---
kind: "section"
citation: "14 C.F.R. § 91.613"
title: "14"
number: "91.613"
heading: "Materials for compartment interiors."
url: "https://uscodex.org/cfr/14/91.613"
---

# §91.613. Materials for compartment interiors.

- (a) No person may operate an airplane that conforms to an amended or supplemental type certificate issued in accordance with SFAR No. 41 for a maximum certificated takeoff weight in excess of 12,500 pounds unless within 1 year after issuance of the initial airworthiness certificate under that SFAR the airplane meets the compartment interior requirements set forth in § [25.853 (a)](/cfr/14/25.853.md?p=a), [(b)](/cfr/14/25.853.md?p=b), [(b-1)](/cfr/14/25.853.md?p=b-1), [(b-2)](/cfr/14/25.853.md?p=b-2), and [(b-3)](/cfr/14/25.853.md?p=b-3) of this chapter in effect on September 26, 1978.
- (b) **Thermal/acoustic insulation materials.** For transport category airplanes type certificated after January 1, 1958:
  - (1) For airplanes manufactured before September 2, 2005, when thermal/acoustic insulation is installed in the fuselage as replacements after September 2, 2005, the insulation must meet the flame propagation requirements of [§ 25.856](/cfr/14/25.856.md) of this chapter, effective September 2, 2003, if it is:
    - (i) Of a blanket construction or
    - (ii) **Installed around air ducting.**
  - (2) For airplanes manufactured after September 2, 2005, thermal/acoustic insulation materials installed in the fuselage must meet the flame propagation requirements of [§ 25.856](/cfr/14/25.856.md) of this chapter, effective September 2, 2003.

## Notes

### Amendments

[Docket 18334, 54 FR 34318, Aug. 18, 1989, as amended by Amdt. 91-279, 68 FR 45083, July 31, 2003; Amdt. 91-290, 70 FR 77752, Dec. 30, 2005]

### Source

Source: Docket 18334, 54 FR 34318, Aug. 18, 1989, unless otherwise noted.

### Authority

Authority: 49 U.S.C. 106(f), 40101, 40103, 40105, 40113, 40120, 44101, 44111, 44701, 44704, 44709, 44711, 44712, 44715,44716, 44717, 44722, 44740, 46306, 46315, 46316, 46504, 46506-46507, 47122, 47508,47528-47531, 47534; Pub. L. 112-95, 126 Stat. 11; Pub. L. 114-190, 130 Stat. 615 (49 U.S.C. 44703 note); sec. 828, Pub. L. 118-63, 138 Stat. 1330 (49 U.S.C. 44703 note); articles 12 and 29 of the Convention on International Civil Aviation, 61 Stat. 1180.

### Amendments

[Docket 18334, 54 FR 34318, Aug. 18, 1989, as amended by Amdt. 91-279, 68 FR 45083, July 31, 2003; Amdt. 91-290, 70 FR 77752, Dec. 30, 2005]