B - Operations – Transporting – 64 – D
Patent
B - Operations, Transporting
64
D
B64D 33/08 (2006.01) B64D 33/10 (2006.01) B64D 41/00 (2006.01)
Patent
CA 2703115
A passive cooling system for an auxiliary power unit (APU) installation on an aircraft is provided. The APU is housed within a compartment of the aircraft that is defined at least in part by the aircraft skin. The APU includes a compressor portion and an oil cooler contained separately within the compartment. An engine exhaust opening is defined in the aft portion of the aircraft skin. A first air inlet duct communicates with a second opening defined in the aircraft skin and with the compressor portion. The oil cooler is located within a second duct communicating with an opening other than the engine exhaust opening and with the engine exhaust opening, whereby exterior cooling air and engine exhaust ejected through the engine exhaust opening entrain cooling air through the second duct to the oil cooler, thereby providing oil cooling.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Pratt & Whitney Canada Corp.
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