An Avianca Brasil Airbus A318-100, registration PR-ONH performing flight O6-6378 from Sao Paulo Guarulhos,SP to Juazeiro Do Norte,CE (Brazil) with 99 passengers, was enroute at FL370 about 300nm east of Brasilia when the crew decided to divert to Brasilia reporting smoke in the cabin. The aircraft descended to FL180 for the diversion and landed safely on Brasilia’s runway 29L about one hour after initiating the diversion.
A replacement Airbus A319-100 registration PR-AVD reached Juazeiro Do Norte with a delay of 5 hours.
Brasilia’s Federal Police reported the aircraft reported smoke on board.
The airline reported the crew received an abnormal indication for the air conditioning system.
Full report here