ANN Daily Touch-And-Go: 04.24.08>
Your Podscope hit is at 1:13
Delta announces an almost unbelievable first-quarter loss.Boeing, however, is doing great.And DOT says airline fares ended last year on an upbeat note.
Thu, 24 Apr 2008 03:01:01 -0400
Design of Boeing 777 electric system
Aerospace and Electronic Systems Magazine, IEEE, Vol. 7, No. 7. (1992), pp. 4-11.The electric power system for the Boeing 777 is comprised of two independent electrical systems, the main and the backup. The main electric system includes two engine-driven integrated drive generators, a generator driven by the auxiliary power unit, three generator control units, and a bus power control unit. The backup electric system includes two engine-drive generators and one integrated converter/control unit to provide the redundancy of electrical sources equivalent to a three-engine airplane. Automation of the system is achieved by the use of state-of-the-art, microprocessor-based control units that perform system control, protection, and built-in-test functions. Each control unit has redundant two-way communication through an ARINC 629 communication bus that requires significantly fewer discrete wires than similar systems, allowing considerable reduction of the interface circuits and reduction in weight
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