This AC addresses temperature probes, combined temperature and pressure probes, and static pressure probes installed in turbine engines.

This advisory circular (AC) describes an acceptable method to demonstrate compliance with Title 14, Code of Federal Regulations (14 CFR) §§ 23.2620(a)(1), 25.1583(b)(1), 27.1583(b)(1), 29.1583(b)(1), 33.7(b)(2), and 33.7(c)(2) regarding the requirements for the approval and use of Fuel System Icing Inhibitors (FSII) in engines and aircraft.

This advisory circular (AC) provides definitions, guidance, and acceptable methods, but not the only methods, to demonstrate compliance with the engine fire protection requirements of title 14 Code of Federal Regulations (14 CFR 33.17).

Section 33.70 contains requirements applicable to the design and life management of engine life-limited parts, including high-energy nickel powder rotating parts.

This AC addresses turbine aircraft engine compliance methods, failure modes,
§33.67 lessons learned, and references to associated aircraft-level guidance. It does not
address aircraft-level fuel system icing effects or compliance.