LIGHT OFF: Sikorsky’s CH-53K Heavy-Lift helicopter has conducted the first test of its Auxiliary Power Unit (APU) engine, signaling the program is ready to begin formal integration testing early next year. The APU provides power to a 45-kilovolt-ampere generator, a 58-horsepower hydraulic pump and hydraulic starter. The engine is now being prepared for safety-of-flight testing and accomplishing on-time delivery of hardware for the ground test article, the company says.


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