Originally Posted by Machsandy
...so Kyle, if you are back from Blighty then if you could send the measurements that would be a big help in minimising the number of random holes we need to drill!
OK, these measurements are from my airplane, but I assume that due to the matched hole construction, the variation shouldn't be much from plane to plane.
The step bolt access holes in the belly are located:
- 2 1/16" aft of the edge of the F-1076 belly skin.
- 1/2" inboard of the edge of the F-1070 side skin (where it is rolled to the belly of the airplane).
The step bolt access holes in the baggage compartment are located:
- 3 5/16" aft of the centerline of the row of rivets which secures the piano hinges for the rear seats.
- 8 11/16" outboard of the rivet line where the F1020 ribs attach to the baggage compartment floor.
Before I drilled anything, I'd very carefully eyeball the proposed location of the holes against the physical location of the steps just to make sure the locations I provided make sense.
After that, I'd drill each of the holes to 1/8" first, then adjust the location with a file if necessary, and drill to final size. (The final size on mine is 5/8")