14 CFR 25.856
§ 25.856 Thermal/Acoustic insulation materials.
United States · 14 CFR — Aeronautics and Space · Status: effective
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- Citation
- 14 CFR 25.856, § 25.856 Thermal/Acoustic insulation materials, United States, version 1 as recorded 2026-07-09, yourstate.us, https://yourstate.us/provision/54155
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Full text
(a) Thermal/acoustic insulation material installed in the fuselage must meet the flame propagation test requirements of part VI of Appendix F to this part, or other approved equivalent test requirements. This requirement does not apply to “small parts,” as defined in part I of Appendix F of this part.
(b) For airplanes with a passenger capacity of 20 or greater, thermal/acoustic insulation materials (including the means of fastening the materials to the fuselage) installed in the lower half of the airplane fuselage must meet the flame penetration resistance test requirements of part VII of Appendix F to this part, or other approved equivalent test requirements. This requirement does not apply to thermal/acoustic insulation installations that the FAA finds would not contribute to fire penetration resistance.
Legislative history
This is a federal regulation, adopted through agency rulemaking under the Administrative Procedure Act — not enacted by a recorded vote of Congress.