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OBIGGS Utilization In Inaccessible Areas On A Wide Body Aircraft

In this project conducted by Federal Aviation Administration, the study focuses on designing and testing the OBIGGS system for fire protection in a 747SP overhead area. The study examines various conditions affecting OBIGGS efficiency, such as bleed air pressure and ventilation. The test article is a 747SP previously used in fuel tank inerting research with OBIGGS installed in the pack bay. The current test configuration includes NEA distribution to the overhead area with oxygen monitoring at 12 locations. The study aims to develop an effective distribution system based on preliminary testing data.

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OBIGGS Utilization In Inaccessible Areas On A Wide Body Aircraft

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  1. Federal Aviation Administration OBIGGS Utilization In Inaccessible Areas On A Wide Body Aircraft International Aircraft Systems Fire Protection Working GroupAtlantic City, NJ November 1, 2005 Steve Summer Project Engineer Federal Aviation AdministrationFire Safety Branch

  2. OBJECTIVES • Design and install an NEA distribution system for fire protection of the overhead area of the 747SP test article • Examine the effect of various conditions on the ability of the OBIGGS to successfully protect the overhead area: • Bleed air pressure • OBIGGS feed pressure • OBIGGS back pressure • Permeate pressure (altitude) • Ventilation • Etc.

  3. TEST ARTICLE • 747SP previously utilized in fuel tank inerting research efforts • OBIGGS installed in the empty pack bay utilizing 6 ASMs • Current instrumentation allows for monitoring oxygen at 12 locations • NEA flow and purity also measured as well as various system pressures

  4. TEST CONFIGURATION Current Test Section (STA 1241) From OBIGGS From OBIGGS Vacuum Source

  5. CURRENT TEST SECTION • Located at approximately STA 1241 • Approximately 20 ft. wide, 5 ft. tall at center • Cross-sectional area of approximately 42 ft2

  6. CURRENT STATUS • NEA line from OBIGGS is plumbed to overhead area • 8 oxygen sample lines located in overhead area (ability to add 4 more) • Ready to begin preliminary testing with one NEA deposit location to examine NEA spread rates • Next step is to use that data to develop distribution system

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