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Old 15th Apr 2009, 06:34
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Bruce Waddington
 
Join Date: Aug 2007
Location: Vancouver, Canada
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Dixi188

The statement you make about brake temperature is only party true. The Yahoo Airbus Discussion Group has some wonderful information on Carbon Brake wear and it is indeed directly tied to the number of applications and the temperature of the brake. At lower temperatures the wear per application is higher. As the temperature of the brake increases there will be a decrease in wear per application and then an increase in wear per application as the temperature rises even higher.

The graph for each brake manufacturer approved for the Airbus fleet varies somewhat (wear rates and temperatures), but the general pattern is similar for each one.

But, and this is a huge but, the brakes do not work better if they are hot. A brake can only absorb a limited amount of energy before it fails and the hotter a brake is to start with the less energy it can absorb during a rejected take-off before that failure takes place. Some of the mob I worked for taught this concept of 'hotter brakes work better' and it was always my opinion ... well we won't get into that ... enough to say that the concept is incorrect.

best regards,

Bruce Waddington
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