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I was just speaking with an experienced and well-regarded avionics installer, asking about installing the L3 ESI-500 as a backup AI to my Aspen PFD and removing my vac system later this year. He had done such installs but said he was no longer doing them. His reason was that the legality of the L3 as a backup to an Aspen single panel pfd had recently been questioned (by the FAA?), and there was now an ongoing dispute between L3 and Aspen on this issue. It seems odd because the two companies have an ongoing product development partnership, with the L3 products even advertised on Aspen's website. I emailed Aspen customer support about it and will report back if they respond. I hope this post doesn't cause undue stress by spreading fake news ! Does anyone else have info on this question? It's a potential headache for people who already have the L3. I have no info on anything other than using the L3 to back up the Aspen single panel pfd, and that info is second hand. However, for anyone considering putting in the ESI-500 as backup now, it may be worth digging a little deeper into the question.
