AD 2017-01-12 Airworthiness Directives; Diamond Aircraft Industries GmbH Airplanes

Makes named: diamond, technify. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to Diamond Aircraft Industries GmbH DA 42 airplanes, serial numbers 42.004 through 42.427 and 42.AC001 through 42.AC151, that have a TAE 125-02-99 or TAE 125-02-114 engine installed, are equipped with an exhaust pipe, DAI part number (P/N) D60-9078-06-01, or Technify P/Ns 52-7810-H0001 02, 52-7810-H0001 03, or 52-7810-H0001 04, and are certificated in any category.

Unless already done, do one of the actions in either paragraph (f)(1) or (2) of this AD. For the purpose of this AD, if the flight hours accumulated since first installation of an affected exhaust pipe is not known, use the total hours time-in-service (TIS) accumulated on the airplane. Note 1 to paragraph (f) of this AD: The NPRM for this AD proposed to require both the installation of clamps and the replacement of the exhaust pipes. This AD only requires one or the other. (1) At the following compliance times, install additional exhaust pipe clamps following section III.2 of the INSTRUCTIONS section of Diamond Aircraft Industries GmbH Work Instruction WI-MSB 42-120, dated June 24, 2016, as specified in the Accomplishments/Instructions paragraph of Diamond Aircraft Industries GmbH Mandatory Service Bulletin MSB 42-120, dated June 24, 2016, or Diamond Aircraft Industries GmbH Mandatory Service Bulletin MSB 42-120/1, dated November 10, 2016. (i) If the affected exhaust pipe has 1,300 hours TIS or less since first installed on an airplane as of February 22, 2017 (the effective date of this AD): Before or upon accumulating 1,500 hours TIS since the affected exhaust pipe was first installed on an airplane. (ii) If the affected exhaust pipe has more than 1,300 hours TIS since first installed on an airplane as of February 22, 2017 (the effective date of this AD): Within the next 200 hours TIS after February 22, 2017 (the effective date of this AD) or within the next 12 months after February 22, 2017 (the effective date of this AD), whichever occurs first. (2) At the following compliance times, replace the exhaust pipes listed in paragraph (c) of this AD with an exhaust pipe DAI P/N D60-9078-06-01_01 or Technify P/N 52-7810-H0014 01 following section III.1 of the INSTRUCTIONS section of Diamond Aircraft Industries GmbH Work Instruction WI-MSB 42-120, dated June 24, 2016, as specified in the Accomplishments/Instructions paragraph of Diamond Aircraft Industries GmbH Mandatory Service Bulletin MSB 42-120, dated June 24, 2016, or Diamond Aircraft Industries GmbH Mandatory Service Bulletin MSB 42-120/1, dated November 10, 2016. (i) If the affected exhaust pipe has 1,300 hours TIS or less since first installed on an airplane as of February 22, 2017 (the effective date of this AD): Before or upon accumulating 1,500 hours TIS since the affected exhaust pipe was first installed on an airplane. (ii) If the affected exhaust pipe has more than 1,300 hours TIS since first installed on an airplane as of February 22, 2017 (the effective date of this AD): Within the next 200 hours TIS after February 22, 2017 (the effective date of this AD) or within the next 12 months after February 22, 2017 (the effective date of this AD), whichever occurs first.

The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, Standards Office, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Send information to ATTN: Mike Kiesov, Aerospace Engineer, FAA, Small Airplane Directorate, 901 Locust, Room 301, Kansas City, Missouri 64106; telephone: (816) 329-4144; fax: (816) 329-4090; email: mike.kiesov@faa.gov. Before using any approved AMOC on any airplane to which the AMOC applies, notify your appropriate principal inspector (PI) in the FAA Flight Standards District Office (FSDO), or lacking a PI, your local FSDO. (2) Airworthy Product: For any requirement in this AD to obtain corrective actions from a manufacturer or other source, use these actions if they are FAA-approved. Corrective actions are considered FAA-approved if they are approved by the State of Design Authority (or their delegated agent). You are required to assure the product is airworthy before it is returned to service. (3) Reporting Requirements: For any reporting requirement in this AD, a federal agency may not conduct or sponsor, and a person is not required to respond to, nor shall a person be subject to a penalty for failure to comply with a collection of information subject to the requirements of the Paperwork Reduction Act unless that collection of information displays a current valid OMB Control Number. The OMB Control Number for this information collection is 2120-0056. Public reporting for this collection of information is estimated to be approximately 5 minutes per response, including the time for reviewing instructions, completing and reviewing the collection of information. All responses to this collection of information are mandatory. Comments concerning the accuracy of this burden and suggestions for reducing the burden should be directed to the FAA at: 800 Independence Ave. SW., Washington, DC 20591, Attn: Information Collection Clearance Officer, AES-200.

This AD was prompted by mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as an uncommanded engine shutdown during flight due to failure of the propeller regulating valve caused by hot exhaust gases escaping from fractured engine exhaust pipes. We are issuing this AD to prevent failure of the propeller regulating valve, which could result in forced landing with consequent damage to the airplane.

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