What is SPL on Boeing 777? (Splice List)

The Boeing 777 aircraft is one of the most iconic and widely used airplanes in the aviation industry. It is known for its reliability, efficiency, and advanced technology. One of the key components that contribute to the smooth operation of the Boeing 777 is the Splice List, abbreviated as SPL. In this article, we will delve into the details of what exactly the Splice List is and its significance in the functioning of the Boeing 777.

The Importance of Splice List in the Boeing 777

The Splice List plays a crucial role in ensuring the structural integrity of the Boeing 777 aircraft. It is essentially a detailed inventory of all the different types of splices present in the fuselage structure. A splice can be defined as a joint or connection between two or more structural elements, such as stringers or frames, in the aircraft fuselage.

Each splice on the Boeing 777 is carefully documented and listed in the Splice List, which serves as a comprehensive reference for maintenance and repair purposes. The Splice List includes information such as the location of each splice, the type of splice used, and any specific maintenance or inspection requirements associated with it. This helps the maintenance personnel in efficiently identifying and addressing any issues or concerns related to the splices.

The Splice List is an essential tool for both the manufacturer and the operators of the Boeing 777. During the manufacturing process, the Splice List guides the assembly team in accurately installing the splices at their designated locations. This ensures that the aircraft is built as per the approved design specifications, maintaining the structural integrity and strength required for safe operation.

For operators, the Splice List is an invaluable resource for maintenance and inspection activities. It provides them with critical information about the various splices installed in the aircraft, allowing them to assess their condition and perform necessary repairs or replacements when required. Regular inspections of the splices are vital to ensure that they remain in optimal condition and meet the regulatory requirements set by aviation authorities.

Additionally, the Splice List plays a significant role in the overall safety and certification process of the Boeing 777. During the certification process, the aircraft manufacturer must demonstrate the structural integrity of the aircraft and its components, including splices. The Splice List provides the necessary documentation and evidence to prove compliance with regulatory standards and ensure the airworthiness of the aircraft.

The Maintenance and Inspection of Boeing 777 Splices

The maintenance and inspection of the splices listed in the Boeing 777 Splice List require adherence to specific guidelines and procedures. The frequency and extent of the inspections depend on factors such as the age of the aircraft, the operating conditions, and any reported occurrences of issues related to the splices.

Typically, visual inspections are conducted to assess the condition of the splices. These inspections involve examining the exterior surfaces of the fuselage for any signs of damage, such as cracks or corrosion, which may indicate a problem with the splices. In some cases, non-destructive testing methods such as ultrasonic inspections may also be used to detect potential internal defects that are not visible to the naked eye.

If any issues or concerns are identified during the inspections, appropriate repair or replacement actions are undertaken as per the guidance provided in the Boeing 777 maintenance manuals. These actions are necessary to maintain the structural integrity of the aircraft and ensure its safe operation. Any repairs or replacements must be carried out by qualified personnel following approved procedures and using certified materials to meet the stringent aviation standards.


The Splice List, abbreviated as SPL, is an essential document for the Boeing 777 aircraft. It serves as a comprehensive inventory of all the different types of splices present in the aircraft’s fuselage structure. The Splice List plays a crucial role in ensuring the structural integrity, maintenance, and inspection of the splices. It guides the assembly process, aids in maintenance activities, and contributes to the safety and certification of the aircraft.

Operators and maintenance personnel rely on the Splice List to perform regular inspections, identify issues, and undertake necessary repairs or replacements. By adhering to the guidelines and procedures outlined in the Boeing 777 maintenance manuals, the splices listed in the Splice List can be effectively maintained and preserved for optimal performance and safety.

For More: What is HPSOV on Boeing 777? (High Pressure Shutoff Valve)