Honeywell has released a high-efficiency mode upgrade for its 131-9A auxiliary power unit for single-aisle Airbus aircraft. This high-efficiency mode, which is enabled by a software encryption key, is expected to increase the average time-on-wing by 1,200 flight hours and reduce fuel burn by two percent, according to Honeywell. An auxiliary power unit (APU) provides electrical power and air conditioning while the plane is on the ground to ensure increased passenger comfort, and supplies the air source when a pilot is ready to start the main engines. Honeywell says their 131-9A is known for its reliability and lower maintenance costs over the course of its entire life cycle, resulting in significant fuel savings each year. “Now, more than ever, our airline customers are concerned with cost savings and operational efficiency. This upgrade is an easy, one-time modification enabled with software and will be available first for our Maintenance Service Plan customers, and later for all…