What is TPIS on Boeing 737? (Tire Pressure Indication System)

The Tire Pressure Indication System (TPIS) is an essential component of the Boeing 737 aircraft that monitors and reports the tire pressure of its tires. It plays a crucial role in ensuring the safety and performance of the aircraft during takeoff, landing, and in-flight operations. The TPIS provides real-time information about the tire pressure to the flight crew, allowing them to promptly identify and address any deviations or abnormalities.

TPIS utilizes advanced sensors and electronic systems to measure the pressure inside each tire and transmit the data to the cockpit. It is designed to maintain optimal tire performance and mitigate the risks associated with underinflated or overinflated tires, such as reduced brake effectiveness, increased tire wear, and potential blowouts. By continuously monitoring tire pressure, the TPIS enables the flight crew to make data-driven decisions and take appropriate actions to ensure the safe operation of the aircraft throughout its flight.

How does the Tire Pressure Indication System work?

The Tire Pressure Indication System on the Boeing 737 consists of various components that work together to provide accurate tire pressure readings. These components include:

1. Tire Pressure Sensors: Each tire in the aircraft’s landing gear system is equipped with a tire pressure sensor. These sensors continuously measure the pressure inside the tire and transmit the data to the TPIS computer system.

2. TPIS Computer System: The tire pressure data received from the sensors is processed and analyzed by the TPIS computer system. It calculates the tire pressure values based on the sensor inputs and displays the information on the cockpit instrument panel.

3. Cockpit Instrument Panel: The tire pressure information is presented to the flight crew through dedicated indicators on the cockpit instrument panel. These indicators display the tire pressure values in a clear and easily readable format, allowing the crew to quickly identify any anomalies.

4. Warning Systems: The TPIS is integrated with the aircraft’s warning systems to provide alerts and notifications to the flight crew in case of abnormal tire pressure conditions. These warnings help the crew take immediate corrective actions and prevent potential tire-related incidents during flight.

The accurate tire pressure readings provided by the TPIS are crucial for maintaining the Boeing 737’s optimal performance and safety standards. They enable the flight crew to make informed decisions regarding tire maintenance, landing gear operations, and overall aircraft safety.

The Importance of Tire Pressure on Aircraft

Proper tire pressure is critical for the safe operation of an aircraft like the Boeing 737. It directly affects the aircraft’s performance, handling characteristics, and overall safety. Here are some key reasons why maintaining the correct tire pressure is crucial:

1. Aircraft Performance: Improperly inflated tires can significantly impact the aircraft’s performance, leading to decreased fuel efficiency and increased drag. Maintaining optimal tire pressure ensures the aircraft operates at peak performance, maximizing fuel economy and reducing operating costs.

2. Safety: Tire blowouts or failures can pose serious safety risks during takeoff, landing, and in-flight. Adequate tire pressure reduces the chances of a blowout and enhances the overall safety of the aircraft. The TPIS plays a vital role in monitoring and alerting the flight crew about any abnormal tire pressure conditions, allowing them to take immediate corrective actions to mitigate the risks.

3. Tire Wear: Incorrect tire pressure can lead to uneven wear and premature tire failure. Underinflated tires are prone to excessive wear on the sidewalls, while overinflated tires may wear out more quickly in the center. By maintaining the correct tire pressure, the TPIS helps extend the lifespan of the tires, reducing maintenance costs and improving overall reliability.

4. Brake Effectiveness: Properly inflated tires ensure effective braking performance, especially during landing and ground operations. Underinflated tires can lead to longer braking distances, reduced braking efficiency, and increased wear on the aircraft’s braking system. The TPIS continuously monitors the tire pressure, enabling the flight crew to take appropriate actions to maintain optimal braking performance and safety.

By considering and maintaining the correct tire pressure, airlines and flight crews can enhance the safety, efficiency, and overall performance of Boeing 737 aircraft. The TPIS provides the necessary tools and information to ensure that tire pressure is monitored and maintained within safe operating limits throughout the aircraft’s operational life.


The Tire Pressure Indication System (TPIS) is a crucial component of the Boeing 737 aircraft, providing real-time tire pressure information to the flight crew. By continuously monitoring tire pressure, the TPIS helps maintain optimal aircraft performance, safety, and reliability. It enables the flight crew to promptly identify any deviations or abnormalities, take appropriate actions, and prevent potential tire-related incidents. Proper tire pressure is essential for the safe operation of the aircraft, affecting performance, safety, and tire lifespan. The TPIS ensures that tire pressure is accurately measured, displayed, and monitored throughout the aircraft’s operational life. It plays a vital role in maintaining the highest standards of safety and operational efficiency for the Boeing 737 aircraft.

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