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Technology Stocks : Cisco Systems, Inc. - Off-topic postings

CSCO 73.11

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Oct 31 9:30 AM EST

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To: Lynn who wrote (151)	5/2/2008 5:46:43 PM
From: Eric	Read Replies (1) of 230

All new large aircraft (and even small Cessna's) undergo "load" testing to verify structural integrity under simulated "G" loading. This is only one of many tests that the new aircraft design must pass in the process to get it's "Airworthiness Certificate" from the FAA. The most spectacular test involves bolting the airframe (fuselage) to the ground and numerous load cells are attached to the wings in hundreds of places and the wings are deflected upwards to simulate high positive load factors. Loads are increased, the wings bend upwards and then BANG! The wing spar breaks but the key is to have it break beyond the FAA standards. This is probably the most expensive test that the engineers sweat the most on. So the only way to do that is with an actual aircraft, just off the assembly line to verify the design and build process. Normally two aircraft just off the line are used for the static destructive tests. Up to 6 additional aircraft off the line will be used in actual flight testing. Boeing used to have videos of these tests on their website but they are not there at the present. I've seen films of 737, 747, 757, 767 and 777 structural failure tests over the years and they are spectacular. Normally our local TV stations in Seattle will air this stuff after Boeing releases the results to the FAA. I will post it when it becomes available. My guess is those tests should occur sometime late summer. Since this is the first true "plastic" commercial aircraft ever certified everyone in the industry will be watching.

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