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NTSB issues TCAS safety recommendations after Brazil mid-air
3 May 2007

Preliminary findings in the 2006 mid-air collision between a Legacy jet and a GOL Boeing 737-800 prompted the NTSB to issue 3 safety recommendations to the FAA:
1) Require, for all aircraft required to have a traffic alert and collision avoidance system installed and for existing and future system designs, that the airborne loss of collision avoidance system functionality, for any reason, provide an enhanced aural and visual warning requiring pilot acknowledgment; 2) Evaluate the feasibility of providing enhanced aural and visual warnings for future
systems that may provide ground collision avoidance functionality. If feasible, require that future design criteria include such warning functionality; 3) Inform all pilots who use transponders or transponder/traffic alert and collision avoidance system (TCAS) units about the circumstances of this accident and the lack of a
conspicuous warning to indicate the loss of collision protection resulting from a compromise in functionality of either the transponder or TCAS unit and ask all pilots
who use transponders or transponder/TCAS units to become familiar with the annunciations currently used to indicate failure or lack of active functionality of these
components. (NTSB)