What is ABN on Airbus A320? (Abnormal)

The Airbus A320 is a popular narrow-body aircraft that is widely used by airlines around the world. While it is known for its reliability and safety, there are certain abnormalities that can occur with this aircraft. In this article, we will explore some of the common abnormal situations that can arise on an Airbus A320 and how they are addressed.

Abnormalities and Their Impact on Aircraft Operations

Abnormalities, or ABNs, on the Airbus A320 refer to situations that deviate from normal operations and may require special attention or action. These ABNs can range from minor issues to more significant problems that may affect the performance or safety of the aircraft.

One common abnormality that can occur on the Airbus A320 is an engine-related issue. This can include engine failure, loss of thrust, or abnormal engine indications. These situations can be caused by various factors such as mechanical failure, fuel system problems, or even bird strikes. Engine abnormalities can severely impact the aircraft’s ability to maintain its intended flight path and may require the crew to take immediate action to mitigate the issue.

Another abnormality that can occur is related to the aircraft’s electrical systems. Electrical abnormalities can manifest in various ways, such as failures in the aircraft’s power supply, lighting systems, or avionics equipment. These issues can disrupt the aircraft’s navigation, communication, or even emergency systems, posing a potential risk to the flight operations. It is crucial for the crew to identify and rectify any electrical abnormalities to ensure the safe operation of the Airbus A320.

One more common abnormality that can affect the Airbus A320 is related to hydraulic systems. The aircraft relies on hydraulic pressure to control various components, such as the landing gear, flight controls, and brakes. Any abnormality in the hydraulic systems, such as leaks or loss of pressure, can impair the aircraft’s ability to maneuver properly or maintain its overall structural integrity. Detecting and addressing hydraulic abnormalities promptly is vital to ensure the safe operation of the Airbus A320.

Addressing and Resolving Abnormalities

When an abnormality occurs on an Airbus A320, the crew follows specific procedures outlined by the aircraft manufacturer and approved by aviation authorities such as the Federal Aviation Administration (FAA) or the European Union Aviation Safety Agency (EASA). These procedures provide guidance on how to assess, address, and resolve various abnormal situations.

For example, in the event of an engine-related abnormality, the crew will consult the aircraft’s Quick Reference Handbook (QRH) to identify the appropriate checklist. The QRH contains checklists for various abnormal situations, including engine failures or malfunctions. These checklists guide the crew on the necessary actions to take to troubleshoot the issue and restore the aircraft to normal operation.

In the case of electrical abnormalities, the crew may consult the aircraft’s Electrical System Description and Operation manual, which provides detailed information on the functioning of the electrical systems and troubleshooting procedures. The manual includes diagrams, explanations, and step-by-step instructions to assist the crew in identifying and rectifying any electrical abnormalities.

Similarly, for hydraulic abnormalities, the crew will refer to the Airbus A320’s Hydraulic System Description and Operation manual, which outlines the functioning of the hydraulic systems and steps to take in the event of an abnormality. This manual helps the crew diagnose the issue and perform the necessary actions to rectify the abnormality promptly.

It is worth mentioning that in some cases, the crew may need to consult with maintenance personnel or contact the airline’s operations control center for further guidance or assistance in resolving the abnormality. These additional resources provide expertise and support to ensure that any abnormality is addressed effectively and in accordance with regulations and safety standards.


The Airbus A320, like any other aircraft, may encounter abnormal situations during its operation. These abnormalities can range from engine-related issues to electrical or hydraulic malfunctions. However, the aircraft manufacturer provides comprehensive documentation and procedures designed to assist the crew in addressing and resolving these abnormalities promptly and safely. By following these procedures and leveraging available resources, the crew can mitigate the impact of any abnormality and ensure the continued safe operation of the Airbus A320.

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