Based on your research, are these headsets a benefit or risk to aviation safety? What are the major issues/concerns about using them in the cockpit? How can we mitigate the possibility that the pilot may be unaware of environmental sounds and audible warning annunciations in the cockpit that do not come through the intercom system (consider types of uncertified equipment)? What do you see as the biggest challenge for an aircraft maintenance manager in the use and operation of noise-cancelling headsets in the cockpit? How do you ensure that noise-cancelling headsets are properly certified to ensure proper functionality to receive environmental sounds and audible warnings