![]() Structural strength and flight characteristics are unchanged if the doubler ties into structure properly and the antenna is parallel to the WL This does not affect the weight and balance envelope of the aircraft - same limits apply However, don't confuse the idea that if it came from 43.13 it has to be 'major'.īy definition, "major alteration": (from FAR 1) As 43.13 discusses antenna (and doubler) installations, this is good information. Our local feds are constantly changing how they desire paperwork on the avionics themselves, but the antennas are pretty clear. This was done, as others in the past - whether D&M or Comant antennas - by log book entry only. Looking at the last entry on the post (editor's note: referencing forum thread from ) you mentioned you had installed these antennas in the past and am wondering if you have a description available for the installation of doublers without the cross bracing available. ![]() I have been talking with the local FAA about the installation that Robert Siegfried has shown on the and they are wanting to get a DER involved as to approved data. I am working with a customer that wishes to install the Dorne & Margolin N4-17 VOR Glideslope antenna.
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