A318/A319/A320/A321 机组训练手册 FCTM Flight Crew Training Manual(115)

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ANTI-SKID
The anti-skid system adapts pilot applied brake pressure to runway conditions by sensing an impending skid condition and adjusting the brake pressure to each individual wheel as required. The anti-skid system maintains the skidding factor (slip ratio) close to the maximum friction force point. This will provide the optimum deceleration with respect to the pilot input. Full pedal braking with anti-skid provides a deceleration rate of 10 kt/sec.
BRAKES
The use of auto brake versus pedal braking should observe the following guidelines:
? The use of A/BRAKE is usually preferable because it minimizes the number of brake applications and thus reduces brake wear. Additionally, the A/BRAKE provides a symmetrical brake pressure application which ensures an equal braking effect on both main landing gear wheels on wet or evenly contaminated runway. More particularly, the A/BRAKE is recommended on short, wet, contaminated runway, in poor visibility conditions and in Auto land.
? The use of LO auto brake should be preferred on long and dry runways whereas the use of MED auto brake should be preferred for short or contaminated runways. The use of MAX auto brake is not recommended.
? On very short runways, the use of pedal braking is to be envisaged since the pilot may apply full pedal braking with no delay after touch down.
 

  NORMAL OPERATIONS
LANDING
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL 

? On very long runways, the use of pedal braking may be envisaged if the pilot anticipates that braking will not be needed. To reduce brake wear, the number of brake application should be limited.
? In case of pedal braking, do not ride the brakes but apply pedal braking when required and modulate the pressure without releasing. This minimizes brake wear.
The green DECEL light comes on when the actual deceleration is 80 % of the selected rate. For example the DECEL light might not appear when the autobrake is selected on a contaminated runway, because the deceleration rate is not reached with the autobrake properly functioning. Whereas the DECEL light might appear with LO selected on a dry runway while only the reversers achieve the selected deceleration rate without autobrake being actually activated. In other words, the DECEL light is not an indicator of the autobrake operation as such, but that the deceleration rate is reached.
Since the auto brake system senses deceleration and modulates brake pressure accordingly,
the timely application of MAX reverse thrust will reduce the actual operation of the brakes themselves, thus the brake wear and temperature.
Auto-brake does not relieve the pilot of the responsibility of achieving a safe stop within the available runway length.
CROSS WIND CONDITIONS
The reverse thrust side force and crosswind component can combine to cause the aircraft to drift to the downwind side of the runway if the aircraft is allowed to weathercock into wind after landing. Additionally, as the anti-skid system will be operating at maximum braking effectiveness, the main gear tire cornering forces available to counteract this drift will be reduced.
　
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