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This limit ensures that, in the case of hydraulic fluid leakage, any hydraulic fluid, that may come into contact with the brake units, will not be ignited in the wheelwell.
This limit does not ensure that, in the case of a high energy rejected takeoff, the maximum brake energy limitation will be respected.
Thermal oxidation increases at high temperatures. Therefore, if the brakes absorb too much heat, carbon oxidation will increase. This is the reason why the brakes should not be used repeatedly at temperatures above 500 °C during normal operation. In addition, after heavy braking, the use of brake fans �� can increase oxidation of the brake surface hot spots, if the brakes are not thermally equalized.
BRAKING ANOMALIES
Applicable to: ALL
If the ACCU PRESS drops below 1 500 PSI, the flight crew should be aware that the Parking Brake can, quite suddenly, become less efficient. This explains the amber range on the hydraulic pressure gauge of the ACCU PRESS.
If the flight crew encounters any braking problems during taxi, they should set the A/SKID & N/W STRG Sw to OFF. They should not apply pressure to the pedals while setting the A/SKID & N/W STRG Sw to OFF. Then, the PF should refer to the triple brake indicator and modulate the pressure as necessary.
BRAKE FANS ��
Applicable to: ALL
Brake fans cool the brakes, and the brake temperature sensor. Therefore, when the brake fans are running, the indicated brake temperature will be significantly lower than the indicated brake temperature when the brake fans are off.
 
NORMAL OPERATIONS
TAXI
 
Therefore, as soon as the brake fans are switched on, the indicated brake temperature decreases almost instantaneously. On the other hand, when the brake fans are switched off, it will take several minutes for the indicated brake temperature to increase and match the real brake temperature. When the fans are running, the difference between the indicated and the actual brake temperature
can range from 50 °C (when the actual brake temperature is 100 °C) to 150 °C (when the actual brake temperature is 300 °C). Therefore, before takeoff, if the fans are running, the flight crew should refer to the indicated brake temperature. When the indicated brake temperature is above 150 °C, takeoff must be delayed.
Brake fans should not be used during takeoff, in order to avoid Foreign Object Damage to fans and brakes.
FLIGHT CONTROL CHECK
Applicable to: ALL
At a convenient stage, before or during taxi, and before arming the autobrake, the PF silently applies full longitudinal and lateral sidestick deflection. On the F/CTL page, the PNF checks and calls out full travel of elevators and ailerons, and correct deflection and retraction of spoilers.
As each full travel/neutral position is reached, the PNF calls out:
? "Full up, full down, neutral"
? "Full left, full right, neutral"
　
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