OBIGGS Sizing Data for Transport Canada Trade Study

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OBIGGS Sizing Data for Transport Canada Trade Study William Cavage AAR-440 Fire Safety Branch

OBIGGS Sizing Data for Transport Canada Trade Study William Cavage AAR-440 Fire Safety Branch Wm. J. Hughes Technical Center Federal Aviation Administration International Systems Fire Protection Working Group Place de Ville Tower C Ottawa, Canada February 14 -15, 2005

Canada TSB Trade Study Inerting Data __________________ Outline • • • Background Methods Baseline

Canada TSB Trade Study Inerting Data __________________ Outline • • • Background Methods Baseline Data Results Summary AAR-440 Fire Safety R&D

Canada TSB Trade Study Inerting Data __________________ Objective of Work • Develop data on

Canada TSB Trade Study Inerting Data __________________ Objective of Work • Develop data on OBIGGS system performance to be used for a fire fighting trade study – Must quantify the size of system needed in terms of the number of ASMs for several different size aircraft o Must quantify fuel tank size and descent time at a minimum – Base calculations on flight test data • Use OBIGGS size data to develop fire fighting capability of the system AAR-440 Fire Safety R&D

Canada TSB Trade Study Inerting Data __________________ Develop System Sizing Data • Create 3

Canada TSB Trade Study Inerting Data __________________ Develop System Sizing Data • Create 3 aircraft CWT sizes based on familiar aircraft – Small (A 320), Medium (747 SP), and Large (747 -400) • Develop a spec missions (2) based on modified A 320 flight test profiles • Do analysis to size systems – Base system performance on measured flight test data • Use purity and flow measured on single ASM A 320 flight test • Assume each CWT is a single bay box with a single deposit and vent – Make calculations of resulting ullage oxygen concentration using developed FAA ullage inerting model • Determine number of ASMs needed to land below 12% for 2 different system methodologies (dual flow & single high flow) AAR-440 Fire Safety R&D

Canada TSB Trade Study Inerting Data __________________ Specified Low Descent Rate Mission AAR-440 Fire

Canada TSB Trade Study Inerting Data __________________ Specified Low Descent Rate Mission AAR-440 Fire Safety R&D

Canada TSB Trade Study Inerting Data __________________ Example of Ullage Model Results of System

Canada TSB Trade Study Inerting Data __________________ Example of Ullage Model Results of System Sizing AAR-440 Fire Safety R&D

Canada TSB Trade Study Inerting Data __________________ Example of Ullage Model Results of System

Canada TSB Trade Study Inerting Data __________________ Example of Ullage Model Results of System Sizing AAR-440 Fire Safety R&D

Canada TSB Trade Study Inerting Data __________________ Results of Analysis – Low Descent Rate

Canada TSB Trade Study Inerting Data __________________ Results of Analysis – Low Descent Rate AAR-440 Fire Safety R&D

Canada TSB Trade Study Inerting Data __________________ Results of Analysis – High Descent Rate

Canada TSB Trade Study Inerting Data __________________ Results of Analysis – High Descent Rate AAR-440 Fire Safety R&D

Canada TSB Trade Study Inerting Data __________________ Summary • FAA used developed tools to

Canada TSB Trade Study Inerting Data __________________ Summary • FAA used developed tools to size systems for generic aircraft for trade study of OBIGGS fire fighting capability • Developed a range of flows and maximum flows predicted for use in aircraft fire fighting given three generic single bay fuel tanks – More work is needed to characterize specific volume flow and purities expected from each system give specific altitudes and bleed air pressures outside of observed flight test conditions • More work needed to quantify the effects of a compartmentalized tank on system sizing requirements AAR-440 Fire Safety R&D