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Subject: Unapproved Parts - Sign Offs?
Content: I recently came across a Hawker with an entertainment system installed (3 displays, cd/dvd player and an audio system that included a 6 place wireless system).  Problem is, the parts are non-aviation approved (more like a Best Buy special).  To make it worse, there is no sign off of any sort in the logbooks, equipment list or w&b. The aircraft is operated Part 91.  Can these parts be installed?  Under what FAR? If Yes, I would assume a conformance inspection and sign off stating such would be required as well as the equipment and w&b. Thoughts or Recommendations? Bill