The inlet duct of an gas turbine engine is considered to be part of the airframe instead of the engine itself. Nevertheless, the engine inlet is usually identified as station one and is therefore called Engine Station Number One. · Air intakes form the first component of all air breathing propulsion systems. · The word Intake is normally used in the UK and Inlet in the United States. · Air intakes are usually manufactured by the airframe manufacturer in coordination with the engine manufacturer. · An aircraft may have one or more intakes depending upon the engine · Air intakes are required to capture freestream air, sometimes change its direction and then supply this to the engine. · This must be with as little flow distortion (non-uniformity) as possible. PURPOSE OF INLET DUCT · The purpose of the engine inlet duct is to provide the engine compressor with a uniform supply of air in order to prevent the compressor