Slide #4 International Aircraft Systems Fire Protection Working Group 20-21Jun04Grenoble, France Federal Aviation Administration ~ WJ Hughes Technical Center Fire Safety Branch, AAR-440 ~ Atlantic City Int'l Airport, NJ 08405 USA EQUIVALENCE METHODOLOGY - OVERVIEW  TESTING OCCURS IN A FIXTURE CONTAINING SALIENT FEATURES OF THE ENGINE NACELLE ENVIRONMENT  THE EQUIVALENCE METHODOLOGY IS TWO-PART  ESTABLISH A MASS EQUIVALENCE BETWEEN AGENTS BASED ON FIRE EXTINCTION PERFORMANCE  A H1301 BENCHMARK IS ESTABLISHED  THE REPLACEMENT CANDIDATE QUANTITY IS CHANGED UNTIL THE H1301 BENCHMARK IS MET OR EXCEEDED  ESTABLISH A CONCENTRATION EQUIVALENCE BASED ON AGENT DISTRIBUTION BEHAVIOR OF THE MASS EQUIVALENT  GAS ANALYSIS IS USED TO CAPTURE PERFORMANCE  TIES BACK TO FIRE EXTINCTION PERFORMANCE  PROCESS IS REPEATED IN 4 EQUIVALENCE ITERATIONS TO FIND THE LARGEST EQUIVALENT CONCENTRATION (2 ventilation conditions x 2 fire threats)
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