EASA SIB NE-07-49R1: Lycoming Engines — Fuel Injector Tube Assembly Installation and Inspection

What to do

Operators and maintenance personnel should inspect the engine identification plate to determine the TCDS number and certification basis of their Lycoming engine. They must then consult the appropriate documents—either the ALS in the Maintenance and Overhaul Manual for FAR 33 certified engines or applicable ADs for CAR 13 certified engines—to perform mandatory inspections. Installers modifying fuel injector lines must ensure no damage or compromise to fuel system integrity occurs. No specific compliance deadlines are stated in the bulletin.

Summary

Lycoming Engines — Fuel Injector Tube Assembly Installation and Inspection is a Revised Special Airworthiness Information Bulletin (SAIB) issued by the FAA that addresses the installation and inspection requirements for fuel injector tube assemblies on Lycoming four, six, and eight cylinder reciprocating engines. It clarifies that mandatory inspections for these engines may be found in different documents depending on the engine's certification basis, either in Airworthiness Limitations Sections (ALS) for FAR 33 certified engines or in Airworthiness Directives (ADs) for CAR 13 certified engines.

What changed

This SAIB revises previous guidance by clarifying where mandatory inspections for fuel injector lines and clamps are documented based on the engine's certification basis. It emphasizes that newer FAR 33 certified Lycoming engines have mandatory inspections in the ALS of their Maintenance and Overhaul Manuals, while older CAR 13 certified engines rely on ADs such as AD 2015-19-07 and Lycoming Mandatory Service Bulletin No. 342G Supplement 1. It also highlights the responsibilities of installers to avoid compromising fuel system integrity.

Why it matters

This information is important for aviation professionals to ensure compliance with mandatory inspections and maintain engine airworthiness. Operators, maintenance organizations, and repair facilities must correctly identify the certification basis of their Lycoming engines to locate and perform required inspections. Proper installation and inspection of fuel injector lines prevent potential fuel system failures and ensure continued safe operation of affected engines.