AD 2023-06-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Inadequately torqued fasteners for engine anti-ice (EAI) exhaust ducts may loosen over time due to engine vibration, eventually causing the fastener to drop into the inlet inner barrel. This could allow EAI exhaust air to escape from the EAI exhaust duct via two scenarios: excessive vibration leading to fatigue cracking of the EAI exhaust duct, or escaping air impinging directly on the inner barrel structure, causing heat damage and compromising the structural integrity of the inlet.
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Required Actions
Inspect the EAI exhaust duct fasteners to determine the gap spacing and if all fasteners are installed, applicable related investigative and corrective actions, and part marking. Investigative actions include inspecting fasteners for proper torque, general visual and high frequency eddy current inspections of the EAI exhaust duct flange and fastener holes for cracking, and visual inspections of the inner barrel for thermal exposure. Corrective actions include re-torquing fasteners, repairing or replacing EAI exhaust ducts, repairing thermal exposure, and replacing the engine inlet.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
The Boeing Company Model 737-8, -8200, and -9 airplanes with an original airworthiness certificate or original export certificate of airworthiness issued on or before April 11, 2023.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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