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How Many Jacks Needed To Jack Up A 747  
User currently offlineXms3200 From Sweden, joined Apr 2005, 109 posts, RR: 0
Posted (6 years 1 week 2 days 6 hours ago) and read 4865 times:
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I was wondering how many jacks are needed to jack up a 747 (all models) off the ground for a gear swing. i know on the 737's, 3 are needed, and the nose jack is installed after all jacking operations are done, mostly as a secondary jack.

Thanks for all replies.

6 replies: All unread, jump to last
 
User currently offline474218 From United States of America, joined Oct 2005, 6340 posts, RR: 9
Reply 1, posted (6 years 1 week 2 days 6 hours ago) and read 4859 times:



Quoting Xms3200 (Thread starter):
I was wondering how many jacks are needed to jack up a 747

I have never seen more than three! Two (wing) jacks and one (1) nose jack.


User currently offlineJetMech From Australia, joined Mar 2006, 2699 posts, RR: 53
Reply 2, posted (6 years 1 week 2 days 2 hours ago) and read 4810 times:

Quoting Xms3200 (Thread starter):



Quoting 474218 (Reply 1):
I have never seen more than three! Two (wing) jacks and one (1) nose jack.

I agree that three is the usual (minimum) number of jacks used, but if it is a 747, it would be two wing jacks and a tail jack. The wing jacks are located under the forward spar of the wing centre section, thus, to maintain balance; a tail jack must be used. The 767 / 777 are similar. A nose-jack can be used if desired, but this is for additional stability only. As far as I know, Airbus is different. The main jacks are located towards the trailing edge of the wing, so a nose jack is used to maintain balance.


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Regards, JetMech

[Edited 2008-11-18 20:13:07]


JetMech split the back of his pants. He can feel the wind in his hair.
User currently offline474218 From United States of America, joined Oct 2005, 6340 posts, RR: 9
Reply 3, posted (6 years 1 week 2 days 2 hours ago) and read 4797 times:



Quoting JetMech (Reply 2):
I agree that three is the usual (minimum) number of jacks used, but if it is a 747, it would be two wing jacks and a tail jack. The wing jacks are located under the forward spar of the wing centre section, thus, to maintain balance; a tail jack must be used. The 767 / 777 are similar. A nose-jack can be used if desired, but this is for additional stability only.

Thanks for the clarification. I thought that the tail jack on the 747 was for stabilization, not the front. You learn something new every day.


User currently offlineAogdesk From United States of America, joined Jun 2004, 935 posts, RR: 3
Reply 4, posted (6 years 1 week 1 day 14 hours ago) and read 4693 times:

The task isn't actually limited to Jacks......it can be Toms, Bobs or Georges too......the maintenance manual doesn't specify.

I'm sorry, I need to get a life.  Smile


User currently offlineBAe146QT From United Kingdom, joined Sep 2006, 996 posts, RR: 0
Reply 5, posted (6 years 1 week 1 day 13 hours ago) and read 4675 times:

Did any of you ever see that programme (it was on UK terrestrial TV recently but probably came from Discovery originally) where they dismantled a 747?

It was the first one these guys had done - they were used to smaller birds - and if I remember correctly they used no less than four jacks and two fixed stands (one jack and one stand under each wing, one jack at the front, one jack at the rear). Having done this, they balanced the whole thing on stacks of railroad ties then deflated the jacks and unwound the stands and pulled them away - while running like hell.

I don't know whether they used so many beause they were being cautious or what.

On a further note, my new cat is called Jack. He's about a foot tall and weighs 12.5 pounds. I don't know how many of him you'd need to 'jack' up a 747 but I bet it's more than four.



Todos mis dominós son totalmente pegajosos
User currently offlineDALMD88 From United States of America, joined Jul 2000, 2603 posts, RR: 15
Reply 6, posted (6 years 1 week 1 day 12 hours ago) and read 4646 times:

Wow, jacking a 777 outside. I know it is legal, but... Wouldn't feel very comfortable doing it. I guess the wind doesn't blow much there.

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