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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.
Braking force and cornering force vs skid ratio
 
To correct back to the centreline, the pilot must reduce reverse thrust to reverse idle and release the
brakes. This will minimise the reverse thrust side force component, without the requirement to go through a full reverser actuating cycle, and provide the total tire cornering forces for realignment with the runway centreline. Rudder and differential braking should be used, as required, to correct back
to the runway centreline. When re-established on the runway centreline, the pilot should re-apply braking and reverse thrust as required.
 
NORMAL OPERATIONS
LANDING
 
Directional Control during Crosswind Landing
 
FACTORS AFFECTING LANDING DISTANCE
Applicable to: ALL
The field length requirements are contained in the FCOM PER,LND LANDING chapter . The landing distance margin will be reduced if the landing technique is not correct.
Factors that affect stopping distance include:
? Height and speed over the threshold
? Glide slope angle
? Landing flare technique
? Delay in lowering the nose on to the runway
? Improper use of braking system
? Runway conditions (discussed in adverse weather).
Height of the aircraft over the runway threshold has a significant effect on total landing distance. For example, on a 3 ° glide path, passing over the runway threshold at 100 ft altitude rather than 50 ft could increase the total landing distance by approximately 300 m/950 ft. This is due to the length of runway used before the aircraft touches down.
　
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本文鏈接地址：A330/A340 機組訓練手冊 FCTM Flight Crew Training Manual 2(12)