What is MAT on Boeing 737? (Maintenance Access Terminal)

The maintenance access terminal (MAT) on the Boeing 737 aircraft is an essential component that facilitates maintenance operations and provides access to critical aircraft systems. As an integral part of the aircraft’s overall design, the MAT enables maintenance personnel to access important information, perform diagnostic tests, and carry out necessary repairs. It serves as a central hub for communication between the aircraft and ground maintenance teams, ensuring efficient and accurate maintenance procedures.

The MAT, also known as the central maintenance computer (CMC), is responsible for managing and coordinating various maintenance functions. It collects data from different onboard systems, analyzes it, and presents actionable information to maintenance technicians. By leveraging advanced technology, the MAT streamlines maintenance processes, reduces downtime, and enhances the overall safety and reliability of the Boeing 737 aircraft.

The role of the maintenance access terminal

The maintenance access terminal plays a vital role in ensuring the operational readiness of the Boeing 737 aircraft. Here are some key functions and features of the MAT:

The MAT as an information hub

The maintenance access terminal serves as a centralized information hub, collecting and processing data from various onboard systems. It provides maintenance personnel with real-time information about the aircraft’s status, performance, and health. From engine parameters to flight control system inputs, the MAT captures and presents crucial data that can aid in troubleshooting and decision-making.

For example, the MAT can monitor the health of the aircraft’s engines, alerting maintenance teams to any abnormalities or impending issues. By analyzing engine performance data, such as temperatures, pressures, and vibration levels, the MAT can identify potential faults or imminent failures. This proactive approach allows maintenance technicians to address problems before they become critical, resulting in improved safety and reliability.

Furthermore, the MAT provides access to system documentation, technical manuals, and maintenance procedures. Through an intuitive user interface, maintenance personnel can quickly access the necessary information to perform their tasks effectively. This reduces reliance on bulky paper documents and enables efficient information retrieval, saving valuable time during maintenance operations.

The MAT and diagnostic capabilities

Another crucial aspect of the maintenance access terminal is its diagnostic capabilities. The MAT can run comprehensive diagnostic tests on various aircraft systems, helping maintenance teams identify and resolve issues accurately and efficiently.

For instance, when there is an indication of an electrical problem, maintenance personnel can use the MAT to perform a comprehensive electrical system test. The MAT collects data from the aircraft’s electrical system, analyzes it, and generates diagnostic reports that pinpoint the location and nature of the problem. This diagnostic information assists technicians in troubleshooting the issue and applying appropriate remedial measures, minimizing the aircraft’s downtime.

The MAT also facilitates the monitoring and recording of aircraft systems’ performance data. It continuously collects and stores data from various sensors and systems, creating a comprehensive database of the aircraft’s operational history. This data can be invaluable in detecting recurring issues, trends, or anomalies, allowing maintenance teams to implement preventive maintenance measures and reduce the likelihood of future failures.

Real-time communication and collaboration

Effective communication and collaboration between aircraft maintenance teams and ground personnel are essential for efficient maintenance operations. The maintenance access terminal enables real-time communication and collaboration through various interfaces and communication protocols.

With built-in wireless connectivity, the MAT can establish a connection with off-board systems and transmit data in real-time. This allows maintenance personnel to share information, seek guidance, and receive remote support from technical experts located anywhere in the world. Remote troubleshooting, guidance through maintenance procedures, and access to specialized knowledge can significantly enhance the efficiency and effectiveness of aircraft maintenance.

Additionally, the MAT can interface with external diagnostic tools and ground-based maintenance systems, ensuring seamless integration of data and information. This integration promotes efficient collaboration between different stakeholders involved in the maintenance of the Boeing 737 aircraft, streamlining processes and reducing manual input errors.


The maintenance access terminal (MAT) on the Boeing 737 aircraft is a critical component that facilitates maintenance operations and ensures the aircraft’s operational readiness. From providing real-time information and diagnostic capabilities to enabling real-time communication and collaboration, the MAT plays a vital role in enhancing maintenance efficiency, reducing downtime, and improving the overall safety and reliability of the aircraft.

As aircraft technology continues to advance, the MAT will likely evolve, incorporating more sophisticated features and capabilities. Its ability to collect, process, and present actionable data will become even more crucial in ensuring optimal operational performance and minimizing maintenance-related disruptions.

Overall, the maintenance access terminal is a testament to the aviation industry’s continuous efforts to integrate advanced technology and improve maintenance practices, ultimately benefiting the safety, reliability, and efficiency of the Boeing 737 aircraft.

For More: What is EADI on Boeing 737? (Electronic Attitude Display Indicator)