TSS BAe 146 ALF-502 MAX Edition Sound Package

The British Aerospace 146 (also BAe 146) is a short-haul airliner and a regional airliner that was manufactured in the United Kingdom by British Aerospace, later part of BAE Systems. Production ran from 1983 until 2002. Manufacture of an improved version known as the Avro RJ began in 1992. A further-improved version with new engines, the Avro RJX, was announced in 1997, but only two prototypes and one production aircraft were built before production ceased in 2001. With 387 aircraft produced, the Avro RJ/BAe 146 is the most successful British civil jet airliner programme

The BAe 146 is powered by four Avco Lycoming ALF 502 turbofan engines, which are fixed on pylons underneath the aircraft's high wing. The ALF 502 was derived from the Lycoming T55 turboshaft powerplant that powers the Chinook heavy transport helicopter. Notably, the ALF 502 had a very low level of operational noise, much lower than most other competing aircraft. This was achieved partly by the engine's high bypass ratio along with additional sound damping layers built into the engine.