EASA AD US-2023-06-10
Ice and Rain Protection / Powerplant - Engine Anti-Ice Exhaust Duct Fasteners - Inspection
Summary
Airworthiness Directive 2023-06-10 is a final rule issued by the Federal Aviation Administration addressing all Boeing 737-8, -8200, and -9 airplanes. It mandates inspections and corrective actions related to engine anti-ice (EAI) exhaust duct fasteners that were found to be inadequately torqued, potentially compromising engine inlet integrity. The directive also limits installation of affected parts to prevent unsafe conditions.
What Changed
This new airworthiness directive introduces mandatory inspections or records reviews to identify affected engine inlets by serial number. If affected parts are found, it requires detailed inspections of the EAI exhaust duct fasteners for proper torque and gap spacing, followed by corrective actions such as re-torquing, repairs, or part replacement. It also imposes limitations on installing certain parts to prevent recurrence of the issue.
Why It Matters
The directive addresses a critical safety risk where loose or missing EAI exhaust duct fasteners can cause heat damage and structural failure of the engine inlet, potentially leading to engine failure and loss of airplane control. Compliance is essential for operators and maintenance organizations to ensure continued airworthiness and passenger safety. It also helps prevent costly damage and operational disruptions caused by engine or nacelle failures.
What To Do
Operators must inspect or review maintenance records to determine the serial numbers of engine inlets and identify affected parts by April 11, 2023. If affected fasteners are found, they must perform inspections for torque and damage, carry out required repairs or replacements, and mark parts accordingly. Installation of affected parts is restricted, and comments on the directive must be submitted by May 11, 2023.
AI-generated summary from official EASA source document. Always verify against the original.