Engine - Cross-Flow Cylinder Assembly - Inspection / Modification / Replacement
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AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Affected operators must perform a visual inspection of the cross-flow cylinder assembly by the next maintenance event, which is within 50 engine operating hours if the engine has 500 or more hours at the AD effective date, or at the next 100-hour or annual inspection if below 500 hours. Based on inspection findings, modification or replacement of the assembly is required. Compliance with this AD is mandatory by September 21, 2020.
Summary
FAA Airworthiness Directive 2020-16-11 is a final rule addressing Continental Aerospace Technologies, Inc. reciprocating AvGas engines, including models GTSIO-520 series, IO-550 series, IOF-550 series, TSIO-520-BE, TSIO-550 series, and TSIOF-550 series, equipped with certain cross-flow cylinder assemblies. This directive responds to in-flight engine failures caused by fractured cross-flow cylinder assemblies. It mandates inspection and, if necessary, modification or replacement of these assemblies to ensure continued airworthiness.
What changed
This new airworthiness directive introduces mandatory visual inspections of specified cross-flow cylinder assemblies on affected Continental engines. Depending on inspection results, operators must modify or replace the assemblies to mitigate the risk of engine failure. The directive applies to engines with cross-flow cylinder assemblies installed on or after November 1, 2014, and lists specific part numbers subject to inspection.
Why it matters
This directive is critical for aviation professionals as it addresses a safety risk that could lead to in-flight engine failures. Operators and maintenance organizations must ensure compliance to prevent potential accidents and maintain regulatory adherence. Timely inspections and corrective actions help sustain engine reliability and aircraft safety.
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