In the sometimes chaotic audiotape from the air traffic tower, the pilot of the British-built jet could be heard repeatedly requesting permission to land due to a "total electric failure" and lack of fuel, before slamming into a mountainside late Monday.
A female controller could be heard giving instructions as the aircraft lost speed and altitude about eight miles from the Medellin airport. Just before going silent the pilot said he was flying at an altitude at 9,000 feet.
These, along with the lack of an explosion upon impact, point to a rare case of fuel running out as a cause of the crash of the airliner, which experts say was flying at its maximum range.
For now, authorities are avoiding singling out any one cause of the crash, which killed all but six of the 77 people on board, including members of Brazil's Chapecoense soccer team traveling to the Copa Sudamericana finals.
Alfredo Bocanegra, head of Colombia's aviation agency, said that while evidence initially pointed to an electrical problem, the possibility the crash was caused by lack of fuel has not been ruled out.
Planes need to have enough extra fuel on board to fly at least 30 to 45 minutes to another airport in the case of an emergency, and rarely fly in a straight line because of turbulence or other reasons.
It is also possible the pilot dumped fuel, or a lack of fuel was caused by a leak or some other, unexplained reason. "If this is confirmed by the investigators it would be a very painful because it stems from negligence," Bocanegra told Caracol Radio today when asked whether the plane should not have attempted such a long haul.
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