What is PCH on Boeing 737? (Patch)

A patch, also known as a PCH (Patched Component History) in the aviation industry, refers to a modification or repair made to the Boeing 737 aircraft. These patches are crucial for maintaining the airworthiness and safety of the aircraft, ensuring that any identified issues or flaws are rectified promptly. In this article, we will delve into the significance of patches on Boeing 737s, their purpose, and how they contribute to the overall maintenance and performance of these iconic aircraft.

Importance of Patches on Boeing 737

The Boeing 737 is one of the most widely used commercial aircraft globally, known for its reliability, efficiency, and safety. However, as with any complex piece of machinery, issues may arise over time that require attention and rectification. Patches play a crucial role in addressing these issues by providing a solution or repair that enhances the safety and performance of the aircraft.

These patches are typically developed and released by the aircraft manufacturer, Boeing, in collaboration with aviation regulatory authorities such as the Federal Aviation Administration (FAA) and the European Union Aviation Safety Agency (EASA). They are based on thorough investigations, testing, and analysis of any potential vulnerabilities or problems that have been identified.

Implementing Patches on Boeing 737

The process of implementing patches on Boeing 737 aircraft involves a systematic approach to ensure the modifications are carried out effectively and safely. The following steps are generally followed:

1. Patch Identification and Release

Once an issue or vulnerability is identified in a specific component or system of the Boeing 737, engineers and experts work diligently to develop a patch. This includes thoroughly investigating the root cause of the problem, designing a solution, and conducting extensive testing to ensure its effectiveness.

2. Regulatory Approval

Before a patch can be implemented, it must receive regulatory approval from authorities such as the FAA or EASA. These regulatory bodies evaluate the proposed patch to ensure that it meets all safety standards and will effectively address the identified issues.

3. Implementation and Verification

After receiving regulatory approval, the patch is implemented on the affected Boeing 737 aircraft. This process typically involves trained and certified maintenance personnel who follow strict guidelines and procedures provided by the manufacturer. Once the patch is applied, thorough verification and testing are conducted to ensure the successful resolution of the identified issue.

4. Documentation and Reporting

Every patch implemented on a Boeing 737 is meticulously documented as a part of the PCH (Patched Component History). This documentation includes details of the patch, the reason for its implementation, and any relevant testing or verification results. These records are critical for tracking the maintenance history of the aircraft and providing insights for future modifications or repairs.

It is important to note that patches are not limited to addressing issues; they can also be implemented for performance enhancements, operational improvements, or compliance with regulatory directives. Regardless of the reason, implementing patches ensures that the Boeing 737 remains a reliable and safe aircraft.


Patches, or PCHs, on the Boeing 737 aircraft are essential for maintaining airworthiness, addressing identified issues, and ensuring safety and performance. These modifications and repairs are developed by aircraft manufacturers, rigorously tested, and approved by regulatory bodies before being implemented by qualified maintenance personnel. The detailed documentation of patches provides crucial information for future maintenance and improvements, contributing to the longevity and reliability of this iconic aircraft.

For More: What is PFIDS on Boeing 737? (Passenger Flight Information Display System)