Originally Posted by
btwissel
technical service order
basically the FAA has given the thumbs up on the headset as it meets a certain set of criteria. technically speaking, we're not supposed to use non-TSO headsets in the 121 environment.
of course, if the FAA actually enforced this, half of the airline pilots in the US would be without a headset.
Not true! From the FAA themselves the TSOed headset is NOT a requirement. It is solely the judgement of an individual carrier to determine if they require you to use a TSOed headset or not. Some do, many don't.