Airworthiness directives › 2018-18-02
AD 2018-18-02 Airworthiness Directives; Austro Engine GmbH Engines
Makes named: austro. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Austro Engine GmbH model E4 engines with serial numbers that have a “-B” or “-C” configuration and to model E4P engines, all serial numbers.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Determine whether the engine is a Group 1 or Group 2 engine as follows. (i) A Group 1 engine is an engine equipped with a timing chain that was installed on an engine that experienced a windmill restart, or an engine in which it cannot be determined if the engine experienced any windmilling restarts. (ii) A Group 2 engine is an engine that is equipped with a timing chain that has not experienced any windmilling restarts. (2) For Group 1 engines: Before the affected timing chain exceeds 945 engine flight hours (EFHs) since installation on an engine, or within 110 EFHs after the effective date of this AD, whichever occurs later, replace the timing chain in accordance with the instructions in Technical Details, paragraph 2, in Austro Engine Mandatory Service Bulletin (MSB) No. MSB-E4-017/2, Revision 2, dated December 2, 2016. (3) For Group 1 and Group 2 engines: After the effective date of this AD, following each windmill restart of an engine, before the timing chain of that engine exceeds 945 EFHs since first installation on an engine, or within 110 EFHs after that windmilling restart, whichever occurs later, replace the timing chain in accordance with the instructions in Technical Details, paragraph 2, in Austro Engine MSB No. MSB-E4-017/2, Revision 2, dated December 2, 2016. (4) For Group 1 and Group 2 engines: Within 30 days after the effective date of this AD, amend the applicable airplane flight manual under emergency procedures by adding the information in figure 1 to paragraph (g)(4) of this AD to limit the use of a windmilling restart to only an emergency procedure. ER25OC18.000 (5) For affected Austro Engine GmbH model E4 engines installed on Diamond Aircraft Industries (DAI) model DA 42 NG and DA 42 M-NG airplanes and for Austro Engine GbmH model E4P engines installed on DAI model DA 62 airplanes, using Airplane Flight Manual (AFM) Temporary Revision (TR) TR-MÄM-42-973, and AFM TR TR-MÄM-62-240, both dated August 12, 2016, respectively, to update the applicable AFM is an acceptable method to comply with paragraph (g)(4) of this AD.
Unsafe condition
This AD was prompted by reports of considerable wear on the timing chain on these engines. We are issuing this AD to prevent failure of the engine timing chain. The unsafe condition, if not addressed, could result in failure of the engine timing chain, loss of engine thrust control, and reduced control of the airplane.
Affected ADs
None.
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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