AD 2018-11-04 Airworthiness Directives; Aircraft Industries a.s. Airplanes

Models named: L 410 UVP-E20, L 410 UVP-E20 CARGO. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to the following Aircraft Industries a.s. Models L 410 UVP-E20 and L 410 UVP-E20 CARGO airplanes, manufacturer serial numbers 2904 through 3114, that are: (1) Equipped with GE Aviation H80-200 engines and Avia Propeller AV 725 propellers; and (2) certificated in any category.

Unless already done, do the following actions. (1) Within the next 25 hours time-in-service (TIS) after the effective date of this AD or within the next 30 days after the effective date of this, whichever occurs first, modify the electrical testing circuit of the propeller pitch lock system following the Instructions for Implementation in LET Aircraft Industries Mandatory Bulletin MB No. L410UVP-E/143a, Revision 2, dated March 7, 2018. (2) Within the next 25 hours TIS after the effective date of this AD or within the next 30 days after the effective date of this, whichever occurs first, incorporate airplane flight manual (AFM) changes following the Measures specified in LET Aircraft Industries Documentation Bulletin DB No. L410UVP-E/268d, dated May 9, 2018. After incorporating the AFM changes, operate the airplane accordingly. (3) If any discrepancies are found during any pitch lock system pre-flight check required in the AFM changes specified in paragraph (f)(2) of this AD, before further flight, contact the manufacturer for FAA-approved repair instructions approved specifically for this AD. You may use the contact information found in paragraph (i)(3) of this AD.

The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, Small Airplane Standards Branch, 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: Doug Rudolph, Aerospace Engineer, FAA, Small Airplane Standards Branch, 901 Locust, Room 301, Kansas City, Missouri 64106; telephone: (816) 329-4059; fax: (816) 329-4090; email: doug.rudolph@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, the action must be accomplished using a method approved by the Manager, Small Airplane Standards Branch, FAA; or the European Aviation Safety Agency (EASA).

This AD was prompted by mandatory continuing airworthiness information (MCAI) issued by the aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as un-commanded negative thrust mode activated on an engine. We are issuing this AD to provide guidance to the flight crew in the event of un-commanded negative thrust mode activated on an engine, which could lead to loss of control.

None.