What’s Next For Auxiliary Power Units?

gearbox of Pratt & Whitney APS5000
The gearbox of the Pratt & Whitney APS5000, unlike traditional APUs, does not have a pneumatic supply due to the bleedless design of the Boeing 787.
Credit: Patrick Delapierre/AFI KLM E&M
The traditional role of the auxiliary power unit (APU) has been to provide electrical power and pneumatic supply for air conditioning and main-engine starting when aircraft are on the tarmac. That generally remains the case, although the Boeing 787 uses an APU that provides only an electrical supply...

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