Date: 21 Nov 99 23:56:42 From: Jeff <firstname.lastname@example.org> Organization: @Home Network References: 1 2
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If you have a long taxi-out, then a great way to control brake temperature is with a slow taxi speed. A common practice at my aairline is "If delaying gear retraction to cool brakes, one minute of airborne cooling equates to approximately 10 minutes of ground cooling." In the Operation Manual of each airliner is a "Brake Cooling Procedure after Aborted Takeoff". It has a chart that you follow starting with your Gross Weight (take-off weight), then the indicated airspeed that you started the abort, the pressure altitude, and the outside air temperature. I'll give you an example for a 767-300ER: Your Gross Weight=320,000 and you abort the t/o at 120 knots. The Pressure altitude is 3,000ft. It's 80F outside. The brake cooling time would be 48 minutes before you can attempt another take-off. Usually, while your waiting, you do not set the parking brake. If the waiting time is more than 60 minutes, Maintenance (a mechanic) is required to check it out.