PPRuNe Forums - View Single Post - VH-PGW PA-31P-350 15 June 2010 Crash Investigation
Old 17th Jul 2010, 00:31
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Old Akro
 
Join Date: Feb 2006
Location: Melbourne
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Did Marconi ever meet Bernoulli?

Guglielmo Marconi was born about 200 years after Daniel Bernoulli, so I'm confident they never conspired. There are no radio calls that would have changed the way this aeroplane flew. There are no radio calls that would have changed its fate. The aeroplane did what physics and a pilot told it to do. Aviate, Navigate, Communicate.

Similarly, pieces of metal do not get together to have parties to celebrate birthdays. As far as I can see the whole aging aircraft thing has been invented to pursue some sort of political agenda. Are we concerned about the age of our bridges? Buildings? Trains. Ships? Dams? Gas pipes? The list goes on.

Aircraft deterioration with age is primarily about 2 things. 1. Fatigue life. While our GA fleet might be old, the vast majority of the fleet is well under its fatigue cycle design limits. 2. Maintenance and the number of times & diligence with which parts have been disassembled & reassembled for inspection. Diligent maintenance (which is sadly uncommon) means that a 5,000 hour aircraft is as safe and reliable as a new one. In fact the "bathtub"curve of component failures would suggest that it would be more safe.

A car over its life might have as little as 10 labour hours spent on its maintenance (ie 30,000km service interval x 5). Unlike aeroplanes which have a maintenance and part replacement schedule, cars are not maintained. A typical light aircraft might have twice as many labour hours spent on its maintenance in a year as a car does in its life. To use cars as a paradigm for aircraft aging is false & misleading. No intelligent person would do this unless they were pursing a false agenda. Its certainly has no engineering discipline as its base.
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