131 Series Auxiliary Power Units
131 Series APUs
The 131 family of auxiliary power units (APUs) is one of the most successful of all time, with more than 100 million hours of in-service use.
The 131-9 auxiliary power unit (APU), previously designed for the Boeing MD-90 aircraft, gained an immediate following. With the introduction of the 131-9B it became standard equipment on the Boeing B737NG family of aircraft, as well as the with the introduction of the 131-9A as airline selectable on the Airbus A320 family. It was then also chosen for the Bombardier C-Series.
It’s easy to understand its popularity. The 131-9 introduced a two-stage axial turbine for longer engine life and a single starter/generator that uses electrical power to start the APU, and then becomes a generator once it’s running. This has led to the 131 Series becoming one of the most successful APUs with more than 100 million hours of in-service use.
131-9A/9B APU High Efficiency Mode – Upgrade Now
Honeywell has released a High Efficiency Mode (HEM) upgrade for its 131-9A/9B auxiliary power unit for single-aisle Airbus and Boeing aircraft HEM meets our customers’ need for more power on the aircraft greater fuel-efficiency and a smaller environmental footprint.