What is A/S in Aviation? (Anti-Skid)

In the world of aviation, safety is paramount. Every part of an aircraft is meticulously designed and engineered to ensure the highest levels of safety and performance. One crucial component that contributes to safe landings is the anti-skid system, commonly known as A/S (Anti-Skid). This technology plays a vital role in preventing the wheels of an aircraft from skidding during landing or braking, enhancing the overall safety of flights.

How Does Anti-Skid Work?

The purpose of the anti-skid system is to prevent the aircraft’s wheels from locking up or sliding on the runway surface when braking or landing. Without this system, friction between the tires and the runway can lead to skidding, which can result in loss of control and dangerous situations. The anti-skid system uses various sensors and valves to detect when a wheel is about to lock up and applies hydraulic pressure to the brake system, releasing and reapplying the brakes rapidly.

When a pilot initiates braking during landing or on the ground, the anti-skid system measures the rotational speed of each wheel. If one or more wheels are decelerating at a faster rate than the others, indicating a potential skid, the system intervenes. It quickly releases and reapplies the brakes on the wheels experiencing higher deceleration, allowing them to regain traction and preventing them from locking up.

This rapid cycling of the brake pressure continues until all the wheels are rotating at the same rate, ensuring maximum traction and preventing skidding. By providing optimal braking force distribution, the anti-skid system allows pilots to achieve shorter stopping distances and better control during emergency situations.

Advantages of Anti-Skid System

The incorporation of anti-skid systems in aircraft has revolutionized aviation safety by reducing the risk of runway excursions and enhancing overall braking performance. Here are some of the notable advantages of the anti-skid system:

1. Enhanced Safety: The anti-skid system significantly improves safety during landing and braking by preventing wheels from skidding. This helps maintain control of the aircraft and minimizes the risk of accidents.

2. Shorter Stopping Distances: By rapidly releasing and reapplying the brakes, the anti-skid system optimizes braking performance, allowing aircraft to stop in shorter distances. This is crucial during emergency situations or when landing on shorter runways.

3. Better Tire Life: Skidding can cause excessive tire wear and damage. With the anti-skid system in place, the wheels maintain traction, reducing tire slippage and ensuring longer tire life.

4. Improved Control: The anti-skid system provides pilots with better control over the aircraft during braking maneuvers. It allows for precise modulation of the brakes, enhancing overall handling and reducing the chances of directional instability.

These advantages highlight the importance of the anti-skid system in aviation, where safety and control are paramount.

Anti-Skid System – A Crucial Component in Aviation

The anti-skid system, abbreviated as A/S, is an integral part of modern aircraft. Its implementation has become standard in commercial and military aviation to ensure the utmost safety and improve braking performance. Without the anti-skid system, the risk of accidents due to skidding would be significantly higher.

Airplanes undergo rigorous certification processes, and the anti-skid system is a mandatory requirement for these certifications. The Federal Aviation Administration (FAA) and other regulatory bodies impose strict guidelines for the installation and operation of anti-skid systems in all types of aircraft.

The ongoing advancements in technology have led to the development of advanced anti-skid systems, capable of providing even greater safety and performance. Alongside the primary function of preventing skidding, these systems offer additional features such as anti-lock braking (ABS) and integration with other avionics systems for improved overall aircraft control.

It is worth noting that the anti-skid system is not limited to commercial airliners. It is also a critical component in military aircraft, where precision and control are of utmost importance. The system enables pilots to land safely on shorter runways, even during adverse weather conditions.


The anti-skid system is an indispensable technology in aviation, playing a crucial role in maintaining safe landings and improving braking performance. By preventing skidding and optimizing braking force distribution, it enhances the overall safety of flights, reduces stopping distances, and provides pilots with better control over their aircraft.

The continuous development of anti-skid systems ensures that aviation remains at the forefront of safety and performance. As technology evolves, these systems will continue to evolve, providing even greater benefits for pilots and passengers alike.

For More: What is ETSO in Aviation? (“European Technical Standard Order)