page_title: Gol Transportes Aéreos Flight 1907
section_title: Embraer flight and communication sequence
hierarchical_section_title: Gol Transportes Aéreos Flight 1907 / Investigation / Embraer flight and communication sequence
caption_attribution_description: English: Boeing 747-400F, fleet of Polar Air Cargo. Registration: N453PA Place: Narita International Airport 日本語: ポーラーエアカーゴのボーイング747-400F(N453PA)。
context_page_description: Gol Transportes Aéreos Flight 1907 was a Boeing 737-8EH on a scheduled domestic passenger flight from Manaus, Brazil, to Rio de Janeiro. On the afternoon of 29 September 2006, it collided in mid-air with an Embraer Legacy 600 business jet over the Brazilian state of Mato Grosso. The Boeing 737 broke up in mid-air and crashed into an area of dense jungle, killing all 154 passengers and crew on board. Despite sustaining serious damage to its left wing and tail, the Embraer Legacy jet landed safely with its seven occupants uninjured.
  The accident was investigated by the Brazilian Aeronautical Accidents Investigation and Prevention Center and the U.S. National Transportation Safety Board, and a final report was issued in 2008.
context_section_description: The Embraer took off from São José dos Campos at 14:51, reaching FL370 at 15:33, 42 minutes later, where it remained until the collision.
  ATC maintained normal two-way radio contact with the Embraer up until 15:51, when the last successful radio exchange with the Embraer was made on VHF frequency 125.05 MHz with Brasília Center. At that point the Embraer was just approaching the Brasília VOR. The Embraer overflew the Brasília VOR at 15:55, four minutes later, and proceeded northwest-bound along UZ6. At 16:02, seven minutes after crossing the Brasília VOR, secondary radar contact was lost with the Embraer, thus stopping the display of the Embraer's reported altitude (Mode C) on the controller's radar screen.
  No attempt was made by either the Embraer or Brasília Center to contact each other from 15:51 until 16:26 when, 24 minutes after the loss of secondary radar contact, Brasília Center called the Embraer and received no reply.
  Brasília Center then unsuccessfully attempted to contact the Embraer six more times, between 16:30 and 16:34. At 16:30, the Embraer's primary radar target became intermittent, and disappeared completely from the radar screen by 16:38, eight minutes later. Brasília Center unsuccessfully attempted to effect a handoff of the Embraer to Amazonic Center at 16:53, by calling the Embraer in the blind.
  The Embraer, on the other hand, started calling Brasília Center, also unsuccessfully, from 16:48 and continued with twelve more unsuccessful attempts until 16:53. Some limited contact was made at that point, but the Embraer was unable to copy the Amazonic Center frequencies. The Embraer then continued its attempts to reach Brasília Center, seven more times until the collision.
  The collision occurred at 16:56:54 BRT (19:56:54 UTC) at FL370, and it was confirmed that neither Traffic Collision Avoidance System (TCAS) system had activated or alerted its respective crew, nor did any crew see the oncoming traffic visually or initiate any evasive action prior to the collision. While both planes were equipped with TCAS, it was later determined that the Embraer's transponder had ceased operating almost an hour earlier, at 16:02, rendering both planes unable to automatically detect each other.
  At 16:59:50, about three minutes after the collision, Amazonic Center started to receive the Embraer's secondary radar reply, with its correct altitude and last assigned code. At 17:00:30 Amazonic Center unsuccessfully attempted to contact the Embraer by radio.
  The Embraer started calling on the emergency frequency, 121.5 MHz, immediately after the collision, but as it was later determined in the CENIPA report, the emergency transceivers in the area were not operational and thus the crew was unable to reach ATC on that frequency.
  At 17:01:06 the Embraer established contact on the emergency frequency with a Boeing 747 cargo aircraft, Polar 71, which attempted to relay to ATC their request for an emergency landing, and continued to provide relay and translation assistance to the Embraer until its eventual landing.
  At 17:18:03 the Embraer contacted the Cachimbo Airport control tower directly to coordinate its emergency landing there, and landed safely at Cachimbo at 17:23:00.
caption: This Boeing 747, (registration number N453PA), operated Polar 71, which helped provide radio relay and translation assistance for the crippled Embraer jet
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