Bill, The 2D minimum edge distance can also be found in the US Army Aviation publication "Basic Aircraft Repair" and is referenced in Advisory Circular AC 43.13-1B paragraph 4.57 c. It's standard practice.
Thanks, Dave --- In [email protected], thesu...@... wrote: > > Maybe I can add a little with regard to minimum edge distance:? First, I > would suggest that honoring minimum edge distance values is generally routine > in the > fabrication and repair of all types of aluminum aircraft and the reported > Boeing rule is right in line with what I have seen elsewhere. The Jeppesen > book "Aircraft Sheet Metal" gives a minimum edge distance of 2D.? "Aircraft > Structural Technician" written by Dale Hurst provides a 2D minimum edge > distance value but additionally gives a 2.5D value for countersunk rivets.? A > minimum edge distance value of 2D can also be found in AC 43.13.? I'm not > sure how Boeing defines their rule, but for these other three references, the > distance is measured from the center of the hole to the edge of the material. > > > > > > > > I think that these values are typically taken to apply to flat materials.? > I'm not sure how these guidelines might fit the more complex cross sectional > geometry of our spar caps. > > > > > > > > Cheers, > > > > Bill > > > > > > > > > > > > > > > > > > > > > William Bayne said:? I would be reluctant to attempt to apply such a rule > directly > > > > > > > to light aircraft. >
