Link/Source: http://www.avherald.com/h?article=48c031e2/0001&opt=0 /
"On Aug 21st 2017 Senegal's BEA released their final report in French concluding the probable causes of the accident were:
"Non-Compliance of 6V-AIM with the assigned flight level. The aircraft was at FL350 while the crew had correctly read back to maintain FL340. The captain of 3C-LLY claimed 6V-AIM was descending on them. "
"Only the black boxes could have helped to identify how such a scenario could have developed. However, the black boxes disappeared with the aircraft."
"It is possible that a fault in the air data may have contributed to the mid air collision."
Contributing factors
- An misindication by one or both of the altimeters of 6V-AIM appears plausible.
On Jul 23rd 2015 ATC detected the aircraft at FL310 instead of assigned FL320, which was indicated by the altimeter(s) while the transponder showed FL310.
On Aug 31st 2015 ATC detected the aircraft at FL350 instead of assigned FL360 indicated by the altimeter(s).
On Sep 5th 2015, flight Dakar to Ouagadougou, the autopilot acquired FL311 when flight level 330 was assigned and later acquired FL333 when flight level 330 was assigned.
Final BEA report is in French.
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