14 CFR 25.853 (a), (c) and (d) dealing with Part 25 aircraft seat flammability requirements in layman terms. This AC also defines certain terms used in the FAR, in the context of these requirements. (2) For the ground and takeoff/climb phases of flight, the average flammability exposure must be calculated by dividing the time during the specific flight phase the fuel tank is flammable by the total time of the specific flight phase. (a) The applicant must provide data from analysis, ground testing, and flight testing, or any combination of these, that: (1) Validate the parameters used in the analysis required by paragraph M25.1 of this appendix; (2) Substantiate that the FRM is effective at limiting flammability exposure in all compartments of each tank for which the FRM is used to show compliance with paragraph M25.1 of this appendix; and. 14 CFR 25, Appendix F, Part I (vertical test) ASTM E662 Standard Test Method for Specific Optical Density of Smoke Generated 14 CFR 25 Vertical test – Classification of NFPA 130 FT≤ 10 sec; BL ≤ … ( NFPA130) A means must be provided to reduce the fuel tank flammability. This policy statement provides guidance on acceptable methods of compliance with the flammability requirements of Title 14, Code of Federal Regulations (14 CFR) part 25 for commonly constructed parts, construction details, and materials. It is most commonly used to show compliance with 14 CFR 25.853(a). 14 CFR Appendix F to Part 25 - Appendix F to Part 25 . (1) The person complies with 14 CFR 26.35 by the applicable date stated in that section. Improved Flammability Standards for Materials Used in the Interiors of Federal Aviation Administration Dates: March 6, 1995. The FAA requires this test for all passenger seating on privately owned or corporate chartered aircraft. '; Toggle navigation eCFR. 14 CFR 25 Vertical test- Brief. 2. N25.1 General. Appendix N to Part 25 - Fuel Tank Flammability Exposure and Reliability Analysis. RELATED FAR SECTIONS. Title 14, Code of Federal Regulations; Part # Title; Part 21: Certification Procedures for Products and Parts: Section 21.17: Designation of applicable regulations: Part 21, subpart H: Airworthiness Certificates: Part 23: Airworthiness Standards: Normal Category Airplanes: Part 25: Airworthiness Standards: Transport Category Airplanes: Part 27 A means must be provided to reduce the fuel tank flammability. (b) The applicant must validate that the FRM meets the requirements of paragraph M25.1 of this appendix with any airplane or engine configuration affecting the performance of the FRM for which approval is sought. (d) Except as provided in paragraph (e) of this section, the following interior components of airplanes with passenger capacities of 20 or more must also meet the test requirements of parts IV and V of appendix F of this part, or other approved equivalent method, in addition to the flammability requirements prescribed in paragraph (a) of this section: For purposes of this subpart - (a) Fleet Average Flammability Exposure has the meaning defined in Appendix N of part 25 of this chapter. To show compliance with Title 14 CFR FAR 25.853(c), Appendix F, Part II. In addition, we have included guidance for 14 CFR 25.856 and 14 CFR 23.856 testing for thermal/acoustic insulation. (i) Fuel tanks that are designed to be Normally Emptied must meet the flammability exposure criteria of Appendix M of part 25 of this chapter if any portion of the tank is located within the fuselage contour. 25.853 Compartment interiors. M25.3 Reliability indications and maintenance access. 14 CFR 25 Vertical test – Classification of NFPA 130. (a) Reliability indications must be provided to identify failures of the FRM that would otherwise be latent and whose identification is necessary to ensure the fuel tank with an FRM meets the fleet average flammability exposure requirements listed in paragraph M25.1 of this appendix, including when the FRM is inoperative. (c) The access doors and panels to the fuel tanks with FRMs (including any tanks that communicate with a tank via a vent system), and to any other confined spaces or enclosed areas that could contain hazardous atmosphere under normal conditions or failure conditions, must be permanently stenciled, marked, or placarded to warn maintenance personnel of the possible presence of a potentially hazardous atmosphere. 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