Federal Aviation Administration computer systems remain vulnerable to cyber attacks despite improvements at a number of key radar facilities in the past year, according to a new government review.The Department of Transportation's Inspector General said while the FAA has taken steps to install more sophisticated systems to detect cyber intrusions in some air traffic control facilities, most sites have not been upgraded. And there is no timetable yet to complete the project, the IG said.FAA spokeswoman Laura Brown said the agency is working on a timetable and will notify the IG with that information soon. The FAA also said that upgrades to critical air traffic control systems have taken precedence over the intrusion detection improvements at a number of facilities.

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