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NoseGear Question  
User currently offlineHighflyer9790 From United States of America, joined Jul 2005, 1241 posts, RR: 0
Posted (8 years 3 weeks 6 days 15 hours ago) and read 1643 times:

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
9 replies: All unread, jump to last
 
User currently offlineEMBQA From United States of America, joined Oct 2003, 9364 posts, RR: 11
Reply 1, posted (8 years 3 weeks 6 days 15 hours ago) and read 1638 times:

Nose steering actuators...


"It's not the size of the dog in the fight, but the size of the fight in the dog"
User currently offlineHighFlyer9790 From United States of America, joined Jul 2005, 1241 posts, RR: 0
Reply 2, posted (8 years 3 weeks 6 days 15 hours ago) and read 1622 times:

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

not sure i follow you on that one...



121
User currently offline474218 From United States of America, joined Oct 2005, 6340 posts, RR: 9
Reply 3, posted (8 years 3 weeks 6 days 14 hours ago) and read 1607 times:

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.

User currently offlineFr8Mech From United States of America, joined Sep 2005, 5520 posts, RR: 14
Reply 4, posted (8 years 3 weeks 6 days 13 hours ago) and read 1589 times:

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.
User currently offlineSfomb67 From United States of America, joined Dec 2005, 417 posts, RR: 0
Reply 5, posted (8 years 3 weeks 6 days 10 hours ago) and read 1560 times:

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
User currently offlineSpruit From United Kingdom, joined Oct 2005, 375 posts, RR: 0
Reply 6, posted (8 years 3 weeks 6 days 5 hours ago) and read 1514 times:

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
User currently offlineJetMech From Australia, joined Mar 2006, 2699 posts, RR: 53
Reply 7, posted (8 years 3 weeks 6 days 4 hours ago) and read 1497 times:

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.
User currently offlineSpruit From United Kingdom, joined Oct 2005, 375 posts, RR: 0
Reply 8, posted (8 years 3 weeks 6 days 4 hours ago) and read 1497 times:

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
User currently offlineHAWK21M From India, joined Jan 2001, 31692 posts, RR: 56
Reply 9, posted (8 years 3 weeks 6 days 3 hours ago) and read 1465 times:

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



Think of the brighter side!
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