What is REP on Boeing 737? (Repellent)

When it comes to aviation, safety is of utmost importance. Aerospace companies continuously strive to enhance safety features to ensure a secure and efficient flying experience for passengers. One crucial aspect of aviation safety is the use of repellent substances on aircraft surfaces. In the case of Boeing 737 aircraft, a specialized repellent known as REP (Repellent) is utilized to provide valuable protection.

The Role of Repellent (REP) on Boeing 737

Repellent, or REP, is a specially formulated substance that is applied to the surfaces of Boeing 737 aircraft. Its primary role is to repel water, oil, and contaminants, effectively preventing them from adhering to the aircraft’s exterior. This repellent coating is crucial for maintaining the aircraft’s structural integrity, reducing drag, and ensuring optimal performance.

Water is one of the main elements that the repellent coating protects against. When water accumulates on the surfaces of an aircraft, it can significantly affect its performance. Increased weight from water buildup can lead to a reduction in fuel efficiency and overall flight performance. Additionally, water accumulation on critical surfaces, such as the wings and tail, can disrupt the smooth airflow necessary for stable flight.

Benefits of Repellent (REP) on Boeing 737

The application of REP on Boeing 737 aircraft offers numerous benefits. Let’s delve into some of the advantages provided by this specialized coating:

1. Improved Fuel Efficiency

By repelling water and other contaminants, REP reduces the weight burden on the aircraft. This reduction in weight directly translates to improved fuel efficiency. With the optimized aerodynamics resulting from the repellent coating, the Boeing 737 can fly more efficiently, consuming less fuel and reducing its environmental impact.

2. Enhanced Durability

Boeing 737 aircraft endure various environmental conditions during their operations, including exposure to rain, snow, and other corrosive elements. The application of REP helps protect the aircraft’s surfaces from corrosion and erosion caused by these factors. This, in turn, enhances the aircraft’s durability and prolongs its lifespan, reducing maintenance costs for airlines.

3. Reduced Maintenance Requirements

By minimizing the adherence of contaminants such as dust and dirt, REP reduces the frequency and complexity of maintenance required on Boeing 737 aircraft. The repellent coating acts as a barrier against external particles, making cleaning and upkeep more manageable and cost-effective for airlines. This ultimately leads to improved aircraft availability and schedule reliability, benefiting both airlines and passengers.

Application and Maintenance of Repellent (REP)

The application of REP is not a one-time process. Aerospace companies ensure the continuous protection of Boeing 737 aircraft surfaces by regularly reapplying the repellent coating. This maintenance step ensures that the coating remains effective in repelling water, oil, and contaminants.

The process of applying REP involves thoroughly cleaning and preparing the aircraft’s surfaces before applying the protective coating. Aerospace technicians follow specific guidelines and procedures to achieve the desired results. The use of specialized equipment and trained personnel is essential to ensure the optimal application of REP.

Maintaining Safety Standards with REP on Boeing 737

Boeing 737 aircraft are designed and manufactured with strict adherence to safety standards. The application of REP further enhances these safety measures by protecting the aircraft from factors that can compromise its integrity and performance. Proper maintenance and inspection procedures are crucial for ensuring the continued effectiveness of the repellent coating.

Ongoing evaluation and monitoring of the REP coating’s performance are essential for identifying any potential issues or degradation. This includes routine inspections and assessments to verify the integrity of the coating. Any necessary repairs or reapplications must be conducted promptly to maintain the highest safety standards.

Boeing and other aerospace companies collaborate with regulatory authorities and follow industry guidelines to ensure that REP and other safety features meet the required standards. Continuous research and development efforts are also undertaken to enhance the effectiveness and longevity of the repellent coating, providing even greater protection for Boeing 737 aircraft.


Repellent (REP) plays a crucial role in enhancing the safety and performance of Boeing 737 aircraft. By repelling water, oil, and other contaminants, this specialized coating improves fuel efficiency, enhances durability, and reduces maintenance requirements. The application and maintenance of REP are vital for maintaining the highest safety standards and ensuring the continued protection of the aircraft surfaces.

For More: What is TMS on Boeing 737? (Thrust Management System)