From: "Brad Gillies" <email@example.com> Organization: Internex Online (io.org), Toronto, Ontario, Canada Date: 01 Jun 96 16:27:13 References: 1 2
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>The description for the L-1011 also shows that the hydraulic systems are >generally "re-configurable" to a certain extent. For example, if one engine >shuts down, the hydraulic system it powers can be powered by another engine >via a transfer pump. Some aircraft provide an electrical pump as a backup, >and usually the APU can provide hydraulic power, or even a ram-air driven >turbine can power a system in the event that none of the engines nor the >APU are functioning and the plane is gliding. I Have yet to see any commercial transport aircraft from the DC-9 up to the 747 that has a Hydraulic pump on the APU. The APU only supplies Electrical power and Pneumatics. The hydraulic power would come from an electric pump somewhere else on the aircraft.