Honeywell has rolled its 100,000th auxiliary power unit (APU) off the production line that also happens to be its 15,000th 131-9 model, its most popular APU flying today, the Phoenix-based provider of aircraft systems and engines announced today. “Our legacy and leadership in this space combined with our expertise in connectivity make us well equipped to provide aircraft operators with the next generation of APUs and dependable backup power for years to come,” said Honeywell Aerospace engines and power systems president Brian Sill.

In 1950, Honeywell’s first APU took to the skies. Currently, more than 36,000 of them are in service on aircraft ranging from business, commercial, regional and military fixed-wing airplanes and rotorcraft. Of those, more than 13,000 are the model 131-9 and are primarily found on Boeing 737 and Airbus A320 airliners. Honeywell introduced the model 131-9 in 1995.

Additionally, Honeywell said it will soon introduce a new unit to provide on-ground power to turboprops and small to midsize jets.