RECOMMENDED BRAKE COOLING SCHEDULE
Advisory information is provided to assist in avoiding the problems associated with hob brakes. For normal operation, most landings are at weights below the AFM Quick turnaround limit weight. Use of the recommended cooling schedule will help avoid brake overheat and fuse plug problem that could result from repeated landing at short time intervals or a rejected takeoff.
Enter the Recommended brake cooling schedule table with the airplane weight, the brake on speed adjusted for wind and the appropriate temperature altitude condition. Instructions for applying wind adjustments are included below the table. Linear interpolation may be used to obtain intermediate values. The resulting number is the reference brake energy per brake in millions of foot-pounds, and represents the amount of energy absorbed by each brake during a rejected takeoff.
To determine the energy per brake absorbed during landing, enter the appropriate adjusted brake energy per brake table (no Reverse thrust or 2 engine Reverse thrust) With the reference brake energy per brake and the type of braking used during landing (Max manual, Max Auto, or autobrake) the resulting number is the adjusted brake energy per brake and represents the energy absorbed in each brake during the landing.
The recommended cooling time is found in the final table by entering with the adjusted brake energy per brake or brake temperature monitor system (BTNS) Indication on EICAS. Times are provided for ground cooling and in flight gear down cooling. If brake temperature monitor indication on EICAS is available, the hottest brake indication 10 to 15 minutes after the airplane has come to a complete stop, or in flight with retracted, may be used to determine the recommended cooling schedule by entering at the bottom of the chart. The brake temperature light illuminates when the hottest brake is registering 5 on the EICAS indication and extinguishes as the hottest brake cools with an EICAS indication of 4.
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