Air Senegal is famous for being a well below standard operator. Its aoc had been suspended. But they got i back at the time of the accident.
The old Hawker had been short of airworthiness certificate for a while too.But got it back, even though it was full of snags.
Captain was neither experienced nor famous to be proficient.
In Flight Broadcast Procedure on 126,9 and Strategic Lateral Offset Procedure are more than a suggestion. They are implelented as written on the charts.
On a hs125-700, if you take off from Ouaga to Dakar, with the prevailing west winds (108 kt few days ago on the same route), it can be more than 3,5 hours.
If you do not transfert the ventral and dorsal tank in the wings (because you are knocked out ?), the aircraft could very well fuel starve shortly after passing DKR.
My Two cents