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.

Airlines are attempting to increase avionics functionality through upgrades.

If present trends continue, no airline pilot will fly without a tablet computer; nor will any aircraft mechanic attempt a repair without one. For the pilot, the devices represent the latest evolution in electronic flight bags (EFBs), which first made inroads, nearly two decades ago via the laptop computer. For mechanics, the far less bulky tablets will provide a new measure of mobility, as digital maintenance manuals can be downloaded and taken where the work is being done.