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Four behemoth engines push the bird at up to 88 percent of
the speed of sound for unbelievable distances, up to 13,500 km, without refueling.
The length of the aircraft alone (45 m) is longer than the Wright brothers ??™ entire
first flight.
But these amazing statistics, after 30 years finally to be eclipsed by even larger
passenger aircraft, are nothing compared to the complexity of the system of systems
which makes up the Boeing 747-400. The aircraft ??™ s electrical systems comprise
some 274 km of wiring alone; high-strength aluminum and titanium parts
are designed to work both standing still and heated by rapidly passing air. Backup
systems keep navigation and life-sustaining systems running if primary systems
fail; and even the in-flight entertainment system is one of the more complex systems
on earth. In fact, the Boeing 747-400 comprises some 6 million parts, about
half of which are simply fasteners like screws and bolts. It ??™ s no wonder that a
Boeing spokesman once quipped, ??? We view a 777 as a collection of parts flying in
close proximity.


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