Airworthiness Directive · Amendment 39-19292 · Propellers/propulsors
Aircraft Industries a.s. Airplanes
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.
We are adopting a new airworthiness directive (AD) for Aircraft Industries a.s. Models L 410 UVP-E20 and L 410 UVP-E20 CARGO airplanes. This AD results from 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 require actions to address the unsafe condition on these products.
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.
