to how many pounds is that jack rated for

Normally rated for 60 tons. Remember, you're only lifting the nose, which carries just a fraction of the total weight of the aircraft.
When seconds count...the police are minutes away.
 
SFOMB67
Posts: 371
Joined: Thu Dec 08, 2005 1:20 pm

RE: NoseGear Question

Fri Oct 06, 2006 2:14 pm

Quoting 474218 (Reply 3):
that is how they move the nose gear left or right.

To get a little more technical, the main portion of the nose landing gear does not rotate. As you can see, the steering cylinders are mounted where the lower strut piston extends from, or out of, the upper section of the nose gear. The steering cylinders merely turn the lower piston, with the wheels attached. As 474218 stated, fluid is ported to the two steering cylinders (one extends and the other retracts), and as a result, the lower piston rotates and steering is accomplished.
Not as easy as originally perceived
 
Spruit
Posts: 367
Joined: Fri Oct 28, 2005 12:34 am

RE: NoseGear Question

Fri Oct 06, 2006 7:10 pm

Quoting Fr8Mech (Reply 4):
you're only lifting the nose

Does this actually lift the nose? I would have though it compressed the shock more than lift the nose?

Spru!
E=Mc2
 
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jetmech
Posts: 2316
Joined: Wed Mar 29, 2006 2:14 am

RE: NoseGear Question

Fri Oct 06, 2006 7:42 pm

Quoting Spruit (Reply 6):
Does this actually lift the nose?

If everything is in equilibrium, and there is no loading or unloading going on, in theory, every millimetre you raise the jack will also lift the entire nose landing gear a millimetre as well. This will then also raise the nose of the aircraft.

The landing gear struts contain pressurised nitrogen which supports the weight of the aircraft. When the nitrogen pressure inside the strut (in psi) multiplied by the area of the inner cylinder (in square inches) equals the weight upon the strut in pounds, the strut will neither extend nor shorten.
JetMech split the back of his pants. He can feel the wind in his hair :shock: .
 
Spruit
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Joined: Fri Oct 28, 2005 12:34 am

RE: NoseGear Question

Fri Oct 06, 2006 7:44 pm

Quoting JetMech (Reply 7):
If everything is in equilibrium, and there is no loading or unloading going on, in theory, every millimetre you raise the jack will also lift the entire nose landing gear a millimetre as well. This will then also raise the nose of the aircraft.

Good point, well made, my question seems quite obvious now you've posted this?!

Thanks,

Spru!
E=Mc2
 
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HAWK21M
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RE: NoseGear Question

Fri Oct 06, 2006 9:04 pm

Quoting Spruit (Reply 6):
I would have though it compressed the shock more than lift the nose

The Nose Gear is def lifted after the Strut is compressed a certain extend.
regds
MEL
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