Dimension Anomalies Found That Could Affect Cooling Airflow
The FAA has issued a revised Special Airworthiness Information Bulletin (SAIB) to inform owners, operators, and certificated repair facilities of all CFM International CFM56-5, -5A1, -5A1/F, -5A3, -5A4, -5A4/F, -5A5, -5A5/F turbofan engines that non-type certificate holder-repaired low pressure turbine (LPT), stage 1 nozzle guide vanes (NGV), supplied by Chromalloy Gas Turbine, LLC (Chromalloy), are being removed from service due to dimensional anomalies that can affect the cooling airflow to the turbine.