Preliminary data based on the notification from the Brazilian authorities:
The aircraft took off from Guararapes airport (SBRF), Recife, pe, to Zumbi dos Palmares airport (SBMO), Maceió, al, to perform a flight of passenger transportation. during the descend, the crew report noise and "sparks" in the "rack" behind copiloto with smoke.
The crew reported "mayday" emergency and the appropriate checklist made. The landing at SBMO was normally.