sentences:  Based on its observations, the NTSB recommended to the FAA that design changes be implemented to improve the noticeability of TCAS announcements, and that the FAA advise pilots of all aircraft types to familiarize themselves with the details of this accident, with the ways in which a pilot could inadvertently cause the loss of transponder and/or TCAS function, and how to recognize a loss of function.On 10 December 2008, more than two years after the accident, CENIPA issued its final report, describing its investigation, findings, conclusions and recommendations.The CENIPA report includes a "Conclusions" section that summarizes the known facts and lists a variety of contributing factors relating both to air traffic controllers and to the Legacy jet's flight crew.