What is STAT INV on Airbus A330? (Static Inverter)

The Static Inverter, also known by its abbreviation STAT INV, is an essential component of the electrical system on the Airbus A330 aircraft. It plays a vital role in converting direct current (DC) power into alternating current (AC) power, which is necessary for the operation of various aircraft systems. In this article, we will delve deeper into the functionality and importance of the Static Inverter on the Airbus A330.

The Functionality of the Static Inverter

The Static Inverter on the Airbus A330 is primarily responsible for converting DC power from the aircraft’s battery bus into three-phase AC power. This conversion is crucial as it enables the distribution of AC power to essential aircraft systems such as avionics, cockpit displays, lighting, cabin services, and more. By providing a stable and reliable source of AC power, the Static Inverter ensures the proper functioning of these systems throughout the flight.

Within the electrical system of the Airbus A330, the Static Inverter operates at a frequency of 400 Hz, which is the standard frequency for most aircraft electrical systems. This frequency is higher than the usual 50 or 60 Hz found in household electrical systems. The higher frequency allows for the reduction of the size and weight of electrical equipment, making it more suitable for aviation applications where weight and space are critical factors.

In terms of design, the Static Inverter on the Airbus A330 consists of several components, including semiconductors, transformers, and electronic control circuits. These components work together to convert DC power into AC power and ensure its stable delivery to the aircraft systems. The semiconductors, such as transistors and diodes, facilitate the conversion process by controlling the flow of electrical current.

The Importance of the Static Inverter

The Static Inverter is of critical importance for the safe and efficient operation of the Airbus A330 aircraft. Without a functioning Static Inverter, the aircraft systems that rely on AC power would be unable to operate, leading to potentially severe consequences. For example, avionics systems, which include communication, navigation, and flight control systems, heavily depend on AC power to provide accurate and real-time information to the flight crew.

The failure of the Static Inverter can result in the loss of critical systems needed for a safe flight. Therefore, it is essential to ensure the reliability and integrity of the Static Inverter through regular maintenance, inspections, and testing. Any signs of malfunction or degraded performance should be addressed promptly to prevent further complications and potential aircraft downtime.

It is worth noting that the Airbus A330 is equipped with redundant electrical systems to enhance the overall reliability and redundancy in case of failures. Redundancy involves duplicating critical components or systems to ensure that a backup is available in the event of a primary system failure. This redundancy extends to the Static Inverter, where multiple units are installed to provide backup power conversion capabilities in case one unit malfunctions.

The redundancy of the Static Inverter contributes to the high level of safety and reliability of the Airbus A330 aircraft. If one Static Inverter fails, the remaining units can seamlessly take over and continue to supply AC power to the necessary systems. This redundancy significantly reduces the likelihood of complete power loss and helps maintain the aircraft’s critical systems in operational condition.


The Static Inverter, or STAT INV, on the Airbus A330 is a vital component of the aircraft’s electrical system. Its functionality in converting DC power into AC power ensures the proper functioning of various critical systems throughout the flight. The redundancy of the Static Inverter further enhances the safety and reliability of the Airbus A330, providing backup power conversion capabilities in case of failures.

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