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OBIGGS Sizing Data for Transport Canada Trade Study

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 . Outline.

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OBIGGS Sizing Data for Transport Canada Trade Study

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  1. OBIGGS Sizing Data for Transport Canada Trade Study William CavageAAR-440 Fire Safety BranchWm. J. Hughes Technical CenterFederal Aviation Administration International Systems Fire Protection Working Group Place de Ville Tower C Ottawa, Canada February 14-15, 2005

  2. Outline • Background • Methods • Baseline Data • Results • Summary AAR-440 Fire Safety R&D

  3. 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 • 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

  4. Develop System Sizing Data • Create 3 aircraft CWT sizes based on familiar aircraft • Small (A320), Medium (747SP), and Large (747-400) • Develop a spec missions (2) based on modified A320 flight test profiles • Do analysis to size systems • Base system performance on measured flight test data • Use purity and flow measured on single ASM A320 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

  5. Specified Low Descent Rate Mission AAR-440 Fire Safety R&D

  6. Example of Ullage Model Results of System Sizing AAR-440 Fire Safety R&D

  7. Example of Ullage Model Results of System Sizing AAR-440 Fire Safety R&D

  8. Results of Analysis – Low Descent Rate AAR-440 Fire Safety R&D

  9. Results of Analysis – High Descent Rate AAR-440 Fire Safety R&D

  10. 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

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