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Recent Reports
Author:
Timothy R. Marker
Abstract:

The FAA has published two previous versions of the Aircraft Materials Fire Test Handbook: DOT/FAA/CT-89/15 and DOT/FAA/AR-00/12. The main purpose of the Handbook is to describe various fire test methods for aircraft materials in a consistent and detailed format. The Handbook provides information to enable the user to assemble and properly use certain test methods. The FAA adopted policy that made the first two versions of the Handbook an acceptable method of compliance for certain requirements in 14 Code of Federal Regulations (CFR) Part 25. This third-generation Handbook supports an FAA effort to revise the flammability requirements for Transport Category Airplanes in 14 CFR Part 25.

This Handbook organizes the test methods according to the threat posed by the material and its function. It describes various types of flammability tests in a consistent and detailed manner, and provides information to help the user assemble, operate, and use the test methods. Appendices contain additional information to broaden the utility of the Handbook.

Report:
Pages:
573
Size:
21 MB
Author:
Richard E. Lyon, Sanjeev Gandhi, and Sean Crowley
Abstract:

The fire behavior of heat-resistant polymers was measured to set a benchmark for the properties of polymers used in aircraft interiors and compare them with specialty and developmental polymers. Fire (cone) calorimeter tests were conducted on polyetherimide, polyamideimide, polyethylenenaphthalate, polysulfone, bisphenol-A polycarbonate, polyphenylenesulfide, polyetheretherketone, polyetherketoneketone, polyimide, polyphenylsulfone, and the polycarbonate of 1,1-dichloro-2,2-bis(4-hydroxyphenyl) ethylene (bisphenol-C). Fire calorimetry data were collected for the time to ignition, mass loss rate, heat release rate (HRR), and yields of flaming combustion products. Fire parameters derived from these data include critical radiant heat flux for piloted ignition, thermal inertia, heat of gasification, and ignition temperature. These thermoplastic polymers generated significant amounts of char when burned and exhibited relatively low HRRs as a consequence of the low volatile fuel fraction. The critical heat flux for ignition (fire resistance) of these thermoplastic polymers is a condensed phase criterion for ignition that increases with thermal stability because radiation and convection losses at the heated surface increase with polymer thermal decomposition temperature. However, the mass and energy flux at ignition are independent of thermal stability because these are gas phase criteria for the onset of flaming combustion. When ignited, the HRR of these heat-resistant polymers increases with the fuel value of the pyrolysis gases and the mass fraction of char, which protects the underlying polymer by reradiating incident energy and insulating the surface.

Report:
Pages:
33
Size:
1 MB
Author:
Haiqing Guo, Ezgi S. Oztekin, Sean Crowley, Paul Scrofani, Richard E. Lyon
Abstract:

Hidden fire in the aircraft cabin has been characterized as a hazardous phenomenon to in-flight safety and could lead to catastrophic disaster. Detecting hidden fire at the earliest stage is required and can be achieved only through an improved understanding of the transport of hot gases and smoke due to a possible hidden fire. This research uses the computation fluid dynamics tool to simulate the heat and mass transport in situations of hidden fire in the overhead area of the aircraft cabin. The modeled temperatures are compared with the full-scale test results, and reasonable agreements are observed. The simulation also presents comprehensive hot gas transport information. Further investigations are performed to examine the effect of ambient pressure and the fire source location. It is found that at cruise altitude with reduced ambient pressure, ceiling temperature increases as a result of increased flame height and decreased air entrainment. The ceiling temperature is sensitive to the fire source location. Hot gases tend to migrate to the highest ceiling location. Obstruction thicker than the ceiling jet boundary layer at the ceiling level can result in extra hot spots.

Report:
Pages:
35
Size:
2.23 MB