Water Pickup

[SnoC653]

If you think they might have been 7075 pore a little ammonia on the plate, if it turns black there's a lot of zinc and is most likely 7075.

Well they aren't 7075 then. I put ammonia and soaked the area between the turnbuckle pads and no black. The plates were painted black and you can see the doubler was also. Paint is worn off/polished off the doubler.

Here is a picture of the crack itself. You can see where it ran along the pressure line from the turnbuckle pad and then started heading to the front edge. This is the bottom of the plate.