We operated the original -1s and 50s, and the APU was so efficient that we ran an air conditioning pack at the same time as we started the engine (apparently to avoid a pressure surge when the starter motor cut off). Because of the design of the APU, it runs most efficiently in min mode with a pack on. Close the APU bleed valve and the APU surge valve opens and all the load compressor air is vented overboard and you can hear the APU struggling. |
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