What is A/SKID on Airbus A320? (Anti-Skid)

The Airbus A320 is a widely used aircraft in commercial aviation, known for its reliability, efficiency, and advanced technology. One of the key features that contributes to the safe operation of the A320 is the Anti-Skid system, also known as A/SKID. This system plays a crucial role in preventing wheel lock-up during landing, takeoff, and braking, ensuring optimal control and reducing the risk of accidents.

How Does Anti-Skid Work?

In simple terms, the Anti-Skid system on the Airbus A320 senses the rotational speed of each wheel during landing, takeoff, and braking. It constantly compares this speed with the aircraft’s actual speed, and if any wheel’s rotational speed exceeds the aircraft’s speed, the system takes immediate action to prevent that wheel from locking up.

The Anti-Skid system achieves this by modulating the hydraulic pressure to the brake units of the affected wheel, thereby adjusting the braking force applied to maintain traction and prevent skidding. This modulation is done rapidly and continuously, ensuring that the wheel’s rotational speed remains within acceptable limits throughout the landing roll or braking phase.

The Benefits of Anti-Skid on Airbus A320

Now that we understand the basic functioning of Anti-Skid on the Airbus A320, let’s explore the benefits it brings to the aircraft and its operation.

1. Increased Safety

Safety is the paramount concern in aviation, and the Anti-Skid system greatly enhances the safety of the Airbus A320. By preventing wheel lock-up, the system ensures that the aircraft maintains optimal control during critical phases of flight, such as landing and braking.

If a wheel were to lock up during landing, for example, it could lead to a loss of control or even a runway excursion. However, thanks to the Anti-Skid system’s ability to modulate the braking force, the A320’s wheels never reach a point where they are completely locked. This significantly reduces the risk of accidents and improves overall safety.

2. Improved Braking Efficiency

Another advantage of the Anti-Skid system is its ability to improve the overall braking efficiency of the Airbus A320. By preventing wheel lock-up, the system enables each wheel to provide maximum braking force without sliding or skidding.

When a wheel skids, it loses traction with the runway surface, resulting in reduced braking effectiveness. This not only increases the stopping distance but also poses a risk of directional instability. However, with the Anti-Skid system actively maintaining the rotational speed of each wheel, the braking efficiency of the A320 is maximized, allowing for shorter landing rolls and effective deceleration during landing or aborted takeoff.

3. Reduced Tire Wear

Tire wear is a common issue in aviation, and excessive wear can lead to costly replacements and increased maintenance requirements. The Anti-Skid system helps mitigate this problem by preventing wheel lock-up and excessive skidding.

When a wheel skids, the tire friction causes rapid wear, generating heat and degrading the tire’s surface. By maintaining the rotational speed within the required limits, the Anti-Skid system prevents excessive skidding, reducing tire wear and prolonging the lifespan of the aircraft’s tires. This translates to cost savings for the airline and improved operational efficiency.


The Anti-Skid system, or A/SKID, is a vital component of the Airbus A320, working tirelessly to ensure the safe and efficient operation of the aircraft. By preventing wheel lock-up, this system enhances safety, improves braking efficiency, and reduces tire wear.

As the aviation industry continues to prioritize safety and technological advancements, the Anti-Skid system remains a crucial feature in ensuring the secure and reliable performance of the Airbus A320.

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