Software upgrades, for the most part, are now an on-wing proposition. But, as Mitch Klink of the Avionics Maintenance Conference explains, all software modifications—and the media/hardware to transfer them—should conform to the baseline version of the Arinc 615 protocol to allow the use of portable data-loaders for on-wing applications. He cautions that, often when these upgrades are performed on-wing, the LRUs containing the new software versions become non-interchangeable with the LRUs containing the previous software versions.
