WWhiskey(aviation letter code) WWarden WWarrant(securities/stocks; like an option) WWarrant(Officer) WTungsten WWaiver WWeiblich(German: Female) WWavelength WTungsten(atomic symbol) WWicket WTryptophan(amino acid) WWaco Aircrcraft Company(manufacturer's symbol; Troy, OH) ...
including an HSI and area navigation. I flew that airplane for about two years and 1,000 hours and was pretty fond of it. It would, in fact, do everything that a TBM 930 will do except fly high and fast and far.
Except in the case of avionics equipment, however, where designs are evaluated and certified by the Federal Aviation Administration (FAA), such testing does not necessarily cover all the same operating parameters nor rise to the level of fidelity required for formal "certification." Why is that?