The A350 is equipped with the most powerful auxiliary power unit (APU) ever built by Honeywell, producing 200 shp more than the 331-600, the previous top-of-the-line model, but with virtually no additional weight. A redesigned reduction gearbox accommodates the more-powerful 230-volt AC, 150-kVA starter generator. The latest digital electronic control unit (ECU) provides carefree handling, cold-soaked starts at up to 43,100 ft. at ISA-24C, health monitoring and exception logging. The ECU ...

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