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Hydraulic Lifts For Planes, How Do They Work?  
User currently offlineSXDFC From United States of America, joined Dec 2007, 2881 posts, RR: 15
Posted (7 years 5 months 1 week 4 days 22 hours ago) and read 10148 times:

In many MX pictures on this site, and else where I have seen planes on hydraulic lifts under the wing and on the side of the plane. I would like to know how these devices work, especially the ones that are placed on the side of the plane. Is it a powered magnet that attaches to the skin of the plane?

ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.
4 replies: All unread, jump to last
User currently offlineTristarSteve From Sweden, joined Nov 2005, 4354 posts, RR: 33
Reply 1, posted (7 years 5 months 1 week 4 days 22 hours ago) and read 10139 times:

I think you are talking about jacks, where the aircraft is jacked off the wheels for maint.
The jacks fit into special jacking pads. These are usually fitted by removing a panel and bolting the pad onto the aircraft. Sometimes there is no panel to remove at the nose. The six bolt holes are filled with plastic inserts that are removed. The jacking pads are kept with the jacks and are special for each aircraft type.

User currently offlineDALMD88 From United States of America, joined Jul 2000, 2890 posts, RR: 14
Reply 2, posted (7 years 5 months 1 week 4 days 21 hours ago) and read 10135 times:

For the nose jacks on planes like a 757/767 the jack mount fixture is screwed into mount holes on the side of the plane. When not is use the holes are plugged with flush screws. The jack mounts for the wing jacks screw into similar holes under the wing. Some aircraft, like the MD80 use this type for the nose and tail also. Magnets wouldn't work too good. Aluminum structure isn't very attracted to magnets.

The jacks themselves are actuated by shop compressed air. You simply step on the lever and they slowly pump up. Just like a pump type bottle jack you might use on a car. Care must be taken when jacking that the plane goes up level. There are bubble gages mounted in the wheel wells to show the condition.

User currently offlineHAWK21M From India, joined Jan 2001, 31875 posts, RR: 54
Reply 3, posted (7 years 5 months 1 week 4 days 19 hours ago) and read 10072 times:

View Large View Medium
Click here for bigger photo!

Photo © Wenzai

Sounds like you are reffering to aircraft hydraulic jacks.
These are hydraulically operated,screw jack ring locked at small intervals of lift to cater to a loss of fluid.
Placed at four points around the aircraft "normally".
There is a level plumb bob/spirit level in MWW normally used to monitor the jacking process to ensure equal mvmt.

[Edited 2008-12-17 12:49:53]

Think of the brighter side!
User currently offlineKELPkid From United States of America, joined Nov 2005, 6833 posts, RR: 3
Reply 4, posted (7 years 5 months 1 week 4 days 18 hours ago) and read 10038 times:

Quoting SXDFC (Thread starter):
Is it a powered magnet that attaches to the skin of the plane?

That wouldn't work on an airplane. Aluminum (and its alloys, as used in aviation) aren't magnetic materials  Wink

Celebrating the birth of KELPkidJR on August 5, 2009 :-)
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