What is CG on Boeing 737? (Center Of Gravity)

The Center of Gravity (CG) is a critical concept in aviation that plays a crucial role in the safe and efficient operation of an aircraft like the Boeing 737. It refers to the point at which the complete weight of the aircraft is considered to be concentrated. Understanding the center of gravity and its implications is essential for pilots, engineers, and anyone involved in the design, maintenance, or operation of the Boeing 737.

Importance of Maintaining the Center of Gravity

The center of gravity of an aircraft directly affects its stability and control. It is essential to maintain the center of gravity within specific limits to ensure the aircraft’s proper balance and performance. Failure to do so can impact its flight characteristics and compromise safety.

On the Boeing 737, the location of the center of gravity is carefully calculated and monitored to ensure optimal performance throughout each flight phase, including takeoff, climb, cruise, descent, and landing.

Factors Affecting the Center of Gravity on the Boeing 737

The center of gravity on the Boeing 737 is influenced by several factors, including:

1. Passenger and Cargo Loading: The distribution of passengers and cargo on the aircraft can significantly impact the center of gravity. Proper weight distribution is crucial to maintain balance.

2. Fuel Quantity: The amount and distribution of fuel on the aircraft also affect the center of gravity. Fuel tanks are strategically located to maintain balance during different flight phases.

3. Equipment Placement: The placement and weight of equipment, such as seats, galley, lavatories, and avionics, can influence the center of gravity. Design considerations ensure these components are appropriately positioned.

The Role of the Center of Gravity in Aircraft Stability and Control

The center of gravity plays a vital role in determining the stability and control characteristics of the Boeing 737. Here’s how:

1. Stability: The location of the center of gravity affects the aircraft’s stability. A forward center of gravity provides greater stability, making the aircraft more resistant to pitch changes. Conversely, a rearward center of gravity can decrease stability, making the aircraft more maneuverable but potentially less stable.

2. Control: The center of gravity also affects the control feel and handling characteristics of the aircraft. Proper center of gravity positioning allows pilots to easily control the aircraft during various maneuvers, such as takeoff, landing, and banking.

It’s important to note that the location of the center of gravity within the prescribed limits is critical for safe flight. Operating outside these limits can lead to difficulties in controlling the aircraft and may result in instability or loss of control.

Calculating and Monitoring the Center of Gravity on the Boeing 737

To determine the center of gravity on the Boeing 737, precise calculations and weight measurements are performed. These calculations take into account the weight and positioning of passengers, cargo, and fuel, as well as other contributing factors.

During pre-flight preparations, the pilot or loadmaster uses specific charts or computer programs provided by the aircraft manufacturer to calculate the aircraft’s center of gravity. These tools help ensure that the center of gravity falls within the prescribed limits for safe flight.

Once the aircraft is loaded and ready for departure, the center of gravity is cross-checked by comparing the calculated values with the actual measurements. This verification process ensures that the aircraft is within the approved limits and ready for flight.

Safeguarding the Center of Gravity on the Boeing 737

The Boeing 737 is designed with various safeguards to prevent the center of gravity from exceeding the prescribed limits during flight. These precautions include:

1. Load Limitations: The Boeing 737 has specific weight and balance limitations to prevent the center of gravity from falling outside the safe range. These limitations ensure that the aircraft remains balanced and controllable.

2. Computerized Systems: Advanced computerized systems on the Boeing 737 provide real-time monitoring and alerts regarding the center of gravity. Pilots receive visual and auditory warnings if the center of gravity exceeds the safe limits.

3. Standard Operating Procedures: The Boeing 737 operations manual includes detailed procedures for loading, weight distribution, and center of gravity management. These procedures guide pilots and ground crew to maintain safe center of gravity limits.

The center of gravity on the Boeing 737 is a critical parameter that must be carefully managed to ensure safe and efficient flight operations. Understanding its significance and adhering to proper procedures contribute to the overall safety and performance of the aircraft.


The center of gravity is a vital consideration in the design, operation, and maintenance of the Boeing 737 aircraft. It directly affects the stability, control, and overall performance of the aircraft. Adhering to specified limits and utilizing accurate calculations and monitoring techniques ensures safe and efficient flight operations. By understanding the importance of the center of gravity and implementing proper procedures, pilots, engineers, and crew members contribute to the continuous improvement of aviation safety.

For More: What is SPL on Boeing 737? (Splice List)