BAe / Avro RJ soundpacks ALF 502 / LF507

The BAe146 series was powered by the Avco Lycoming ALF 502 series engine, a twin spool high bypass ratio turbofan. Based around the core T55 turboshaft engine, the ALF 502 is composed of a fan and two axial flow low pressure compressor stages, driven by a 2 stage axial uncooled turbine and an inner high pressure compressor of 7 axial stages and one centrifugal stage driven by a 2 stage air cooled axial flow turbine.  The combustion chamber is of annular, reverse-flow type. Avco Lycoming was later acquired by Textron Lycoming and the FADEC (Full Authority Digital Engine Control) equipped LF507 development was used on the Avro RJ series aircraft.