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Introduction to the ICAO Engine Emissions Databank

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The ICAO Engine Emissions Databank is an international reference database tracking exhaust emissions—including smoke, hydrocarbons, carbon monoxide, and nitrogen oxides—from commercial turbojet and turbofan aircraft engines. It compiles certified emissions data measured during a standardized Landing/Take-Off (LTO) cycle below 3,000 feet, making it relevant for assessing local air quality impacts at airports like Sea-Tac. The databank is regularly updated to reflect new engine certifications and design changes, though its fuel-flow figures are not intended for comparing overall engine fuel efficiency.

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ICAO Engine Emissions Databank introduction document covering standards for smoke, unburnt hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx) emissions from turbojet and turbofan aircraft engines under Annex 16 Volume II. Explains LTO (Landing/Take-Off) cycle methodology, Dp/Foo values, emissions index (EI), smoke number (SN), pressure ratio, rated output (Foo), regulatory levels, and data status categories (pre-regulation, certification, revised). Covers applicability dates including 1 January 1983 for smoke and 1 January 1986 for HC and CO, and the 26.7 kN rated output threshold for gaseous emissions standards.

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