What is PCT on Boeing 737? (Percent)

The Boeing 737 aircraft is a popular and widely used aircraft in the aviation industry. As with any aircraft, it is important to understand the various technical aspects and terminology used in relation to this aircraft. One such term used in the context of the Boeing 737 is “Percent” (abbreviated as PCT). In this article, we will explore and explain what Percent means in relation to the Boeing 737.

The Importance of Percent on Boeing 737

In the context of the Boeing 737, Percent is often used to refer to the aircraft’s performance and system parameters. It is a way to express certain values as a percentage, providing a clear indication of the situation or condition being measured. Percent values can vary depending on the specific parameter being discussed, and understanding them is crucial for pilots, engineers, and aviation professionals.

Percent of Fuel Remaining

One important use of Percent on the Boeing 737 is to measure the remaining fuel on board the aircraft. This is an essential parameter for flight planning and ensuring that the aircraft has enough fuel to complete its journey safely. The fuel remaining is often expressed as a percentage of the total fuel capacity of the aircraft.

For example, if a Boeing 737 has a total fuel capacity of 30,000 gallons, and the remaining fuel is 18,000 gallons, the percent of fuel remaining would be calculated as follows:

Percent of Fuel Remaining = (Remaining Fuel / Total Fuel Capacity) x 100

Using the values from the example given above:

Percent of Fuel Remaining = (18,000 gallons / 30,000 gallons) x 100 = 60%

This calculation provides a clear and concise representation of the fuel remaining in the aircraft, allowing pilots and operators to make informed decisions regarding refueling and flight planning.

Percent of Maximum Takeoff Weight

Another significant use of Percent on the Boeing 737 is to measure the aircraft’s weight in relation to its maximum takeoff weight (MTOW). The MTOW is the maximum weight at which the aircraft can safely take off and operate. It is crucial to ensure that the aircraft’s weight remains within the permitted limits for safe flight.

The percent of maximum takeoff weight is calculated by comparing the actual weight of the aircraft to its maximum takeoff weight:

Percent of Maximum Takeoff Weight = (Actual Weight / Maximum Takeoff Weight) x 100

By expressing this value as a percentage, pilots and operators can easily determine whether the aircraft is within the allowable weight limits for a safe takeoff. It is important to note that exceeding the maximum takeoff weight can have serious consequences on the aircraft’s performance and safety.

Percent of Flap Extension

Flaps are an important aerodynamic device located on the wings of an aircraft, including the Boeing 737. They help generate additional lift and allow for safer takeoffs and landings. The percent of flap extension refers to the position or degree at which the flaps are extended during different phases of flight, such as takeoff and landing.

The Boeing 737 has several distinct flap settings, each corresponding to a specific percentage of flap extension. These settings are carefully calculated to optimize the aircraft’s performance at different stages of flight. The percent of flap extension is typically displayed on the aircraft’s cockpit instruments for the pilot’s reference.

For example, a flap setting of 5 degrees may represent 10% of flap extension, while a setting of 30 degrees may represent 75% of flap extension. These values can vary depending on the specific model and variant of the Boeing 737 aircraft.


In conclusion, Percent (PCT) on the Boeing 737 is a term used to express various performance and system parameters as a percentage. It is commonly used to measure the remaining fuel, the weight in relation to the maximum takeoff weight, and the degree of flap extension. Understanding and monitoring these percent values is vital for safe and efficient flight operations.

For more information on the technical specifications and operational procedures of the Boeing 737, refer to the official Boeing website here.

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