Fuel tanks

This regulation requires turbine-powered transport category airplanes operated under Part 121 after October 30, 1991, to meet specific fuel tank safety standards. Specifically, these aircraft must comply with § 25.963(e) as it was written on October 30, 1989.

Section 25.963(e) addresses fuel tank design requirements to prevent ignition sources and ensure proper ventilation. This includes provisions for preventing hazardous vapors, protecting against lightning strikes, and ensuring fuel system components don't create ignition risks.

In practical terms, this means Part 121 carriers cannot operate turbine aircraft unless they meet these fuel tank safety standards. The regulation "freezes" the requirement to the 1989 version of § 25.963(e), ensuring consistent safety standards regardless of later regulatory changes. This matters because fuel tank safety is critical for preventing catastrophic fires and explosions, making it a fundamental airworthiness requirement for airline operations.

*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.*