What’s up with the jack stands?

[Ed Coffman]

Here is one of our aircraft on jacks. We just leave the jackpads on all the time.

[Trippster]

Originally Posted by Ed Coffman

Here is one of our aircraft on jacks. We just leave the jackpads on all the time.

Ed,

Thanks for the pictures. Your jack pads are the same as the old ones we had before we bought the yellow Bogert pads. I'm also glad to see that the location of your pads is the same as ours. We may try putting the old pads back on and see how they line up with the jacks. This is really strange.

[JAG]

Tripp,
I would recommend looking inside the wing at the structure before you jack again. Something does look right in the first picture you uploaded how the jack pad is at an angle. Just a thought.
Jeff

[CO_Skymaster]

I'm planning to purchase some jack stands for my 337A, so I can rotate the gear and get to the nose strut pressure inlet so I can charge it. I know where the jacks on the wings go, but what are all of you using to support the tail and if it is another type of jack, do I need two for both tail booms. I am nervous about doing this, although I suspect after doing it a few times it will get better, but are there any procedures I should know about before trying it?

Karl

[edasmus]

Just came from my shop as my plane is getting it's annual inspection. My plane is on jacks per the photo. Only the co-pilot side boom is supporting the tail. There is no jack on the other boom. This is my 20th annual inspection with this shop. I have never seen both booms supported. Just my experience but I do not know for certain what the accepted practice is.

FYI, 58 pumps to manually extend the gear.

[CO_Skymaster]

Thanks for the picture. I know about the hard points on the wings, by the strut. How is that third jack attached to the boom? Is it tied down through the tie down bolt, or is it sitting on top? The third one doesn't look like the same type of jack stand. That third jack location and how it sits is what I'm wondering about.

Karl

[Kim Geyer]

We had the Cessna pads on the wings and the stayed installed. We had 2 under hoist safety stands from harbor freight that the tail boom would just sit on. When they are on jacks there is only about 50 lbs of weight on the tail stands. There is a third jack point just behind the nose gear door and you really must put a short jack there or it’s very easy for the plane to nose over if you look at Ed Coffman’s post and zoom in you can see the tail stands and the nose jack

[wslade2]

For tailboom I took a countour copier from hardware store and made replica of underside of boom at the support location. I then test fitted cardboard template from that. I used the cardboard to draw a cutout on multiple squares of plywood. Ended up with about a 3 inch thick “U” of plywood that I then throughbolted some 2x4 legs. I lined the “U” with some foam rubber doormat. I made the whole set up short enough that I could put a hydraulic jack underneath it. Made two of these, one for each boom. Jacked them up with the plane.there was some running around from jack to jack. Did have to put some blocks underneath due to not enough reach of the jacks, so be ready for that.

The plane will try to tilt backwards as you raise the underwing jacks. I use the bogert jack adapters on the spar jackpoint screw hole at the wing. And yes there is jack point ball on belly behind nosegear.