Airworthiness directives › 2023-06-10
AD 2023-06-10 Airworthiness Directives; The Boeing Company Airplanes
Models named: 737-8, -8200, -9. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to all The Boeing Company Model 737-8, -8200, and -9 airplanes, certificated in any category.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
For airplanes with an original airworthiness certificate or original export certificate of airworthiness issued on or before the effective date of the AD: Except as specified by paragraph (h) of this AD, at the applicable times specified in the “Suggested Operator Action” section of Boeing Service Letter 737-SL-71-081-A, Revision A, dated March 3, 2023, do all applicable actions identified as “RC” (required for compliance) in, and in accordance with, the Work Instructions of Boeing Service Letter 737-SL-71-081-A, Revision A, dated March 3, 2023. Perform all applicable related investigative and corrective actions before further flight.
Unsafe condition
This AD was prompted by a report indicating that certain engine anti-ice (EAI) exhaust duct fasteners were inadequately torqued during installation at the factory. The FAA is issuing this AD to address loose or missing fasteners for the EAI exhaust duct that may allow EAI exhaust air to enter the inlet inner barrel causing heat damage that will compromise the structural integrity of the inlet, eventually leading to inlet failure and separation under normal flight loads. The unsafe condition, if not addressed, will lead to failure of the corresponding engine due to airflow disruption and ingestion of debris and likely failure and separation of the associated fan cowl. Damage to the engine and engine nacelle could result in a loss of engine thrust, increased nacelle drag, and disruption of airflow over the wing, which may excessively reduce the controllability and climb performance of the airplane; and damage from debris departing the engine and nacelle, which could impact the fuselage and empennage, could result in personal injury to passengers and loss of control of the airplane.
Affected ADs
None.
Read the original on the Federal Register →
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1