Thermal/Acoustic Insulation Installed on Transport Category Airplanes

This action modifies the requirements for improved flammability characteristics of thermal/acoustic insulation used as replacements on airplanes manufactured before September 2, 2005. The FAA has recently been provided information that the rule will apply to a much broader range of components in currently operating airplanes than was originally intended. In addition, since publishing a final rule on July 31, 2003, the FAA has learned that some requirements for improved flammability covered materials do not have a significant effect on airplane fire safety. Further, in many cases, compliant replacements are not readily available. This action focuses the requirements on replacement materials that have a greater effect on safety and are readily available, and is necessary to avoid grounding of airplanes.