What is XMTR on Boeing 737? (Transmitter)

The Boeing 737 is a popular aircraft that has revolutionized the aviation industry. As with any modern aircraft, it is equipped with numerous systems and components that ensure its safe and efficient operation. One such component is the Transmitter, often abbreviated as XMTR, which plays a crucial role in the aircraft’s communication and navigation systems.

In this article, we will explore the Transmitter on the Boeing 737, its functions, and its importance in ensuring the smooth operation of the aircraft. We will delve into the technical aspects of this component and discuss its role in maintaining communication between the aircraft and ground control, as well as its contribution to navigation systems.

The Role of Transmitter in Communication

The Transmitter on the Boeing 737 is responsible for transmitting signals and data between the aircraft and external entities, such as air traffic control and other aircraft. It is a crucial component of the communication system, ensuring seamless and efficient communication in the highly dynamic aviation environment.

One of the primary functions of the Transmitter is to send and receive radio signals. These signals facilitate voice communication between the pilot and air traffic control, allowing for the exchange of important information such as flight plans, weather updates, and navigation instructions. The Transmitter ensures that these signals are transmitted clearly and reliably, enabling effective coordination and ensuring the safety of the aircraft.

Additionally, the Transmitter also plays a role in the transmission of data. In modern aviation, data communication has become increasingly important for efficient operations. The Transmitter helps transmit data packets containing essential information, such as position reports, altitude information, and system status updates. This data exchange is essential for traffic management, conflict resolution, and overall situational awareness in the aviation ecosystem.

The Importance of Transmitter in Navigation

In addition to its role in communication, the Transmitter on the Boeing 737 also contributes significantly to the aircraft’s navigation systems. It helps ensure accurate positioning, guidance, and navigation throughout the flight.

One of the key navigation systems that rely on the Transmitter is the Automatic Direction Finder (ADF). The ADF allows pilots to determine the direction of a radio station and aids in navigation, especially in areas where other navigation aids may be limited. The Transmitter provides the necessary signals for the ADF to function accurately, giving pilots the information they need to navigate successfully.

Furthermore, the Transmitter also plays a role in the operation of the VHF Omnidirectional Range (VOR) system. The VOR system provides pilots with crucial information about their aircraft’s radial position from a ground-based station. It allows for precise navigation along predetermined airways and approaches. The Transmitter ensures that the VOR signals are transmitted clearly, enabling pilots to accurately interpret their position and navigate accordingly.


The Transmitter, abbreviated as XMTR, is an essential component of the Boeing 737. It plays a crucial role in the aircraft’s communication and navigation systems, ensuring seamless communication with ground control and contributing to accurate navigation throughout the flight. By understanding the functions and importance of the Transmitter on the Boeing 737, we can appreciate the intricate systems that allow these aircraft to operate safely and efficiently.

For More: What is LVDT on Boeing 737? (Linear Variable Differential Transducer)