http://www.apla.org.ar/index.php?content=article&id=709
Taken from the above link:
IFALPA Safety Bulletin: No Area Radar Coverage in the Baires TMA (Buenos Aires, Argentina)
The area radar serving the Baires TMA in Argentina is out of action as a result of being struck by lighting.
Consequently, all air traffic control is being carried out procedurally until repairs can be affected.
In addition, Air Traffic Control Service provision is in the process of being passed from the Fuerza Aérea Argentina and the Armada de Argentina to the Civil Aviation Authority.
Advice from Asociacion de Pilotos de Lineas Aereas suggests that while the handover takes place there may be severe disruption to ATC service throughout Argentina. Therefore, pilots operating in Argentinean airspace should exercise extreme vigilance and awareness of the present ATC situation in order to maintain safe operations.