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MH370 - Definition of Insert document title Underwater Search Areas 3 December 2015 Location | Date ATSBATSB Transport Safety Report Transport Safety Report InvestigationInvestigation [Insert Mode] Occurrence InvestigationExternal Aviation Investigation XX-YYYY-####AE-2014-054 3 December 2015Final Executive summary This report provides an update to the MH370 search area definition, described in previous ATSB reports. For background information, please see the following ATSB publications available online at .au - Definition of underwater search areas, 18 August 2014 and Flight Path Analysis Update, 8 October 2014. Analysis of available data has been ongoing since the search for MH370 commenced. Initial results assisted the search and rescue mission, and later refinements have formed the basis for the underwater search areas. 1 The Australian Defence Science and Technology (DST) Group conducted a comprehensive analysis of the available data. The analysis used models of the Inmarsat satellite communications (SATCOM) data and a model of aircraft dynamics. Recorded meteorological data (wind and air temperature) were also modelled in the analysis. The SATCOM model was calibrated using SATCOM data and flight data from B777 flights including previous flights of the accident aircraft. Validation experiments were conducted to ensure that predictions aligned with actual flight data. The output of the DST Group analysis was a probability density function (PDF) defining the th probable location of the aircraft’s crossing of the 6 arc. These results were then extrapola