Brief Description: Installing the wings for the last time.
This is what I wrote to Vans a few days ago.
Hi Gus, I suspect that the wing spar bolts are torqued with shear values instead of tension values? The nuts that are called out on the drawing are AN365 which are usually called out on the torque charts as being used for tension applications and the AN364 being used for shear applications which brought me to question the torque. Are the bolts torqued in sheer 300/400 in/lbs as called out in the NAS torque tables? How are builders holding the lower outboard nut when applying torque to the bolt head? There is not much room around the gear weldment (rv-7a) to get a wrench on it. Perhaps I need to modify a wrench? Any tips are appreciated.
Vans responed with this.
We use the standard AN365 values from Sect 5: 450-500 for the 7/16, 50-70 for the 1/4. Always use those unless the manual specifies others. You'll need to grind down a cheap wrench to fit on the inaccessible nuts, or a flat screwdriver wedged between the nut and weldment can hold them still.
...And that is what I did when installing the wings for the final time with the help of Roger. We installed the wings per Sec 8-14 of the manual and using the hardware called out on drawing 11. I used some motor oil on the bolts as called out in the builder's manual.
