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« on: January 24, 2017, 09:38:06 pm »
One of the reasons that the LAA require an inspectors look over is, for a fresh set of eyes to do a secondary inspection, to avoid inadvertent transmission of an erroneous HEX code. This wrong code transmission has the potential of "over transmission " of a real allocated HEX code from another aircraft. With ADS-B out position about to overtake radar surveillance outside CTA's and other congested Controlled airspace then there's a good potential for misidentification.
When my mode S transponder was installed, the HEX code was left at factory fit of all the zero's. The Funke handbook talked about 24 bit but had no reference to the 6 digit HEX code and how that was set up. So one test flight later, I asked the local ATC centre to confirm my mode S output and had an affirmative answer, so all was well or so I thought - I'd leave the HEX code till later.
Anyway one wigging letter from OFCOM later I did a full set up and the correct codes eventually sorted
out.
That said I would expect that some inspectors know less about this system than some of the installers.
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