According to the install manual for the 600exp:
1.3 Regulatory Compliance
The ADS600-EXP UAT complies with section 3 requirements of TSO-C154c and when installed in accordance with the installation instructions of this document complies with the aircraft requirements of 14 CFR 91.227.
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This is typical of what uninformed (I mean me) owners have to put up with.
Section 3? Is there a section 1 or 2? Do they matter?
"aircraft requirements"? Most of 91.227 seems to deal with GPS requirements. Do they not matter?
Why can't a manufacturer put down, in writing, "This meets all FAA requirements"?