Then you should probably call the FAA.
However I deal with them a fair amount.
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is the TEA certificate valid also with an FAA license?
You would have to ask the TEA people. I can't see why having a pilot certificate from the FAA would invalidate a language certification from TEA.
Are you asking if the FAA recognizes a TEA certificate? The answer would be no. When you take the checkride with the Inspector/Examiner, one of the things they check is that you are able to communicate in English. They don't perform a separate English test but if you do not understand their questions and are not able to form answers, you will not pass the checkride.
the FAA recognize the TEA certificate and instead of just saying 'English proficient' can they change it with a level 6?
Are you asking if the FAA can change what is on your certificate
to a level 6 if you have a certificate from TEA? Again, the answer would be no. All the FAA puts on the certificate is "English Proficient." You either are or are not.
S