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A
In the RTO mode the auto-brake system provides a fixed level of deceleration.
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B
Manual braking is always the best stopping technique for a rejected take-off.
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C
When the RTO mode is armed, the system will operate at any speed when the take-off is aborted.
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D
Without pilot interference an auto-brake system continues to operate until standstill.
- “In the RTO mode the auto-brake system provides a fixed level of deceleration.” INCORRECT. If certain conditions are met, the RTO autobrake setting commands maximum braking pressure/power. Therefore, it does not provide a predetermined fixed braking force.
- “Manual braking is always the best stopping technique for a rejected take-off.” INCORRECT. Especially when conditions are less than ideal (shorter and wet runways), or rejected take off, many flight crews prefer to use the autobrake rather than use manual braking, and devote their attention to the use of rudder for directional control => “the machine does the braking and I maintain directional control”. Autobrake reduces pilots’ workload and allows them to channel their attention to other important duties. Furthermore, with autobrake, the human’s reaction time on pressing the brakes is eliminated – therefore, it is more efficient.
- “When the RTO mode is armed, the system will operate at any speed when the take-off is aborted.” INCORRECT. The wheel speed must be at least (around) 90 kts and the thrust levers must be moved to idle position. In case of an aborted take off below wheel speed of 90 kts, the autobrake system will not activate.
- “Without pilot interference an auto-brake system continues to operate until standstill.” CORRECT. Unless the system is disarmed by flight crew pressing the pushbutton switch or applying enough deflection to at least one brake pedal – the autobrake will bring the aircraft to a complete stop.
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