What is P-SPEED on Airbus A320? (Profile Speed)

Profile Speed, also known as P-Speed, is a crucial concept in aviation, especially when it comes to operating the Airbus A320 aircraft. This term refers to the specific airspeed at which the aircraft should be operated during different phases of flight, such as climb, cruise, and descent. Understanding and adhering to the appropriate profile speeds is essential for maintaining optimal performance, efficiency, and safety.

Profile Speed Categories

The Airbus A320 aircraft has various profile speeds that are determined by the flight management system (FMS) and are based on factors like weight, altitude, and configuration. These profile speeds are categorized into three main categories: V-speeds, Green Dot Speed, and Minimum Clean Speed.


V-Speeds are critical indicators in aviation and are used to define important reference points for different phases of flight. They are typically expressed as multiples of the aircraft’s stall speed. Here are some important V-Speeds for the Airbus A320:

  • V1: The takeoff decision speed. It is the speed at which the pilot must decide whether to continue the takeoff or abort it in case of an emergency.
  • Vr: The rotation speed. It is the speed at which the pilot pulls back on the control column to lift the nose gear off the runway during takeoff.
  • V2: The takeoff safety speed. It is the speed at which the aircraft can climb safely after takeoff, even if it experiences an engine failure.
  • Vref: The approach reference speed. It is the speed at which the aircraft should be flown during final approach and landing.

Adhering to these V-Speeds is essential for the safe and efficient operation of the Airbus A320. Deviating from these speeds can affect the aerodynamic performance of the aircraft and compromise its ability to maintain stability and achieve desired performance goals.

Green Dot Speed

The Green Dot Speed, denoted by a small green dot on the airspeed indicator, is a unique profile speed on the Airbus A320. This specific speed represents the best lift-to-drag ratio for the aircraft and is primarily used during climb operations.

The Green Dot Speed is typically lower than the maximum climb speed and allows for the most efficient climb while minimizing fuel consumption. Operating the aircraft at the Green Dot Speed ensures optimal engine performance, reduces wear and tear on the engines, and improves the overall climb performance.

It’s important to note that the Green Dot Speed varies with different factors, such as aircraft weight, altitude, and configuration. The Flight Management System (FMS) calculates and provides the Green Dot Speed for each specific situation, allowing pilots to operate the aircraft at the most efficient climb speed.

Minimum Clean Speed

The Minimum Clean Speed is another profile speed that pilots must be aware of when operating the Airbus A320. This speed indicates the minimum airspeed at which the aircraft should be flown during the clean configuration, meaning when the flaps and slats are retracted.

Operating the aircraft below the Minimum Clean Speed can lead to significant penalties in terms of stability, control, and engine efficiency. It is crucial for pilots to ensure that the aircraft remains above this speed to maintain safe and stable flight conditions.

The Minimum Clean Speed is influenced by factors like aircraft weight and flight conditions. The Flight Management System (FMS) constantly calculates and provides the Minimum Clean Speed to the pilots, allowing them to operate the aircraft within the required parameters.


Profile Speeds play a vital role in operating the Airbus A320 aircraft efficiently and safely. Whether it’s adhering to the important V-Speeds or operating at the Green Dot Speed and Minimum Clean Speed, pilots must closely monitor and follow these profile speeds to ensure optimal performance and adherence to safety standards. The Flight Management System (FMS) provides accurate calculations of these speeds based on various factors, allowing pilots to make informed decisions and achieve the desired flight characteristics.

By understanding and implementing the appropriate profile speeds, pilots can optimize fuel consumption, enhance climb performance, and maintain stability throughout the aircraft’s flight envelope. Profile speed management is a critical aspect of operating the Airbus A320 and contributes to safe and efficient aviation operations.

For More: What is EVMU on Airbus A320? (Engine Vibration Monitoring Unit)