What is QT on Airbus A330? (Quart)

The Airbus A330 is a versatile wide-body aircraft known for its efficiency, comfort, and reliability. It is widely used by airlines around the world for both short and long-haul flights. One important feature of the A330 is its Quart system, abbreviated as QT, which plays a crucial role in ensuring the safety and performance of the aircraft.

In this article, we will explore what the Quart system on the Airbus A330 is, its purpose, and its significance in maintaining the highest standards of aviation safety.

The Quart System: Ensuring Optimal Fuel Efficiency

The Quart system on the Airbus A330 is primarily responsible for the monitoring and management of fuel on board the aircraft. The term “Quart” itself stands for “Quantity Assurance of Refuelled Tanks.” It is a sophisticated system that ensures accurate measurement and management of fuel quantities, helping the aircraft to operate with optimal fuel efficiency.

During the refueling process, the Quart system constantly measures the fuel entering the aircraft’s tanks and compares it with the quantity indicated by the refueler. This ensures that the correct amount of fuel is being loaded, reducing the risk of under or overfilling the tanks. The system also takes into account factors such as temperature, density, and fuel expansion, which can affect the fuel volume.

The Quart system continuously tracks and updates the fuel quantity information, providing real-time data to the flight crew. This information is crucial for flight planning, calculating the aircraft’s performance, and determining the fuel consumption rate during the flight.

Apart from precise fuel measurement, the Quart system also includes sensors that monitor the fuel levels, allowing the flight crew to be alerted in case of any abnormality, such as a fuel leak or imbalance between the fuel tanks. These sensors contribute to the overall safety of the aircraft by providing early warnings and preventing potential incidents related to fuel systems.

The Importance of Quart in Aviation Safety

The Quart system plays a critical role in ensuring aviation safety, especially in terms of accurate fuel measurement and management. Proper fuel quantity assurance is essential for several reasons:

  • Weight and Balance: Ensuring the correct distribution of fuel across the aircraft is crucial for maintaining proper weight and balance. The Quart system helps achieve this balance by accurately measuring and tracking the fuel quantities in each tank.
  • Performance Calculation: Fuel consumption is a key factor in calculating the aircraft’s performance, including range, speed, and endurance. The Quart system provides real-time data on fuel consumption, allowing the flight crew to make informed decisions regarding flight planning and fuel management.
  • Emergency Situations: In the event of an emergency, knowing the precise amount of fuel on board is vital for making critical decisions, such as diverting to an alternate airport. The Quart system enables the flight crew to have accurate and up-to-date information on fuel availability.

Overall, the Quart system enhances the operational efficiency and safety of the Airbus A330 by ensuring accurate fuel measurement, optimal fuel management, and early detection of any fuel-related anomalies.


The Quart system, abbreviated as QT, is a vital component of the Airbus A330 aircraft. It serves the critical function of monitoring and managing fuel quantities, contributing to optimal fuel efficiency, and enhancing aviation safety. Through its accurate measurement, real-time data provision, and early warning capabilities, the Quart system plays a significant role in the overall performance and reliability of the A330 aircraft.

For more information on the Airbus A330 and its Quart system, you can visit the official Airbus website here.

For More: What is ATE on Airbus A330? (Automated Test Equipment)