Dear fellowcountryman marciovp,
The conclusions you are waiting for:
(...)
3. The occurrence of problems or functional failures in the software installed in the Air Traffic Control System, was not characterized, at the time of the accident;
4. The flight rules for Brazilian Air Space are correct by international standards, as prescribed by the International Civil Aviation Organization (ICAO);
5. The Air Traffic Control radiocommunication system, from an exclusively technical aspect, did not present failures, because other aircraft that flew over the region of the accident, including some close to the Legacy N600XL, did not have any communication problems; that the Legacy did not manage to communicate with ACC-Brasilia is linked to the use of differing frequencies on the part of the pilots and of some foreseen frequencies not being programmed in the console that controlled the Sector in which the aircraft flew;
6. The communications problems between controllers and pilots that occurred when the Legacy aircraft was cleared for takeoff, at the São José dos Campos Aerodrome, were not due to the low technical quality of the transmission, nor to the incorrect or deficient use of the English language in communication with the pilots: it was, essentially, due to the incorrect form in which the content was transmitted, which does not signify that there should not be investment in improvement of the flight controllers’ conversational English;
7. There were no incorrect indications nor the appearance of unknown signals on the radar screens of the air traffic controllers’ consoles; this does not indicate, however, that there does not exist the possibility of improving the system, such as by the inclusion of audio alerts to indicate exceptional circumstances;