Engine – Turbocharger Waste Gate Controller and Control Rod Circlip – Life Limit
Superseded. Comply with 2018-0125, which replaces this document.
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must replace the waste gate controller and circlip within specified compliance times based on engine group classification, with recurring replacements every 250 flight hours. From 1 January 2018, installation of non spring loaded circlips is prohibited. Compliance must follow the instructions in Austro Engine Mandatory Service Bulletin MSB-E4-022 revision 2 or later.
Summary
EASA Airworthiness Directive 2017-0250 is an airworthiness directive issued by the European Union Aviation Safety Agency affecting Austro Engine GmbH E4 and E4P engines, commonly installed on Diamond Aircraft Industries DA 40 NG, DA 42 NG, DA 42 M-NG, and DA 62 aeroplanes. The directive addresses issues related to turbocharger waste gate controller and control rod circlip components. It mandates life limits and replacement procedures to ensure continued safe operation of these engines.
What changed
EASA Airworthiness Directive 2017-0250 introduces mandatory life limits for the turbocharger waste gate controller and the waste gate control rod circlip, specifically prohibiting the installation of non spring loaded circlips (Part Number DIN6799-5). It requires initial and recurring replacements of these parts according to specified flight hour or calendar time intervals to prevent failures.
Why it matters
This directive is critical for aviation professionals because failure of the turbocharger waste gate control rod or circlip can lead to engine power loss and reduced aircraft control, posing a safety risk. Operators and maintenance organizations must comply to ensure the reliability and airworthiness of affected engines, avoiding potential in-flight engine malfunctions.
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