Materials for compartment interiors

This regulation sets fire safety standards for cabin interior materials in Part 135 aircraft. It primarily affects operators of large airplanes (over 12,500 pounds), requiring materials like seat covers, sidewalls, and ceiling panels to meet specific flammability and smoke emission standards from FAR Part 25.

The specific requirements depend on when the airplane was type certificated and manufactured, with stricter standards applying to newer aircraft. Key provisions include:

• Airplanes with 20+ passenger seats manufactured after 1988 must meet heat release rate testing standards
• Seat cushions (except flight crew seats) must meet fire protection requirements
• When cabin interiors are substantially replaced, they must meet the flammability standards that were current when replaced
• Thermal/acoustic insulation installed after September 2, 2005 must meet flame propagation requirements

Older galley carts manufactured before March 1995 may continue to be used even if they don't meet current standards. The regulation ensures that as aircraft interiors are refurbished, they incorporate improved fire safety materials.

*This is a plain-English summary for study only. The official 14 CFR text on this page is controlling — always read the current regulation and consult a CFI.*