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AirWillie6475
Topic Author
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Joined: Thu Jan 27, 2005 1:45 pm

CRJ200 Question

Wed Mar 16, 2005 8:42 am

I am sorry if this has been asked but I was waiting for a flight and I was watching a crj200 that was about to be pushed back. The tug looked like it was connected to the A/C then suddenly the nose wheel mechanism lifted it self maybe a foot or two and the whole front part of plane moved up. What is that is it the nose gear being armed?
 
ShyFlyer
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RE: CRJ200 Question

Wed Mar 16, 2005 10:06 am

Quoting AirWillie6475 (Thread starter):
What is that is it the nose gear being armed?

Actually, what you probably saw was a type of "Supertug." These tugs eliminate the need for a tow bar by using a cradle that lifts the nosewheel off the ground. Pictured below is a simalar example for bizjets:

In this example, the nose gear of a Citation is placed on the cradle, straps secure the nosegear in place, and away you go!

Some example of "Supertugs."

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Photo © Kevin Trinkle
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Photo © Jay Piboontum



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Photo © Gregg Stansbery
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Photo © Carlos Borda



Example of a traditional "towbar" setup:

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Photo © SilverWingPix

I lift things up and put them down.
 
CRJ200Mechanic
Posts: 200
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RE: CRJ200 Question

Wed Mar 16, 2005 7:23 pm

The one's used for the CRJ can be a pain, because they are battery powered. Here in TUL we have two parking spots at the gates for NW and we get 3 A/C a night. That means we have to move one to remote parking every night and then bring it back in the morning. The battery powered ones weren't meant for such a long haul and tend to die. I end taxing the plane in more often than not. The ramp agents let the tug die on me once and blocked a fedex 727. boy was he unhappy. Tower wasn't too happy either.
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Starlionblue
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RE: CRJ200 Question

Wed Mar 16, 2005 7:58 pm

One of the big advantages of supertugs (which come in all sizes) is that they use the weight of the aircraft for traction. Thus they are particularly suited for slippery ramps found in the winter in, for example, Scandinavia.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
AirWillie6475
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RE: CRJ200 Question

Thu Mar 17, 2005 2:54 pm

Ok since I'm in the topic already, I have always wondered what the difference between the crj100 and 200 is and how can you tell.
 
troubleshooter
Posts: 420
Joined: Mon Feb 07, 2005 5:22 am

RE: CRJ200 Question

Thu Mar 17, 2005 3:24 pm

Main difference are the more powerfull CF34-3B1 engines on the -200. The -100 has the CF34-3A1 engines installed.
http://www.geae.com/engines/commercial/cf34/cf34-3.html
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CRJ200Mechanic
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RE: CRJ200 Question

Thu Mar 17, 2005 4:01 pm

Quoting Starlionblue (Reply 3):
is that they use the weight of the aircraft for traction

Yeah, that is correct, but if the supertug is trying to capture the plane and doesn't have the weight of the aircraft on it yet, it often times gets stuck. That's in our case because we have a smaller one. I'm sure the bigger ones do better.
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lowrider
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Joined: Wed Jun 30, 2004 3:09 am

RE: CRJ200 Question

Sun Mar 20, 2005 9:08 am

It may have been a weight shift as well. As the aircraft gets loaded and the CG moves, the aircraft will rock back on the mains or forward on the nose. The slight tap from the tug may have been all that was needed to over come the friction in the nose strut and allow the tail of the aircraft to settle a little. The nosewheel steering is disarmed for pushback operations and does not affect strut extension.
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HAWK21M
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RE: CRJ200 Question

Sun Mar 20, 2005 12:09 pm

Anyone having a Video Image of this Supertug lifting the Gear.Out here we use Only Towbar types so never noticed a supertug work.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
UAL Bagsmasher
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Joined: Wed Sep 08, 1999 12:52 pm

RE: CRJ200 Question

Sun Mar 20, 2005 11:32 pm

When I get pushed back at the gate to taxi to the hangar, those ElectroTugs have gotten stuck several times due to the glycol on the ramp. They just spin their tires and we go nowhere fast Wink
 
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HAWK21M
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RE: CRJ200 Question

Mon Mar 21, 2005 1:06 pm

Quoting UAL Bagsmasher (Reply 9):
When I get pushed back at the gate to taxi to the hangar, those ElectroTugs have gotten stuck several times due to the glycol on the ramp. They just spin their tires and we go nowhere fast

How Heavy are these ElectroTugs.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
CRJ200Mechanic
Posts: 200
Joined: Fri Feb 18, 2005 5:37 pm

RE: CRJ200 Question

Mon Mar 21, 2005 6:44 pm

Quoting HAWK21M (Reply 10):
How Heavy are these ElectroTugs.

The one I found is very similar to the one we use to push the CRJ. The ones for larger aircraft are much heavier. I will see if I can find info on those.

Weight 6900 lb.
Cradle Capacity 12,000 lbs.
Battery Type Sixteen– 6 volt Deep Cycle x x
Charge Time Full Discharge 8 hr. Average
Empty Speed 5.5 mph Full Load Speed 2 mph
Motor Horsepower (2) 10 hp Maximum Aircraft Weight 100,000 lbs

If you want to see more information go to www.jetporter.com, they have several different types. Hope this helps.
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