The latest flip-flop (allbeit a minor one.)
The "wise instruction" (as described by the society) given is that sisters now have to wear head coverings when interpreting sign language public talks.
Differs from the previous instructions that sisters didn't need to do so.
w02 7/15p.27 Questions From Readers
Must Christian women wear a head covering when giving oral or sign-language translation of Bible discourses or when publicly reading the paragraphs from a Bible study aid that is being used at a congregation meeting? No. Sisters handling these duties are not presiding or teaching. Similarly, no head covering is required for sisters taking part in demonstrations, relating experiences, or handling student talks in the Theocratic Ministry School.
w77 6/15p.28 Questions From Readers
When a sister is interpreting for the deaf,would Paul’s counsel at 1 Corinthians 11:3-16 make it necessary for her to cover her head?
Since the sister serving as interpreter would not be originating the thoughts expressed, she would not be teaching in the congregation so as to require a head covering. She would be just relaying information in another language, in this case the sign language.