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747 Towbar Question...  
User currently offlinedlramp4life From United States of America, joined Jun 2011, 927 posts, RR: 1
Posted (1 year 11 months 4 weeks 2 hours ago) and read 7766 times:

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?


PHX Ramp, hottest place on earth
13 replies: All unread, jump to last
 
User currently offlinetdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 1, posted (1 year 11 months 3 weeks 6 days 23 hours ago) and read 7705 times:

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.


User currently offlineak907 From United States of America, joined Mar 2012, 42 posts, RR: 0
Reply 2, posted (1 year 11 months 3 weeks 6 days 20 hours ago) and read 7645 times:

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

User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 3, posted (1 year 11 months 3 weeks 4 days 16 hours ago) and read 7180 times:

Thats an optional towbar...As long as its approved for the type & loads encountered , it should work fine.


Think of the brighter side!
User currently offlineAA737-823 From United States of America, joined Mar 2000, 5722 posts, RR: 11
Reply 4, posted (1 year 11 months 2 weeks 4 days 15 hours ago) and read 6552 times:

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.


User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 5, posted (1 year 11 months 2 weeks 4 days 15 hours ago) and read 6552 times:

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.



Think of the brighter side!
User currently offlinedlramp4life From United States of America, joined Jun 2011, 927 posts, RR: 1
Reply 6, posted (1 year 11 months 2 weeks 4 days 7 hours ago) and read 6501 times:

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.


PHX Ramp, hottest place on earth
User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 7, posted (1 year 11 months 2 weeks 3 days 15 hours ago) and read 6407 times:

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  



Think of the brighter side!
User currently offlineAA737-823 From United States of America, joined Mar 2000, 5722 posts, RR: 11
Reply 8, posted (1 year 11 months 2 weeks 3 days 14 hours ago) and read 6400 times:

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.


User currently offlineDC8FriendShip From United States of America, joined Apr 2005, 242 posts, RR: 3
Reply 9, posted (1 year 11 months 2 weeks 1 day 9 hours ago) and read 6211 times:

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.



Come fly the Friendly Skies of United
User currently offlineCALTECH From Poland, joined May 2007, 2189 posts, RR: 25
Reply 10, posted (1 year 11 months 1 week 5 days 8 hours ago) and read 5967 times:

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




UNITED We Stand
User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 11, posted (1 year 11 months 1 week 4 days 9 hours ago) and read 5843 times:

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.



Think of the brighter side!
User currently offlineCALTECH From Poland, joined May 2007, 2189 posts, RR: 25
Reply 12, posted (1 year 11 months 1 week 4 days 8 hours ago) and read 5829 times:

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

Oh yeah. Another monster towbar.




UNITED We Stand
User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 13, posted (1 year 11 months 1 week 1 day 16 hours ago) and read 5558 times:

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.....



Think of the brighter side!
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