Tim Marker FAA Technical Center Development of a Lab-Scale Test For Evaluating Toxic Gas Decomposition Products Generated Inside a Fuselage During a Postcrash.

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Presentation transcript:

Tim Marker FAA Technical Center Development of a Lab-Scale Test For Evaluating Toxic Gas Decomposition Products Generated Inside a Fuselage During a Postcrash Fire

Fuselage Burnthrough Full-Scale Testing - Background Full-sale test article built at FAATC in mid 1990’s for evaluating performance of burnthrough-resistant thermal acoustic insulation materials. Testing indicated burnthrough-resistant insulation provided a much more survivable cabin atmosphere when compared to current insulation materials. Although burnthrough resistant materials provide a benefit, the ingress of toxic gases resulting from decomposition of the insulation needs to be quantified. FAA issued NPRM, 2003 Final Rule issued, 2009 compliance 2006 FAATC began development of a lab-scale test for evaluating toxic gas decomposition products that could be generated inside fuselage during postcrash fire.

Apparatus for Evaluating Toxic Gas Decomposition Products

Fourier Transform Infrared (FTIR)/Total Hydrocarbon Gas analysis system used to collect and measure toxic and flammable gases yielded during tests. Burner configuration according to (b) Appendix F, Part VII. Steel cube box simulates intact fuselage and serves as enclosure to collect emitted gases. Additional analyzers measured the concentration of total hydrocarbons (THC) as propane, carbon monoxide, carbon dioxide, and oxygen Apparatus for Evaluating Toxic Gas Decomposition Products

sampling ports for gas analysis Apparatus for Evaluating Toxic Gas Decomposition Products

catch pan for melted aluminum skin Apparatus for Evaluating Toxic Gas Decomposition Products

pressure relief device Apparatus for Evaluating Toxic Gas Decomposition Products

Gasket System Used for Securing Test Sample in Enclosure

It is anticipated that this test method could be used to evaluate the potential toxicity of insulation constructions and innovations meeting the new burnthrough test requirements, in order to ensure that an adverse condition will not result inside the fuselage, despite the high burnthrough performance associated with a particular system. Development of Lab-Scale Toxicity Test For Decomposition Products During a Postcrash Fire This test method could also be used to evaluate the toxic contribution of the basic fuselage structure, whenever a nonmetallic material is used as the primary component.

Several preliminary lab-scale tests completed using various burnthrough resistant materials. Development of Lab-Scale Toxicity Test For Decomposition Products During a Postcrash Fire Additional full-scale tests required to determine the correlation between full- and lab-scale tests. Full-scale tests to focus on the amount of toxic gas decomposition products entering cabin area from the non-exposed skin side.

Full-Scale Test Article for Evaluating Non-Metallic Fuselage