Originally Posted by
Hossharris
Technically the headsets and hand mike the company puts in the jet have to be TSO ... and are always there as a backup should your non-TSO headset fail.
That being said, the company can be more restrictive. Delta requires TSO headsets if you bring your own.
IANAL, but I think at those times the company requires you to wear a headset (below 18k for us), I would think it has to be TSO even if you had a backup, and the company has nothing else published.