Feb 28 (Reuters) - Austal Ltd ASB.AX :
* REAFFIRMS FY2019 GROUP REVENUE GUIDANE OF ABOUT $1.9 BILLION
* FY2019 U.S. SHIPBUILDING MARGIN IS PROJECTED TO BE IN RANGE OF 7-8 PERCENT
* AUSTAL SAYS IN RELATION TO DATA BREACH, NO EVIDENCE TO SUGGEST THAT INFO AFFECTING NATIONAL SECURITY, COMMERCIAL OPERATIONS OF CO HAVE BEEN STOLEN