dlramp4life
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747 Towbar Question...

Thu Aug 02, 2012 12:24 am

I came across this picture from DEN.. While looking at the picture I got confused because the towbar looks to long and skinny for a 747, looks a 757 towbar...



Every 747 towbar I have seen is short and fat like this one
http://www.aerogse.com/product_images/l/15F2342-Aircraft-Towbar-B747-1.jpg

How can this towbar push a 747? I thought every widebody towbar what short in length and wide in width to help with the narrow turn radius... Any thoughts?
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tdscanuck
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RE: 747 Towbar Question...

Thu Aug 02, 2012 3:01 am

Quoting dlramp4life (Thread starter):
How can this towbar push a 747?

F=ma. As long as the towbar hooks up and the tug driver doesn't bust the shear fitting, you push almost anything with anything.

Quoting dlramp4life (Thread starter):
I thought every widebody towbar what short in length and wide in width to help with the narrow turn radius... Any thoughts?

There are short fat ones and long skinny ones; the major meaningful difference between towbars is the shear fitting. You can always use a weaker towbar (e.g. 757 towbar on a 747) as long as the tug driver knows what they're doing and the discrepancy isn't too large. You can go the other way (e.g. 747 towbar on a 757) but you run a non-trivial risk of damaging the landing gear if you do that.

Tom.
 
ak907
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RE: 747 Towbar Question...

Thu Aug 02, 2012 5:38 am

That picture of the yellow tow bar is the same one we have at work. Great model btw. A longer tow bar makes it easier to keep the nose wheel straight, because of the further distance between the two points. Also, in your example, the 747 uses a different connector than other planes. Most planes, from I know including the 757, 767, 777, MD10 and MD11, use a bar and clamp type system, while the 747 uses a two hole and two pin type system. The two are not interchangeable. Shear pins are just regular bolts designed to break at a specific force. Most tow bars have two shear bolts. Attached is a picture of the same towbar. http://www.airliners.net/uf/163172/phpmgWCXp.jpeg
 
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HAWK21M
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RE: 747 Towbar Question...

Sat Aug 04, 2012 10:14 am

Thats an optional towbar...As long as its approved for the type & loads encountered , it should work fine.
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AA737-823
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RE: 747 Towbar Question...

Sat Aug 11, 2012 11:00 am

The one we used to push 747F's was much longer than even the top one you've pictured.
Built like a tank, too.... made things nice n easy, and visible.
The shorter the towbar, the closer you are to the skin of the 747 nose, which reduces visibility.
 
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HAWK21M
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RE: 747 Towbar Question...

Sat Aug 11, 2012 11:15 am

Quoting AA737-823 (Reply 4):

The shorter the towbar, the closer you are to the skin of the 747 nose, which reduces visibility.

Also gets the fuselage nearer the Tow truck,can be critical in case of smaller Aircraft like A320/B737s.
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dlramp4life
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RE: 747 Towbar Question...

Sat Aug 11, 2012 7:27 pm

But the turning radius of a widebody is not that big, you really don't have to turn the plane far before "redline" the nose gear. A smaller towbar on a widebody gives the driver better control of the aircraft.
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HAWK21M
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RE: 747 Towbar Question...

Sun Aug 12, 2012 11:00 am

Quoting dlramp4life (Reply 6):
A smaller towbar on a widebody gives the driver better control of the aircraft.

In comparison.....the TBL is the best as long as the Brakes are not jammed during pushback,then the Towbar is preffered  
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AA737-823
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RE: 747 Towbar Question...

Sun Aug 12, 2012 11:50 am

Quoting dlramp4life (Reply 6):

But the turning radius of a widebody is not that big, you really don't have to turn the plane far before "redline" the nose gear. A smaller towbar on a widebody gives the driver better control of the aircraft.

Having pushed both 747s and 737s, I disagree. A short towbar doesn't do anything for me.
Maybe it's just personal preference.
 
DC8FriendShip
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RE: 747 Towbar Question...

Tue Aug 14, 2012 5:03 pm

The lencth of the towbar makes a negligable difference on an aircraft that size. Try towing a Cessna with a towbar longer than the wheelbase, Thats a Challenge!

BTW the 747 can be towed from either fwd or aft sides of the nose gear.
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CALTECH
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RE: 747 Towbar Question...

Fri Aug 17, 2012 5:51 pm

B-52 towbars were some of the longest IIRC, about 47 feet long or so.

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HAWK21M
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RE: 747 Towbar Question...

Sat Aug 18, 2012 5:13 pm

Quoting CALTECH (Reply 10):
mes:

B-52 towbars were some of the longest IIRC, about 47 feet long or so.

Remember the AN124 tow bar....in two pieces.
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CALTECH
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RE: 747 Towbar Question...

Sat Aug 18, 2012 6:00 pm

Quoting HAWK21M (Reply 11):
Remember the AN124 tow bar....in two pieces.

Oh yeah. Another monster towbar.

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HAWK21M
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RE: 747 Towbar Question...

Tue Aug 21, 2012 10:23 am

The AN124 folks need a team to assemble.....Pushback .....Disconnect....Disassemble....Reload back into the Aircraft ....close the Aft ramp door & taxi out......
The Towbar is carried on board.....
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