While the air traffic control system saw significant improvement with the implementation of the Amazon Surveillance System (SIVAM) in the northern portion of the country, there were many warning signs that the system as a whole was heading towards an untenable situation. In 2003, the Brazilian Air Force warned of the need for upgraded equipment and additional funding. For three years, budget requests submitted by DECEA, the Air Force department in charge of air traffic control, were denied. The government's "Tribunal de Contas da União" (Union Accounting Tribunal), an agency similar to the US Government Accountability Office, issued a report after the crisis which echoed the FAB's concerns, stating that a lack of planning and underfunding of the air traffic control system by the federal government was to blame for the crisis.